drm/nouveau/volt: convert to new-style nvkm_subdev

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

12 files changed, 161 insertions, 253 deletions

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h
index dc8846899a60..5c8a3f1196de 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h
@@ -2,20 +2,10 @@
 #define __NVKM_VOLT_H__
 #include <core/subdev.h>
 
-struct nvkm_voltage {
-	u32 uv;
-	u8  id;
-};
-
 struct nvkm_volt {
+	const struct nvkm_volt_func *func;
 	struct nvkm_subdev subdev;
 
-	int (*vid_get)(struct nvkm_volt *);
-	int (*get)(struct nvkm_volt *);
-	int (*vid_set)(struct nvkm_volt *, u8 vid);
-	int (*set)(struct nvkm_volt *, u32 uv);
-	int (*set_id)(struct nvkm_volt *, u8 id, int condition);
-
 	u8 vid_mask;
 	u8 vid_nr;
 	struct {
@@ -24,35 +14,9 @@ struct nvkm_volt {
 	} vid[256];
 };
 
-static inline struct nvkm_volt *
-nvkm_volt(void *obj)
-{
-	return (void *)nvkm_subdev(obj, NVDEV_SUBDEV_VOLT);
-}
-
-#define nvkm_volt_create(p, e, o, d)                                        \
-	nvkm_volt_create_((p), (e), (o), sizeof(**d), (void **)d)
-#define nvkm_volt_destroy(p) ({                                             \
-	struct nvkm_volt *v = (p);                                          \
-	_nvkm_volt_dtor(nv_object(v));                                      \
-})
-#define nvkm_volt_init(p) ({                                                \
-	struct nvkm_volt *v = (p);                                          \
-	_nvkm_volt_init(nv_object(v));                                      \
-})
-#define nvkm_volt_fini(p,s)                                                 \
-	nvkm_subdev_fini_old((p), (s))
-
-int  nvkm_volt_create_(struct nvkm_object *, struct nvkm_object *,
-			  struct nvkm_oclass *, int, void **);
-void _nvkm_volt_dtor(struct nvkm_object *);
-int  _nvkm_volt_init(struct nvkm_object *);
-#define _nvkm_volt_fini _nvkm_subdev_fini
-
-extern struct nvkm_oclass nv40_volt_oclass;
-extern struct nvkm_oclass gk20a_volt_oclass;
+int nvkm_volt_get(struct nvkm_volt *);
+int nvkm_volt_set_id(struct nvkm_volt *, u8 id, int condition);
 
