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Message-Id: <20250926-sc2730-reboot-v1-5-62ebfd3d31bb@abscue.de>
Date: Fri, 26 Sep 2025 18:23:27 +0200
From: Otto Pflüger <otto.pflueger@...cue.de>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Orson Zhai <orsonzhai@...il.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Chunyan Zhang <zhang.lyra@...il.com>, Lee Jones <lee@...nel.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Otto Pflüger <otto.pflueger@...cue.de>
Subject: [PATCH 5/5] power: reset: sc27xx: Add reboot support for SC2730
Unlike SC2731, the SC2730 PMIC also provides dedicated registers for
resetting the hardware. Use them to implement reboot support.
Signed-off-by: Otto Pflüger <otto.pflueger@...cue.de>
---
drivers/power/reset/sc27xx-poweroff.c | 89 +++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c
index 5937f40021817ea38453705fcef6485ce79ac14c..1dfa54675b3e7b8b79212dc9950d97b726dd5acc 100644
--- a/drivers/power/reset/sc27xx-poweroff.c
+++ b/drivers/power/reset/sc27xx-poweroff.c
@@ -18,16 +18,42 @@
#define SC2730_SLP_CTRL 0x1a48
#define SC2730_LDO_XTL_EN BIT(2)
+#define SC2730_SOFT_RST_HW 0x1824
+#define SC2730_RST_STATUS 0x1bac
+#define SC2730_SWRST_CTRL0 0x1bf8
+
#define SC2731_PWR_PD_HW 0xc2c
#define SC2731_SLP_CTRL 0xdf0
#define SC2731_LDO_XTL_EN BIT(3)
#define SC27XX_PWR_OFF_EN BIT(0)
+#define SC27XX_SOFT_RST_EN BIT(4)
+#define SC27XX_RESET BIT(0)
+
+#define HWRST_STATUS_SECURITY 0x02
+#define HWRST_STATUS_RECOVERY 0x20
+#define HWRST_STATUS_NORMAL 0x40
+#define HWRST_STATUS_ALARM 0x50
+#define HWRST_STATUS_SLEEP 0x60
+#define HWRST_STATUS_FASTBOOT 0x30
+#define HWRST_STATUS_SPECIAL 0x70
+#define HWRST_STATUS_PANIC 0x80
+#define HWRST_STATUS_CFTREBOOT 0x90
+#define HWRST_STATUS_AUTODLOADER 0xa0
+#define HWRST_STATUS_IQMODE 0xb0
+#define HWRST_STATUS_SPRDISK 0xc0
+#define HWRST_STATUS_FACTORYTEST 0xe0
+#define HWRST_STATUS_WATCHDOG 0xf0
+#define HWRST_STATUS_MASK 0xf0
struct sc27xx_poweroff_reg_info {
u32 poweroff_reg;
u32 slp_ctrl_reg;
u32 ldo_xtl_en;
+
+ u32 reset_reg;
+ u32 rst_sts_reg;
+ u32 swrst_ctrl_reg;
};
struct sc27xx_poweroff_data {
@@ -78,9 +104,59 @@ static int sc27xx_poweroff_do_poweroff(struct sys_off_data *off_data)
return NOTIFY_DONE;
}
+static int sc27xx_restart(struct sys_off_data *off_data)
+{
+ struct sc27xx_poweroff_data *data = off_data->cb_data;
+ u32 reboot_mode = 0;
+
+ if (!off_data->cmd)
+ reboot_mode = HWRST_STATUS_NORMAL;
+ else if (!strcmp(off_data->cmd, "recovery"))
+ reboot_mode = HWRST_STATUS_RECOVERY;
+ else if (!strcmp(off_data->cmd, "alarm"))
+ reboot_mode = HWRST_STATUS_ALARM;
+ else if (!strcmp(off_data->cmd, "fastsleep"))
+ reboot_mode = HWRST_STATUS_SLEEP;
+ else if (!strcmp(off_data->cmd, "bootloader"))
+ reboot_mode = HWRST_STATUS_FASTBOOT;
+ else if (!strcmp(off_data->cmd, "panic"))
+ reboot_mode = HWRST_STATUS_PANIC;
+ else if (!strcmp(off_data->cmd, "special"))
+ reboot_mode = HWRST_STATUS_SPECIAL;
+ else if (!strcmp(off_data->cmd, "cftreboot"))
+ reboot_mode = HWRST_STATUS_CFTREBOOT;
+ else if (!strcmp(off_data->cmd, "autodloader"))
+ reboot_mode = HWRST_STATUS_AUTODLOADER;
+ else if (!strcmp(off_data->cmd, "iqmode"))
+ reboot_mode = HWRST_STATUS_IQMODE;
+ else if (!strcmp(off_data->cmd, "sprdisk"))
+ reboot_mode = HWRST_STATUS_SPRDISK;
+ else if (!strcmp(off_data->cmd, "tospanic"))
+ reboot_mode = HWRST_STATUS_SECURITY;
+ else if (!strcmp(off_data->cmd, "factorytest"))
+ reboot_mode = HWRST_STATUS_FACTORYTEST;
+ else
+ reboot_mode = HWRST_STATUS_NORMAL;
+
+ regmap_update_bits(data->regmap, data->regs->rst_sts_reg,
+ HWRST_STATUS_MASK, reboot_mode);
+
+ regmap_set_bits(data->regmap, data->regs->swrst_ctrl_reg,
+ SC27XX_SOFT_RST_EN);
+
+ regmap_write(data->regmap, data->regs->reset_reg, SC27XX_RESET);
+
+ mdelay(1000);
+
+ pr_emerg("Unable to restart system\n");
+
+ return NOTIFY_DONE;
+}
+
static int sc27xx_poweroff_probe(struct platform_device *pdev)
{
struct sc27xx_poweroff_data *data;
+ int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
@@ -96,6 +172,15 @@ static int sc27xx_poweroff_probe(struct platform_device *pdev)
register_syscore_ops(&poweroff_syscore_ops);
+ if (data->regs->reset_reg) {
+ ret = devm_register_sys_off_handler(&pdev->dev,
+ SYS_OFF_MODE_RESTART,
+ 192, sc27xx_restart,
+ data);
+ if (ret)
+ return ret;
+ }
+
return devm_register_sys_off_handler(&pdev->dev,
SYS_OFF_MODE_POWER_OFF,
SYS_OFF_PRIO_DEFAULT,
@@ -107,6 +192,10 @@ static const struct sc27xx_poweroff_reg_info sc2730_pwr_regs = {
.poweroff_reg = SC2730_PWR_PD_HW,
.slp_ctrl_reg = SC2730_SLP_CTRL,
.ldo_xtl_en = SC2730_LDO_XTL_EN,
+
+ .reset_reg = SC2730_SOFT_RST_HW,
+ .rst_sts_reg = SC2730_RST_STATUS,
+ .swrst_ctrl_reg = SC2730_SWRST_CTRL0,
};
static const struct sc27xx_poweroff_reg_info sc2731_pwr_regs = {
--
2.50.0
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