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Commit 3f5faf3a authored by Baolin Wang's avatar Baolin Wang Committed by Sebastian Reichel
Browse files

power: reset: Add Spreadtrum SC27xx PMIC power off support 



On Spreadtrum platform, we need power off system through external SC27xx
series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips.
Thus this patch adds SC27xx series PMICs power-off support.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.co.uk>
parent 6ff653e3

drivers/power/reset/Kconfig

+9 −0
Original line number Original line Diff line number Diff line
@@ -225,5 +225,14 @@ config SYSCON_REBOOT_MODE 
	  register, then the bootloader can read it to take different

	  register, then the bootloader can read it to take different

	  action according to the mode.

	  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

endif

drivers/power/reset/Makefile

+1 −0
Original line number Original line 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_POWER_RESET_ZX) += zx-reboot.o

obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o

obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o

obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-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 Original line 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);