-int nvkm_voltgpio_init(struct nvkm_volt *);
-int nvkm_voltgpio_get(struct nvkm_volt *);
-int nvkm_voltgpio_set(struct nvkm_volt *, u8);
+int nv40_volt_new(struct nvkm_device *, int, struct nvkm_volt **);
+int gk20a_volt_new(struct nvkm_device *, int, struct nvkm_volt **);
 #endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
index 04895322d371..7f858efb2c44 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
@@ -465,7 +465,7 @@ nv40_chipset = {
 	.mmu = nv04_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv40_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -490,7 +490,7 @@ nv41_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -515,7 +515,7 @@ nv42_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -540,7 +540,7 @@ nv43_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -565,7 +565,7 @@ nv44_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -590,7 +590,7 @@ nv45_chipset = {
 	.mmu = nv04_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -615,7 +615,7 @@ nv46_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -640,7 +640,7 @@ nv47_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -665,7 +665,7 @@ nv49_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -690,7 +690,7 @@ nv4a_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -715,7 +715,7 @@ nv4b_chipset = {
 	.mmu = nv41_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -740,7 +740,7 @@ nv4c_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -765,7 +765,7 @@ nv4e_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -793,7 +793,7 @@ nv50_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = nv50_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv50_disp_new,
 //	.dma = nv50_dma_new,
 //	.fifo = nv50_fifo_new,
@@ -818,7 +818,7 @@ nv63_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -843,7 +843,7 @@ nv67_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -868,7 +868,7 @@ nv68_chipset = {
 	.mmu = nv44_mmu_new,
 	.therm = nv40_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = nv04_disp_new,
 //	.dma = nv04_dma_new,
 //	.fifo = nv40_fifo_new,
@@ -896,7 +896,7 @@ nv84_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.bsp = g84_bsp_new,
 //	.cipher = g84_cipher_new,
 //	.disp = g84_disp_new,
@@ -927,7 +927,7 @@ nv86_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.bsp = g84_bsp_new,
 //	.cipher = g84_cipher_new,
 //	.disp = g84_disp_new,
@@ -958,7 +958,7 @@ nv92_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.bsp = g84_bsp_new,
 //	.cipher = g84_cipher_new,
 //	.disp = g84_disp_new,
@@ -989,7 +989,7 @@ nv94_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.bsp = g84_bsp_new,
 //	.cipher = g84_cipher_new,
 //	.disp = g94_disp_new,
@@ -1020,7 +1020,7 @@ nv96_chipset = {
 	.imem = nv50_instmem_new,
 	.mmu = nv50_mmu_new,
 	.bar = g84_bar_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.dma = nv50_dma_new,
 //	.fifo = g84_fifo_new,
 //	.sw = nv50_sw_new,
@@ -1051,7 +1051,7 @@ nv98_chipset = {
 	.imem = nv50_instmem_new,
 	.mmu = nv50_mmu_new,
 	.bar = g84_bar_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.dma = nv50_dma_new,
 //	.fifo = g84_fifo_new,
 //	.sw = nv50_sw_new,
@@ -1082,7 +1082,7 @@ nva0_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.bsp = g84_bsp_new,
 //	.cipher = g84_cipher_new,
 //	.disp = gt200_disp_new,
@@ -1114,7 +1114,7 @@ nva3_chipset = {
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gt215_ce_new,
 //	.disp = gt215_disp_new,
 //	.dma = nv50_dma_new,
@@ -1147,7 +1147,7 @@ nva5_chipset = {
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gt215_ce_new,
 //	.disp = gt215_disp_new,
 //	.dma = nv50_dma_new,
@@ -1179,7 +1179,7 @@ nva8_chipset = {
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gt215_ce_new,
 //	.disp = gt215_disp_new,
 //	.dma = nv50_dma_new,
@@ -1210,7 +1210,7 @@ nvaa_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = g94_disp_new,
 //	.dma = nv50_dma_new,
 //	.fifo = g84_fifo_new,
@@ -1241,7 +1241,7 @@ nvac_chipset = {
 	.mxm = nv50_mxm_new,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.disp = g94_disp_new,
 //	.dma = nv50_dma_new,
 //	.fifo = g84_fifo_new,
@@ -1273,7 +1273,7 @@ nvaf_chipset = {
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gt215_ce_new,
 //	.disp = gt215_disp_new,
 //	.dma = nv50_dma_new,
@@ -1307,7 +1307,7 @@ nvc0_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.ce[1] = gf100_ce1_new,
 //	.disp = gt215_disp_new,
@@ -1342,7 +1342,7 @@ nvc1_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.disp = gt215_disp_new,
 //	.dma = gf100_dma_new,
@@ -1376,7 +1376,7 @@ nvc3_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.disp = gt215_disp_new,
 //	.dma = gf100_dma_new,
@@ -1410,7 +1410,7 @@ nvc4_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.ce[1] = gf100_ce1_new,
 //	.disp = gt215_disp_new,
@@ -1445,7 +1445,7 @@ nvc8_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.ce[1] = gf100_ce1_new,
 //	.disp = gt215_disp_new,
@@ -1480,7 +1480,7 @@ nvce_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.ce[1] = gf100_ce1_new,
