From: Benjamin Bara <benjamin.bara@xxxxxxxxxxx>
The PCA9450 supports both, a warm and a cold reset. Implement both and
register the respective handlers.
Signed-off-by: Benjamin Bara <benjamin.bara@xxxxxxxxxxx>
---
drivers/regulator/pca9450-regulator.c | 59 +++++++++++++++++++++++++++++++++++
include/linux/regulator/pca9450.h | 7 +++++
2 files changed, 66 insertions(+)
diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9450-regulator.c
index 2ab365d2749f..86903d677bf6 100644
--- a/drivers/regulator/pca9450-regulator.c
+++ b/drivers/regulator/pca9450-regulator.c
@@ -38,6 +38,11 @@ struct pca9450 {
int irq;
};
+static inline struct pca9450 *dev_to_pca9450(struct device *dev)
+{
+ return dev_get_drvdata(dev);
+}
+
static const struct regmap_range pca9450_status_range = {
.range_min = PCA9450_REG_INT1,
.range_max = PCA9450_REG_PWRON_STAT,
@@ -219,6 +224,42 @@ static int pca9450_set_dvs_levels(struct device_node *np,
return ret;
}
+static int pca9450_cold_reset(struct pca9450 *pca9450)
+{
+ int ret;
+
+ ret = regmap_write(pca9450->regmap, PCA9450_REG_SWRST,
+ SWRST_RESET_COLD_LDO12);
+ if (ret)
+ return ret;
+
+ /* t_RESTART is 250 ms. */
+ mdelay(500);
+ return -ETIME;
+}
+
+static int pca9450_warm_reset(struct pca9450 *pca9450)
+{
+ int ret;
+
+ ret = regmap_write(pca9450->regmap, PCA9450_REG_SWRST,
+ SWRST_RESET_WARM);
+ if (ret)
+ return ret;
+
+ /* t_RESET is 20 ms. */
+ mdelay(50);
+ return -ETIME;
+}
+
+static int pca9450_restart_handler(struct sys_off_data *data)
+{
+ int (*handler)(struct pca9450 *) = data->cb_data;
+ struct pca9450 *pca9450 = dev_to_pca9450(data->dev);
+
+ return handler(pca9450);
+}
+
static const struct pca9450_regulator_desc pca9450a_regulators[] = {
{
.desc = {
@@ -845,6 +886,24 @@ static int pca9450_i2c_probe(struct i2c_client *i2c)
return PTR_ERR(pca9450->sd_vsel_gpio);
}
+ ret = devm_register_cold_restart_handler(pca9450->dev,
+ pca9450_restart_handler,
+ pca9450_cold_reset);
+ if (ret) {
+ dev_err(&i2c->dev, "register cold restart handler failed: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = devm_register_warm_restart_handler(pca9450->dev,
+ pca9450_restart_handler,
+ pca9450_warm_reset);
+ if (ret) {
+ dev_err(&i2c->dev, "register warm restart handler failed: %d\n",
+ ret);
+ return ret;
+ }
+
dev_info(&i2c->dev, "%s probed.\n",
type == PCA9450_TYPE_PCA9450A ? "pca9450a" : "pca9450bc");
diff --git a/include/linux/regulator/pca9450.h b/include/linux/regulator/pca9450.h
index 505c908dbb81..a72fd4942d5f 100644
--- a/include/linux/regulator/pca9450.h
+++ b/include/linux/regulator/pca9450.h
@@ -93,6 +93,13 @@ enum {
PCA9450_MAX_REGISTER = 0x2F,
};
+/* PCA9450 SW_RST bits */
+#define SWRST_NOACTION 0x00
+#define SWRST_RESET_REGS 0x05
+#define SWRST_RESET_COLD_LDO12 0x14
+#define SWRST_RESET_WARM 0x35
+#define SWRST_RESET_COLD 0x64
+
/* PCA9450 BUCK ENMODE bits */
#define BUCK_ENMODE_OFF 0x00
#define BUCK_ENMODE_ONREQ 0x01
--
2.34.1
