mfd: rn5t618: Register restart handler

Use the PMIC's repower capability for reboots. Register a restart
handler and use a slightly elevated priority of 192 since the PMIC
has suprior reset capability (causing a system wide reset).

Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index 1831740..ee94080 100644 (file)
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -12,11 +12,13 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rn5t618.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/reboot.h>
 #include <linux/regmap.h>
 
 static const struct mfd_cell rn5t618_cells[] = {
@@ -50,17 +52,38 @@ static const struct regmap_config rn5t618_regmap_config = {
 };
 
 static struct rn5t618 *rn5t618_pm_power_off;
+static struct notifier_block rn5t618_restart_handler;
 
-static void rn5t618_power_off(void)
+static void rn5t618_trigger_poweroff_sequence(bool repower)
 {
        /* disable automatic repower-on */
        regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
-                          RN5T618_REPCNT_REPWRON, 0);
+                          RN5T618_REPCNT_REPWRON,
+                          repower ? RN5T618_REPCNT_REPWRON : 0);
        /* start power-off sequence */
        regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
                           RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
 }
 
+static void rn5t618_power_off(void)
+{
+       rn5t618_trigger_poweroff_sequence(false);
+}
+
+static int rn5t618_restart(struct notifier_block *this,
+                           unsigned long mode, void *cmd)
+{
+       rn5t618_trigger_poweroff_sequence(true);
+
+       /*
+        * Re-power factor detection on PMIC side is not instant. 1ms
+        * proved to be enough time until reset takes effect.
+        */
+       mdelay(1);
+
+       return NOTIFY_DONE;
+}
+
 static const struct of_device_id rn5t618_of_match[] = {
        { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
        { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
@@ -102,13 +125,21 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
                return ret;
        }
 
+       rn5t618_pm_power_off = priv;
        if (of_device_is_system_power_controller(i2c->dev.of_node)) {
-               if (!pm_power_off) {
-                       rn5t618_pm_power_off = priv;
+               if (!pm_power_off)
                        pm_power_off = rn5t618_power_off;
-               } else {
+               else
                        dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
-               }
+       }
+
+       rn5t618_restart_handler.notifier_call = rn5t618_restart;
+       rn5t618_restart_handler.priority = 192;
+
+       ret = register_restart_handler(&rn5t618_restart_handler);
+       if (ret) {
+               dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
+               return ret;
        }
 
        return 0;