soc: apple: Add driver for Apple PMGR power state controls

Implements genpd and reset providers for downstream devices. Each
instance of the driver binds to a single register and represents a
single SoC power domain.

The driver does not currently implement all features (clockgate-only
state, misc flags), but we declare the respective registers for
documentation purposes. These features will be added as they become
useful for downstream devices.

This also creates the apple/soc tree and Kconfig submenu.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Hector Martin <marcan@marcan.st>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/soc/apple/Kconfig b/drivers/soc/apple/Kconfig
new file mode 100644
index 000000000000..3eb14abf8d33
--- /dev/null
+++ b/drivers/soc/apple/Kconfig
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+if ARCH_APPLE || COMPILE_TEST
+
+menu "Apple SoC drivers"
+
+config APPLE_PMGR_PWRSTATE
+	tristate "Apple SoC PMGR power state control"
+	depends on PM
+	select REGMAP
+	select MFD_SYSCON
+	select PM_GENERIC_DOMAINS
+	select RESET_CONTROLLER
+	default ARCH_APPLE
+	help
+	  The PMGR block in Apple SoCs provides high-level power state
+	  controls for SoC devices. This driver manages them through the
+	  generic power domain framework, and also provides reset support.
+
+endmenu
+
+endif