 //	.disp = gt215_disp_new,
@@ -1515,7 +1515,7 @@ nvcf_chipset = {
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.disp = gt215_disp_new,
 //	.dma = gf100_dma_new,
@@ -1581,7 +1581,7 @@ nvd9_chipset = {
 	.pmu = gf119_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gf100_ce0_new,
 //	.disp = gf119_disp_new,
 //	.dma = gf119_dma_new,
@@ -1615,7 +1615,7 @@ nve4_chipset = {
 	.pmu = gk104_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1651,7 +1651,7 @@ nve6_chipset = {
 	.pmu = gk104_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1687,7 +1687,7 @@ nve7_chipset = {
 	.pmu = gf119_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1717,7 +1717,7 @@ nvea_chipset = {
 	.mmu = gf100_mmu_new,
 	.pmu = gk20a_pmu_new,
 	.timer = gk20a_timer_new,
-//	.volt = gk20a_volt_new,
+	.volt = gk20a_volt_new,
 //	.ce[2] = gk104_ce2_new,
 //	.dma = gf119_dma_new,
 //	.fifo = gk20a_fifo_new,
@@ -1747,7 +1747,7 @@ nvf0_chipset = {
 	.pmu = gk110_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1783,7 +1783,7 @@ nvf1_chipset = {
 	.pmu = gk110_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1819,7 +1819,7 @@ nv106_chipset = {
 	.pmu = gk208_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
@@ -1854,7 +1854,7 @@ nv108_chipset = {
 	.pmu = gk208_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
-//	.volt = nv40_volt_new,
+	.volt = nv40_volt_new,
 //	.ce[0] = gk104_ce0_new,
 //	.ce[1] = gk104_ce1_new,
 //	.ce[2] = gk104_ce2_new,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/gf100.c
index 28421e6f1f26..1f273e108618 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/gf100.c
@@ -28,7 +28,6 @@ gf100_identify(struct nvkm_device *device)
 {
 	switch (device->chipset) {
 	case 0xc0:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -42,7 +41,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xc4:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -56,7 +54,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xc3:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -69,7 +66,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xce:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -83,7 +79,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xcf:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -96,7 +91,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xc1:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -109,7 +103,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf108_pm_oclass;
 		break;
 	case 0xc8:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf100_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -123,7 +116,6 @@ gf100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gf100_pm_oclass;
 		break;
 	case 0xd9:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gf100_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/gk104.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/gk104.c
index 25d9092455aa..414ff61873b9 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/gk104.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/gk104.c
@@ -28,7 +28,6 @@ gk104_identify(struct nvkm_device *device)
 {
 	switch (device->chipset) {
 	case 0xe4:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk104_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -43,7 +42,6 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gk104_pm_oclass;
 		break;
 	case 0xe7:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk104_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -58,7 +56,6 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = gk104_pm_oclass;
 		break;
 	case 0xe6:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk104_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -79,10 +76,8 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_GR     ] =  gk20a_gr_oclass;
 		device->oclass[NVDEV_ENGINE_CE2    ] = &gk104_ce2_oclass;
 		device->oclass[NVDEV_ENGINE_PM     ] = gk104_pm_oclass;
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &gk20a_volt_oclass;
 		break;
 	case 0xf0:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk104_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -97,7 +92,6 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = &gk110_pm_oclass;
 		break;
 	case 0xf1:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk104_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -112,7 +106,6 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] = &gk110_pm_oclass;
 		break;
 	case 0x106:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk208_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
@@ -126,7 +119,6 @@ gk104_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_MSPPP  ] = &gf100_msppp_oclass;
 		break;
 	case 0x108:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk208_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
index 4b570a27e13a..c16d9586708b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
@@ -30,7 +30,6 @@ gm100_identify(struct nvkm_device *device)
 	case 0x117:
 
