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Subject[PATCH 1/2] mfd: rk808: add reboot support to rk808 pmic
Date
From: Peter Geis <pgwipeout@gmail.com>

This adds reboot support to the rk808 pmic. This only enables if the
rockchip,system-power-controller flag is set.

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
---
drivers/mfd/rk808.c | 48 +++++++++++++++++++++++++++++++++++++++
include/linux/mfd/rk808.h | 2 ++
2 files changed, 50 insertions(+)

diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index b181fe401330..afbd7e01df50 100644
--- a/drivers/mfd/rk808.c
+++ b/drivers/mfd/rk808.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
+#include <linux/reboot.h>

struct rk808_reg_data {
int addr;
@@ -533,6 +534,7 @@ static void rk808_pm_power_off(void)
int ret;
unsigned int reg, bit;
struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+ dev_err(&rk808_i2c_client->dev, "poweroff device!\n");

switch (rk808->variant) {
case RK805_ID:
@@ -552,6 +554,7 @@ static void rk808_pm_power_off(void)
bit = DEV_OFF;
break;
default:
+ dev_err(&rk808_i2c_client->dev, "poweroff device not supported!\n");
return;
}
ret = regmap_update_bits(rk808->regmap, reg, bit, bit);
@@ -559,6 +562,44 @@ static void rk808_pm_power_off(void)
dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
}

+static int rk808_restart_notify(struct notifier_block *this, unsigned long mode, void *cmd)
+{
+ int ret;
+ unsigned int reg, bit;
+ struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+
+ switch (rk808->variant) {
+ case RK805_ID:
+ reg = RK805_DEV_CTRL_REG;
+ bit = DEV_OFF_RST;
+ break;
+ case RK808_ID:
+ reg = RK808_DEVCTRL_REG,
+ bit = DEV_OFF;
+ break;
+ case RK817_ID:
+ reg = RK817_SYS_CFG(3);
+ bit = DEV_RST;
+ break;
+ case RK818_ID:
+ reg = RK818_DEVCTRL_REG;
+ bit = DEV_OFF_RST;
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+ ret = regmap_update_bits(rk808->regmap, reg, bit, bit);
+ if (ret)
+ dev_err(&rk808_i2c_client->dev, "Failed to restart device!\n");
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block rk808_restart_handler = {
+ .notifier_call = rk808_restart_notify,
+ .priority = 255,
+};
+
static void rk8xx_shutdown(struct i2c_client *client)
{
struct rk808 *rk808 = i2c_get_clientdata(client);
@@ -727,6 +768,13 @@ static int rk808_probe(struct i2c_client *client,
if (of_property_read_bool(np, "rockchip,system-power-controller")) {
rk808_i2c_client = client;
pm_power_off = rk808_pm_power_off;
+ rk808->nb = &rk808_restart_handler;
+
+ dev_warn(&client->dev, "register restart handler\n");
+
+ ret = register_restart_handler(rk808->nb);
+ if (ret)
+ dev_err(&client->dev, "failed to register restart handler, %d\n", ret);
}

return 0;
diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
index a96e6d43ca06..5dfe0c4ceab1 100644
--- a/include/linux/mfd/rk808.h
+++ b/include/linux/mfd/rk808.h
@@ -373,6 +373,7 @@ enum rk805_reg {
#define SWITCH2_EN BIT(6)
#define SWITCH1_EN BIT(5)
#define DEV_OFF_RST BIT(3)
+#define DEV_RST BIT(2)
#define DEV_OFF BIT(0)
#define RTC_STOP BIT(0)

@@ -701,5 +702,6 @@ struct rk808 {
long variant;
const struct regmap_config *regmap_cfg;
const struct regmap_irq_chip *regmap_irq_chip;
+ struct notifier_block *nb;
};
#endif /* __LINUX_REGULATOR_RK808_H */
--
2.25.1
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