soc: starfive: Add StarFive JH71XX pmu driver

Add pmu driver for the StarFive JH71XX SoC.

As the power domains provider, the Power Management Unit (PMU) is
designed for including multiple PM domains that can be used for power
gating of selected IP blocks for power saving by reduced leakage
current. It accepts software encourage command to switch the power mode
of SoC.
Signed-off-by: Walker Chen <walker.chen@starfivetech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

MAINTAINERS

@@ -19905,6 +19905,19 @@ F:	Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
 F:	drivers/reset/reset-starfive-jh7100.c
 F:	include/dt-bindings/reset/starfive-jh7100.h
 
+STARFIVE SOC DRIVERS
+M:	Conor Dooley <conor@kernel.org>
+S:	Maintained
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
+F:	drivers/soc/starfive/
+
+STARFIVE JH71XX PMU CONTROLLER DRIVER
+M:	Walker Chen <walker.chen@starfivetech.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/power/starfive*
+F:	drivers/soc/starfive/jh71xx_pmu.c
+F:	include/dt-bindings/power/starfive,jh7110-pmu.h
+
 STATIC BRANCH/CALL
 M:	Peter Zijlstra <peterz@infradead.org>
 M:	Josh Poimboeuf <jpoimboe@kernel.org>

drivers/soc/Kconfig

@@ -22,6 +22,7 @@ source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
 source "drivers/soc/samsung/Kconfig"
 source "drivers/soc/sifive/Kconfig"
+source "drivers/soc/starfive/Kconfig"
 source "drivers/soc/sunxi/Kconfig"
 source "drivers/soc/tegra/Kconfig"
 source "drivers/soc/ti/Kconfig"

drivers/soc/Makefile

@@ -28,6 +28,7 @@ obj-y				+= renesas/
 obj-y				+= rockchip/
 obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
 obj-$(CONFIG_SOC_SIFIVE)	+= sifive/
+obj-$(CONFIG_SOC_STARFIVE)	+= starfive/
 obj-y				+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-y				+= ti/

drivers/soc/starfive/Kconfig

+# SPDX-License-Identifier: GPL-2.0
+
+config JH71XX_PMU
+	bool "Support PMU for StarFive JH71XX Soc"
+	depends on PM
+	depends on SOC_STARFIVE || COMPILE_TEST
+	default SOC_STARFIVE
+	select PM_GENERIC_DOMAINS
+	help
+	  Say 'y' here to enable support power domain support.
+	  In order to meet low power requirements, a Power Management Unit (PMU)
+	  is designed for controlling power resources in StarFive JH71XX SoCs.

drivers/soc/starfive/Makefile

+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_JH71XX_PMU)	+= jh71xx_pmu.o