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authorDenis 'GNUtoo' Carikli <GNUtoo@no-log.org>2012-07-09 21:39:12 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2012-07-10 19:23:03 +0200
commitd2a37b3d91f46da25e7ff34f582e914a4cc0bfee (patch)
treeb26ef7571c8c56df62f3cf25931063d7e8af6b8c /arch/arm/mach-imx
parent5349f2a89e6a31c8d39c4ec2618b9dd6e421c415 (diff)
ARM i.MX31: Add devicetree support
This patch adds basic devicetree support for i.MX31 based SoCs. Only the UART and interrupts bindings are added. Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-imx')
-rw-r--r--arch/arm/mach-imx/Kconfig8
-rw-r--r--arch/arm/mach-imx/Makefile1
-rw-r--r--arch/arm/mach-imx/clk-imx31.c19
-rw-r--r--arch/arm/mach-imx/imx31-dt.c63
4 files changed, 91 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index eff4db5de0dd..46f5c3fc9276 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -557,6 +557,14 @@ config MACH_BUG
Include support for BUGBase 1.3 platform. This includes specific
configurations for the board and its peripherals.
+config MACH_IMX31_DT
+ bool "Support i.MX31 platforms from device tree"
+ select SOC_IMX31
+ select USE_OF
+ help
+ Include support for Freescale i.MX31 based platforms
+ using the device tree for discovery.
+
comment "MX35 platforms:"
config MACH_PCM043
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index ff29421414f2..07f7c226e4cf 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_MACH_QONG) += mach-qong.o
obj-$(CONFIG_MACH_ARMADILLO5X0) += mach-armadillo5x0.o
obj-$(CONFIG_MACH_KZM_ARM11_01) += mach-kzm_arm11_01.o
obj-$(CONFIG_MACH_BUG) += mach-bug.o
+obj-$(CONFIG_MACH_IMX31_DT) += imx31-dt.o
# i.MX35 based machines
obj-$(CONFIG_MACH_PCM043) += mach-pcm043.o
diff --git a/arch/arm/mach-imx/clk-imx31.c b/arch/arm/mach-imx/clk-imx31.c
index c9a06d800f8e..f87a48fc74e1 100644
--- a/arch/arm/mach-imx/clk-imx31.c
+++ b/arch/arm/mach-imx/clk-imx31.c
@@ -20,6 +20,7 @@
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/err.h>
+#include <linux/of.h>
#include <mach/hardware.h>
#include <mach/mx31.h>
@@ -179,3 +180,21 @@ int __init mx31_clocks_init(unsigned long fref)
return 0;
}
+
+#ifdef CONFIG_OF
+int __init mx31_clocks_init_dt(void)
+{
+ struct device_node *np;
+ u32 fref = 26000000; /* default */
+
+ for_each_compatible_node(np, NULL, "fixed-clock") {
+ if (!of_device_is_compatible(np, "fsl,imx-osc26m"))
+ continue;
+
+ if (!of_property_read_u32(np, "clock-frequency", &fref))
+ break;
+ }
+
+ return mx31_clocks_init(fref);
+}
+#endif
diff --git a/arch/arm/mach-imx/imx31-dt.c b/arch/arm/mach-imx/imx31-dt.c
new file mode 100644
index 000000000000..a68ba207b2b7
--- /dev/null
+++ b/arch/arm/mach-imx/imx31-dt.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 Sascha Hauer, Pengutronix
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/irq.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+#include <mach/common.h>
+#include <mach/mx31.h>
+
+static const struct of_dev_auxdata imx31_auxdata_lookup[] __initconst = {
+ OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART1_BASE_ADDR,
+ "imx21-uart.0", NULL),
+ OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART2_BASE_ADDR,
+ "imx21-uart.1", NULL),
+ OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART3_BASE_ADDR,
+ "imx21-uart.2", NULL),
+ OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART4_BASE_ADDR,
+ "imx21-uart.3", NULL),
+ OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART5_BASE_ADDR,
+ "imx21-uart.4", NULL),
+ { /* sentinel */ }
+};
+
+static void __init imx31_dt_init(void)
+{
+ of_platform_populate(NULL, of_default_bus_match_table,
+ imx31_auxdata_lookup, NULL);
+}
+
+static void __init imx31_timer_init(void)
+{
+ mx31_clocks_init_dt();
+}
+
+static struct sys_timer imx31_timer = {
+ .init = imx31_timer_init,
+};
+
+static const char *imx31_dt_board_compat[] __initdata = {
+ "fsl,imx31",
+ NULL
+};
+
+DT_MACHINE_START(IMX31_DT, "Freescale i.MX31 (Device Tree Support)")
+ .map_io = mx31_map_io,
+ .init_early = imx31_init_early,
+ .init_irq = mx31_init_irq,
+ .handle_irq = imx31_handle_irq,
+ .timer = &imx31_timer,
+ .init_machine = imx31_dt_init,
+ .dt_compat = imx31_dt_board_compat,
+ .restart = mxc_restart,
+MACHINE_END