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power: reset: sc27xx: Power off the external subsystems' connection

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When powering off the whole system, we should power off some external
subsystems' connection firstly, otherwise some external subsystems
will hold some power and result in powering down abnormally.

Signed-off-by: Sherry Zong <sherry.zong@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Sherry Zong 2020-03-09 16:18:44 +08:00 committed by Sebastian Reichel
parent 9027f6111c
commit 6cdd5b09cb
1 changed files with 5 additions and 0 deletions
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5
drivers/power/reset/sc27xx-poweroff.c
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@ -13,6 +13,8 @@
#define SC27XX_PWR_PD_HW 0xc2c
#define SC27XX_PWR_OFF_EN BIT(0)
#define SC27XX_SLP_CTRL 0xdf0
#define SC27XX_LDO_XTL_EN BIT(3)
static struct regmap *regmap;
@ -40,6 +42,9 @@ static struct syscore_ops poweroff_syscore_ops = {
static void sc27xx_poweroff_do_poweroff(void)
{
/* Disable the external subsys connection's power firstly */
regmap_write(regmap, SC27XX_SLP_CTRL, SC27XX_LDO_XTL_EN);
regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN);
}