 #if 0
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 #endif
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gk208_fifo_oclass;
@@ -54,7 +53,6 @@ gm100_identify(struct nvkm_device *device)
 		/* priv ring says no to 0x10eb14 writes */
 #endif
 #if 0
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 #endif
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gm204_fifo_oclass;
@@ -76,7 +74,6 @@ gm100_identify(struct nvkm_device *device)
 		/* priv ring says no to 0x10eb14 writes */
 #endif
 #if 0
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 #endif
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gm204_fifo_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/nv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/nv40.c
index 31df1b8ae705..0d6da9716b7b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/nv40.c
@@ -28,7 +28,6 @@ nv40_identify(struct nvkm_device *device)
 {
 	switch (device->chipset) {
 	case 0x40:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -38,7 +37,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x41:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -48,7 +46,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x42:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -58,7 +55,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x43:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -68,7 +64,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x45:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -78,7 +73,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x47:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -88,7 +82,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x49:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -98,7 +91,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x4b:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -108,7 +100,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x44:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -118,7 +109,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x46:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -128,7 +118,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x4a:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -138,7 +127,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x4c:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -148,7 +136,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x4e:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -158,7 +145,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x63:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -168,7 +154,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x67:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
@@ -178,7 +163,6 @@ nv40_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv40_pm_oclass;
 		break;
 	case 0x68:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv04_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv40_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv10_sw_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c
index e01add48ceb3..7e2a4a93b2a7 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c
@@ -28,7 +28,6 @@ nv50_identify(struct nvkm_device *device)
 {
 	switch (device->chipset) {
 	case 0x50:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  nv50_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -38,7 +37,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  nv50_pm_oclass;
 		break;
 	case 0x84:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -51,7 +49,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0x86:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -64,7 +61,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0x92:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -77,7 +73,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0x94:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -90,7 +85,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0x96:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -103,7 +97,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0x98:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -116,7 +109,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0xa0:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -129,7 +121,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  gt200_pm_oclass;
 		break;
 	case 0xaa:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -142,7 +133,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0xac:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -155,7 +145,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  g84_pm_oclass;
 		break;
 	case 0xa3:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -169,7 +158,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  gt215_pm_oclass;
 		break;
 	case 0xa5:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -182,7 +170,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  gt215_pm_oclass;
 		break;
 	case 0xa8:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
@@ -195,7 +182,6 @@ nv50_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_PM     ] =  gt215_pm_oclass;
 		break;
 	case 0xaf:
-		device->oclass[NVDEV_SUBDEV_VOLT   ] = &nv40_volt_oclass;
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  nv50_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  g84_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  nv50_sw_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
index cdb87e2900f1..dc8682c91cc7 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
@@ -99,7 +99,7 @@ nvkm_cstate_prog(struct nvkm_clk *clk, struct nvkm_pstate *pstate, int cstatei)
 	}
 
