p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Baolin Wang 2018-02-26 10:23:14 +08:00 committed by Sebastian Reichel
parent 6ff653e3e8
commit 3f5faf3a06
3 changed files with 76 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/power/reset/Kconfig
View File

@ -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

1
drivers/power/reset/Makefile
View File

@ -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

66
drivers/power/reset/sc27xx-poweroff.c Normal file
View File

@ -0,0 +1,66 @@
// 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);