mfd: rk808: Add reboot support to rk808.c
This adds reboot support to the rk808 pmic driver and enables it for
the rk809 and rk817 devices.
This only enables if the rockchip,system-power-controller flag is set.
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220208194023.929720-1-pgwipeout@gmail.com
diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index b181fe4..4142b63 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;
@@ -543,6 +544,7 @@ static void rk808_pm_power_off(void)
reg = RK808_DEVCTRL_REG,
bit = DEV_OFF_RST;
break;
+ case RK809_ID:
case RK817_ID:
reg = RK817_SYS_CFG(3);
bit = DEV_OFF;
@@ -559,6 +561,34 @@ 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)
+{
+ struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+ unsigned int reg, bit;
+ int ret;
+
+ switch (rk808->variant) {
+ case RK809_ID:
+ case RK817_ID:
+ reg = RK817_SYS_CFG(3);
+ bit = DEV_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 = 192,
+};
+
static void rk8xx_shutdown(struct i2c_client *client)
{
struct rk808 *rk808 = i2c_get_clientdata(client);
@@ -727,6 +757,18 @@ 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;
+
+ switch (rk808->variant) {
+ case RK809_ID:
+ case RK817_ID:
+ ret = register_restart_handler(&rk808_restart_handler);
+ if (ret)
+ dev_warn(&client->dev, "failed to register rst handler, %d\n", ret);
+ break;
+ default:
+ dev_dbg(&client->dev, "pmic controlled board reset not supported\n");
+ break;
+ }
}
return 0;
@@ -749,6 +791,8 @@ static int rk808_remove(struct i2c_client *client)
if (pm_power_off == rk808_pm_power_off)
pm_power_off = NULL;
+ unregister_restart_handler(&rk808_restart_handler);
+
return 0;
}