 	if (volt) {
-		ret = volt->set_id(volt, cstate->voltage, +1);
+		ret = nvkm_volt_set_id(volt, cstate->voltage, +1);
 		if (ret && ret != -ENODEV) {
 			nvkm_error(subdev, "failed to raise voltage: %d\n", ret);
 			return ret;
@@ -113,7 +113,7 @@ nvkm_cstate_prog(struct nvkm_clk *clk, struct nvkm_pstate *pstate, int cstatei)
 	}
 
 	if (volt) {
-		ret = volt->set_id(volt, cstate->voltage, -1);
+		ret = nvkm_volt_set_id(volt, cstate->voltage, -1);
 		if (ret && ret != -ENODEV)
 			nvkm_error(subdev, "failed to lower voltage: %d\n", ret);
 	}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
index c1668c86f521..4752dbd33923 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
@@ -21,44 +21,39 @@
  *
  * Authors: Ben Skeggs
  */
-#include <subdev/volt.h>
+#include "priv.h"
+
 #include <subdev/bios.h>
 #include <subdev/bios/vmap.h>
 #include <subdev/bios/volt.h>
 
-static int
+int
 nvkm_volt_get(struct nvkm_volt *volt)
 {
-	if (volt->vid_get) {
-		int ret = volt->vid_get(volt), i;
-		if (ret >= 0) {
-			for (i = 0; i < volt->vid_nr; i++) {
-				if (volt->vid[i].vid == ret)
-					return volt->vid[i].uv;
-			}
-			ret = -EINVAL;
+	int ret = volt->func->vid_get(volt), i;
+	if (ret >= 0) {
+		for (i = 0; i < volt->vid_nr; i++) {
+			if (volt->vid[i].vid == ret)
+				return volt->vid[i].uv;
 		}
-		return ret;
+		ret = -EINVAL;
 	}
-	return -ENODEV;
+	return ret;
 }
 
 static int
 nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
 {
 	struct nvkm_subdev *subdev = &volt->subdev;
-	if (volt->vid_set) {
-		int i, ret = -EINVAL;
-		for (i = 0; i < volt->vid_nr; i++) {
-			if (volt->vid[i].uv == uv) {
-				ret = volt->vid_set(volt, volt->vid[i].vid);
-				nvkm_debug(subdev, "set %duv: %d\n", uv, ret);
-				break;
-			}
+	int i, ret = -EINVAL;
+	for (i = 0; i < volt->vid_nr; i++) {
+		if (volt->vid[i].uv == uv) {
+			ret = volt->func->vid_set(volt, volt->vid[i].vid);
+			nvkm_debug(subdev, "set %duv: %d\n", uv, ret);
+			break;
 		}
-		return ret;
 	}
-	return -ENODEV;
+	return ret;
 }
 
 static int
@@ -83,10 +78,15 @@ nvkm_volt_map(struct nvkm_volt *volt, u8 id)
 	return id ? id * 10000 : -ENODEV;
 }
 
-static int
+int
 nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition)
 {
-	int ret = nvkm_volt_map(volt, id);
+	int ret;
+
+	if (volt->func->set_id)
+		return volt->func->set_id(volt, id, condition);
+
+	ret = nvkm_volt_map(volt, id);
 	if (ret >= 0) {
 		int prev = nvkm_volt_get(volt);
 		if (!condition || prev < 0 ||
@@ -135,53 +135,41 @@ nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
 	}
 }
 
-int
-_nvkm_volt_init(struct nvkm_object *object)
+static int
+nvkm_volt_init(struct nvkm_subdev *subdev)
 {
-	struct nvkm_volt *volt = (void *)object;
-	struct nvkm_subdev *subdev = &volt->subdev;
-	int ret;
-
-	ret = nvkm_subdev_init_old(&volt->subdev);
-	if (ret)
-		return ret;
-
-	ret = volt->get(volt);
+	struct nvkm_volt *volt = nvkm_volt(subdev);
+	int ret = nvkm_volt_get(volt);
 	if (ret < 0) {
 		if (ret != -ENODEV)
 			nvkm_debug(subdev, "current voltage unknown\n");
 		return 0;
 	}
-
 	nvkm_debug(subdev, "current voltage: %duv\n", ret);
 	return 0;
 }
 
-void
-_nvkm_volt_dtor(struct nvkm_object *object)
+static void *
+nvkm_volt_dtor(struct nvkm_subdev *subdev)
 {
-	struct nvkm_volt *volt = (void *)object;
-	nvkm_subdev_destroy(&volt->subdev);
+	return nvkm_volt(subdev);
 }
 
-int
-nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine,
-		  struct nvkm_oclass *oclass, int length, void **pobject)
+static const struct nvkm_subdev_func
+nvkm_volt = {
+	.dtor = nvkm_volt_dtor,
+	.init = nvkm_volt_init,
+};
+
+void
+nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,
+	       int index, struct nvkm_volt *volt)
 {
-	struct nvkm_device *device = (void *)parent;
 	struct nvkm_bios *bios = device->bios;
-	struct nvkm_volt *volt;
-	int ret, i;
-
-	ret = nvkm_subdev_create_(parent, engine, oclass, 0, "VOLT",
-				  "voltage", length, pobject);
-	volt = *pobject;
-	if (ret)
-		return ret;
+	int i;
 
-	volt->get = nvkm_volt_get;
-	volt->set = nvkm_volt_set;
-	volt->set_id = nvkm_volt_set_id;
+	nvkm_subdev_ctor(&nvkm_volt, device, index, 0, &volt->subdev);
+	volt->func = func;
 
