Adding support to configure regulator POK mapping bit
to control nRST_IO and GPIO1 POK function.
In tegra based platform which uses MAX20024 pmic, when
some of regulators are configured FPS_NONE(flexible power sequencer)
causes PMIC GPIO1 to go low which lead to various other rails turning off,
to avoid this MPOK bit of those regulators need to be set to 0
so that PMIC GPIO1 will not go low.
Signed-off-by: Venkat Reddy Talla <vreddytalla@xxxxxxxxxx>
---
changes in v2:
- updated commit message for the patch
- address review comments
---
drivers/regulator/max77620-regulator.c | 46 ++++++++++++++++++++++++++++++++++
include/linux/mfd/max77620.h | 2 ++
2 files changed, 48 insertions(+)
diff --git a/drivers/regulator/max77620-regulator.c b/drivers/regulator/max77620-regulator.c
index a1b49a6..850b14c 100644
--- a/drivers/regulator/max77620-regulator.c
+++ b/drivers/regulator/max77620-regulator.c
@@ -81,6 +81,7 @@ struct max77620_regulator_pdata {
int suspend_fps_pd_slot;
int suspend_fps_pu_slot;
int current_mode;
+ int power_ok;
int ramp_rate_setting;
};
@@ -351,11 +352,48 @@ static int max77620_set_slew_rate(struct max77620_regulator *pmic, int id,
return 0;
}
+static int max77620_config_power_ok(struct max77620_regulator *pmic, int id)
+{
+ struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
+ struct max77620_regulator_info *rinfo = pmic->rinfo[id];
+ struct max77620_chip *chip = dev_get_drvdata(pmic->dev->parent);
+ u8 val, mask;
+ int ret;
+
+ switch (chip->chip_id) {
+ case MAX20024:
+ if (rpdata->power_ok >= 0) {
+ if (rinfo->type == MAX77620_REGULATOR_TYPE_SD)
+ mask = MAX20024_SD_CFG1_MPOK_MASK;
+ else
+ mask = MAX20024_LDO_CFG2_MPOK_MASK;
+
+ val = rpdata->power_ok ? mask : 0;
+
+ ret = regmap_update_bits(pmic->rmap, rinfo->cfg_addr,
+ mask, val);
+ if (ret < 0) {
+ dev_err(pmic->dev, "Reg 0x%02x update failed %d\n",
+ rinfo->cfg_addr, ret);
+ return ret;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
static int max77620_init_pmic(struct max77620_regulator *pmic, int id)
{
struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
int ret;
+ max77620_config_power_ok(pmic, id);
+
/* Update power mode */
ret = max77620_regulator_get_power_mode(pmic, id);
if (ret < 0)
@@ -595,6 +633,12 @@ static int max77620_of_parse_cb(struct device_node *np,
np, "maxim,suspend-fps-power-down-slot", &pval);
rpdata->suspend_fps_pd_slot = (!ret) ? pval : -1;
+ ret = of_property_read_u32(np, "maxim,power-ok-control", &pval);
+ if (!ret)
+ rpdata->power_ok = pval;
+ else
+ rpdata->power_ok = -1;
+
ret = of_property_read_u32(np, "maxim,ramp-rate-setting", &pval);
rpdata->ramp_rate_setting = (!ret) ? pval : 0;
@@ -807,6 +851,8 @@ static int max77620_regulator_resume(struct device *dev)
for (id = 0; id < MAX77620_NUM_REGS; id++) {
reg_pdata = &pmic->reg_pdata[id];
+ max77620_config_power_ok(pmic, id);
+
max77620_regulator_set_fps_slots(pmic, id, false);
if (reg_pdata->active_fps_src < 0)
continue;
diff --git a/include/linux/mfd/max77620.h b/include/linux/mfd/max77620.h
index 3ca0af07..ad2a9a8 100644
--- a/include/linux/mfd/max77620.h
+++ b/include/linux/mfd/max77620.h
@@ -180,6 +180,7 @@
#define MAX77620_SD_CFG1_FPWM_SD_MASK BIT(2)
#define MAX77620_SD_CFG1_FPWM_SD_SKIP 0
#define MAX77620_SD_CFG1_FPWM_SD_FPWM BIT(2)
+#define MAX20024_SD_CFG1_MPOK_MASK BIT(1)
#define MAX77620_SD_CFG1_FSRADE_SD_MASK BIT(0)
#define MAX77620_SD_CFG1_FSRADE_SD_DISABLE 0
#define MAX77620_SD_CFG1_FSRADE_SD_ENABLE BIT(0)
@@ -187,6 +188,7 @@
/* LDO_CNFG2 */
#define MAX77620_LDO_POWER_MODE_MASK 0xC0
#define MAX77620_LDO_POWER_MODE_SHIFT 6
+#define MAX20024_LDO_CFG2_MPOK_MASK BIT(2)
#define MAX77620_LDO_CFG2_ADE_MASK BIT(1)
#define MAX77620_LDO_CFG2_ADE_DISABLE 0
#define MAX77620_LDO_CFG2_ADE_ENABLE BIT(1)
--
2.1.4
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