power: reset: Add Spreadtrum SC27xx PMIC power off support (3f5faf3a) · Commits · 戴 / test

drivers/power/reset/Kconfig

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Original line number	Diff line number	Diff line
		@@ -225,5 +225,14 @@ config SYSCON_REBOOT_MODE
		register, then the bootloader can read it to take different
		action according to the mode.

		config POWER_RESET_SC27XX
		bool "Spreadtrum SC27xx PMIC power-off driver"
		depends on MFD_SC27XX_PMIC \|\| COMPILE_TEST
		help
		This driver supports powering off a system through
		Spreadtrum SC27xx series PMICs. The SC27xx series
		PMICs includes the SC2720, SC2721, SC2723, SC2730
		and SC2731 chips.

		endif

drivers/power/reset/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
		obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
		obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o
		obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
		obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o

drivers/power/reset/sc27xx-poweroff.c

0 → 100644

+66 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (C) 2018 Spreadtrum Communications Inc.
		* Copyright (C) 2018 Linaro Ltd.
		*/

		#include <linux/cpu.h>
		#include <linux/kernel.h>
		#include <linux/platform_device.h>
		#include <linux/pm.h>
		#include <linux/regmap.h>
		#include <linux/syscore_ops.h>

		#define SC27XX_PWR_PD_HW 0xc2c
		#define SC27XX_PWR_OFF_EN BIT(0)

		static struct regmap *regmap;

		/*
		* On Spreadtrum platform, we need power off system through external SC27xx
		* series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC,
		* which is not fast io access.
		*
		* So before stopping other cores, we need release other cores' resource by
		* taking cpus down to avoid racing regmap or spi mutex lock when poweroff
		* system through PMIC.
		*/
		void sc27xx_poweroff_shutdown(void)
		{
		#ifdef CONFIG_PM_SLEEP_SMP
		int cpu = smp_processor_id();

		freeze_secondary_cpus(cpu);
		#endif
		}

		static struct syscore_ops poweroff_syscore_ops = {
		.shutdown = sc27xx_poweroff_shutdown,
		};

		static void sc27xx_poweroff_do_poweroff(void)
		{
		regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN);
		}

		static int sc27xx_poweroff_probe(struct platform_device *pdev)
		{
		if (regmap)
		return -EINVAL;

		regmap = dev_get_regmap(pdev->dev.parent, NULL);
		if (!regmap)
		return -ENODEV;

		pm_power_off = sc27xx_poweroff_do_poweroff;
		register_syscore_ops(&poweroff_syscore_ops);
		return 0;
		}

		static struct platform_driver sc27xx_poweroff_driver = {
		.probe = sc27xx_poweroff_probe,
		.driver = {
		.name = "sc27xx-poweroff",
		},
		};
		builtin_platform_driver(sc27xx_poweroff_driver);

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