 	/* Assuming the non-bios device should build the voltage table later */
 	if (bios)
@@ -192,16 +180,15 @@ nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 			nvkm_debug(&volt->subdev, "VID %02x: %duv\n",
 				   volt->vid[i].vid, volt->vid[i].uv);
 		}
-
-		/*XXX: this is an assumption.. there probably exists boards
-		 * out there with i2c-connected voltage controllers too..
-		 */
-		ret = nvkm_voltgpio_init(volt);
-		if (ret == 0) {
-			volt->vid_get = nvkm_voltgpio_get;
-			volt->vid_set = nvkm_voltgpio_set;
-		}
 	}
+}
 
-	return ret;
+int
+nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device,
+	       int index, struct nvkm_volt **pvolt)
+{
+	if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL)))
+		return -ENOMEM;
+	nvkm_volt_ctor(func, device, index, *pvolt);
+	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c
index 59fa2cf898d2..01394a05e9d8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c
@@ -19,7 +19,9 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
-#include <subdev/volt.h>
+#define gk20a_volt(p) container_of((p), struct gk20a_volt, base)
+#include "priv.h"
+
 #ifdef __KERNEL__
 #include <nouveau_platform.h>
 #endif
@@ -101,9 +103,9 @@ gk20a_volt_calc_voltage(const struct cvb_coef *coef, int speedo)
 }
 
 static int
-gk20a_volt_vid_get(struct nvkm_volt *obj)
+gk20a_volt_vid_get(struct nvkm_volt *base)
 {
-	struct gk20a_volt *volt = container_of(obj, typeof(*volt), base);
+	struct gk20a_volt *volt = gk20a_volt(base);
 	int i, uv;
 
 	uv = regulator_get_voltage(volt->vdd);
@@ -116,9 +118,9 @@ gk20a_volt_vid_get(struct nvkm_volt *obj)
 }
 
 static int
-gk20a_volt_vid_set(struct nvkm_volt *obj, u8 vid)
+gk20a_volt_vid_set(struct nvkm_volt *base, u8 vid)
 {
-	struct gk20a_volt *volt = container_of(obj, typeof(*volt), base);
+	struct gk20a_volt *volt = gk20a_volt(base);
 	struct nvkm_subdev *subdev = &volt->base.subdev;
 
 	nvkm_debug(subdev, "set voltage as %duv\n", volt->base.vid[vid].uv);
@@ -126,9 +128,9 @@ gk20a_volt_vid_set(struct nvkm_volt *obj, u8 vid)
 }
 
 static int
-gk20a_volt_set_id(struct nvkm_volt *obj, u8 id, int condition)
+gk20a_volt_set_id(struct nvkm_volt *base, u8 id, int condition)
 {
-	struct gk20a_volt *volt = container_of(obj, typeof(*volt), base);
+	struct gk20a_volt *volt = gk20a_volt(base);
 	struct nvkm_subdev *subdev = &volt->base.subdev;
 	int prev_uv = regulator_get_voltage(volt->vdd);
 	int target_uv = volt->base.vid[id].uv;
@@ -147,27 +149,29 @@ gk20a_volt_set_id(struct nvkm_volt *obj, u8 id, int condition)
 	return ret;
 }
 
-static int
-gk20a_volt_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		struct nvkm_oclass *oclass, void *data, u32 size,
-		struct nvkm_object **pobject)
+static const struct nvkm_volt_func
+gk20a_volt = {
+	.vid_get = gk20a_volt_vid_get,
+	.vid_set = gk20a_volt_vid_set,
+	.set_id = gk20a_volt_set_id,
+};
+
+int
+gk20a_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
 {
-	struct nvkm_device *device = (void *)parent;
 	struct gk20a_volt *volt;
-	int i, ret, uv;
+	int i, uv;
+
+	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
+		return -ENOMEM;
 
-	ret = nvkm_volt_create(parent, engine, oclass, &volt);
-	*pobject = nv_object(volt);
-	if (ret)
-		return ret;
+	nvkm_volt_ctor(&gk20a_volt, device, index, &volt->base);
+	*pvolt = &volt->base;
 
 	uv = regulator_get_voltage(device->gpu->vdd);
 	nvkm_info(&volt->base.subdev, "The default voltage is %duV\n", uv);
 
 	volt->vdd = device->gpu->vdd;
-	volt->base.vid_get = gk20a_volt_vid_get;
-	volt->base.vid_set = gk20a_volt_vid_set;
-	volt->base.set_id = gk20a_volt_set_id;
 
 	volt->base.vid_nr = ARRAY_SIZE(gk20a_cvb_coef);
 	nvkm_debug(&volt->base.subdev, "%s - vid_nr = %d\n", __func__,
@@ -183,14 +187,3 @@ gk20a_volt_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 
 	return 0;
 }
-
-struct nvkm_oclass
-gk20a_volt_oclass = {
-	.handle = NV_SUBDEV(VOLT, 0xea),
-	.ofuncs = &(struct nvkm_ofuncs) {
-		.ctor = gk20a_volt_ctor,
-		.dtor = _nvkm_volt_dtor,
-		.init = _nvkm_volt_init,
-		.fini = _nvkm_volt_fini,
-	},
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/nv40.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/nv40.c
index 16e8965c72f9..23409387abb5 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/nv40.c
@@ -21,31 +21,24 @@
  *
  * Authors: Ben Skeggs
  */
-#include <subdev/volt.h>
+#include "priv.h"
 
-static int
-nv40_volt_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-	       struct nvkm_oclass *oclass, void *data, u32 size,
-	       struct nvkm_object **pobject)
+static const struct nvkm_volt_func
+nv40_volt = {
+	.vid_get = nvkm_voltgpio_get,
+	.vid_set = nvkm_voltgpio_set,
+};
+
+int
+nv40_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
 {
 	struct nvkm_volt *volt;
 	int ret;
 
-	ret = nvkm_volt_create(parent, engine, oclass, &volt);
-	*pobject = nv_object(volt);
+	ret = nvkm_volt_new_(&nv40_volt, device, index, &volt);
+	*pvolt = volt;
 	if (ret)
 		return ret;
 
-	return 0;
+	return nvkm_voltgpio_init(volt);
 }
-
-struct nvkm_oclass
-nv40_volt_oclass = {
-	.handle = NV_SUBDEV(VOLT, 0x40),
-	.ofuncs = &(struct nvkm_ofuncs) {
-		.ctor = nv40_volt_ctor,
-		.dtor = _nvkm_volt_dtor,
-		.init = _nvkm_volt_init,
-		.fini = _nvkm_volt_fini,
-	},
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/priv.h
new file mode 100644
index 000000000000..394f37c723af
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/priv.h
@@ -0,0 +1,20 @@
+#ifndef __NVKM_VOLT_PRIV_H__
+#define __NVKM_VOLT_PRIV_H__
+#define nvkm_volt(p) container_of((p), struct nvkm_volt, subdev)
+#include <subdev/volt.h>
+
+void nvkm_volt_ctor(const struct nvkm_volt_func *, struct nvkm_device *,
+		    int index, struct nvkm_volt *);
+int nvkm_volt_new_(const struct nvkm_volt_func *, struct nvkm_device *,
+		   int index, struct nvkm_volt **);
+
+struct nvkm_volt_func {
+	int (*vid_get)(struct nvkm_volt *);
+	int (*vid_set)(struct nvkm_volt *, u8 vid);
+	int (*set_id)(struct nvkm_volt *, u8 id, int condition);
+};
+
+int nvkm_voltgpio_init(struct nvkm_volt *);
+int nvkm_voltgpio_get(struct nvkm_volt *);
+int nvkm_voltgpio_set(struct nvkm_volt *, u8);
+#endif