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Subject[PATCH 04/19 v3] regulator: max8973: Pass descriptor instead of GPIO number
Date
Instead of passing a global GPIO number, pass a descriptor looked
up with the standard devm_gpiod_get_optional() call.

Cc: Mikko Perttunen <mperttunen@nvidia.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Resending.
ChangeLog v1->v2:
- Rebase the patch on the other changes.
---
drivers/regulator/max8973-regulator.c | 54 ++++++++++++++-------------
1 file changed, 29 insertions(+), 25 deletions(-)

diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index e0c747aa9f85..7cd493ec6315 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -34,6 +34,7 @@
#include <linux/regulator/max8973-regulator.h>
#include <linux/regulator/of_regulator.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/of_gpio.h>
#include <linux/i2c.h>
#include <linux/slab.h>
@@ -114,7 +115,6 @@ struct max8973_chip {
struct regulator_desc desc;
struct regmap *regmap;
bool enable_external_control;
- int enable_gpio;
int dvs_gpio;
int lru_index[MAX8973_MAX_VOUT_REG];
int curr_vout_val[MAX8973_MAX_VOUT_REG];
@@ -567,7 +567,6 @@ static struct max8973_regulator_platform_data *max8973_parse_dt(

pdata->enable_ext_control = of_property_read_bool(np,
"maxim,externally-enable");
- pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0);
pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);

ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
@@ -633,6 +632,8 @@ static int max8973_probe(struct i2c_client *client,
struct max8973_chip *max;
bool pdata_from_dt = false;
unsigned int chip_id;
+ struct gpio_desc *gpiod;
+ enum gpiod_flags gflags;
int ret;

pdata = dev_get_platdata(&client->dev);
@@ -647,8 +648,7 @@ static int max8973_probe(struct i2c_client *client,
return -EIO;
}

- if ((pdata->dvs_gpio == -EPROBE_DEFER) ||
- (pdata->enable_gpio == -EPROBE_DEFER))
+ if (pdata->dvs_gpio == -EPROBE_DEFER)
return -EPROBE_DEFER;

max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
@@ -696,15 +696,11 @@ static int max8973_probe(struct i2c_client *client,
max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;

max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
- max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL;
max->enable_external_control = pdata->enable_ext_control;
max->curr_gpio_val = pdata->dvs_def_state;
max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
max->junction_temp_warning = pdata->junction_temp_warning;

- if (gpio_is_valid(max->enable_gpio))
- max->enable_external_control = true;
-
max->lru_index[0] = max->curr_vout_reg;

if (gpio_is_valid(max->dvs_gpio)) {
@@ -757,27 +753,35 @@ static int max8973_probe(struct i2c_client *client,
break;
}

- if (gpio_is_valid(max->enable_gpio)) {
- config.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
- if (ridata && (ridata->constraints.always_on ||
- ridata->constraints.boot_on))
- config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
- config.ena_gpio = max->enable_gpio;
+ if (ridata && (ridata->constraints.always_on ||
+ ridata->constraints.boot_on))
+ gflags = GPIOD_OUT_HIGH;
+ else
+ gflags = GPIOD_OUT_LOW;
+ gpiod = devm_gpiod_get_optional(&client->dev,
+ "maxim,enable",
+ gflags);
+ if (IS_ERR(gpiod))
+ return PTR_ERR(gpiod);
+ if (gpiod) {
+ config.ena_gpiod = gpiod;
+ max->enable_external_control = true;
}
+
break;

case MAX77621:
- if (gpio_is_valid(max->enable_gpio)) {
- ret = devm_gpio_request_one(&client->dev,
- max->enable_gpio, GPIOF_OUT_INIT_HIGH,
- "max8973-en-gpio");
- if (ret) {
- dev_err(&client->dev,
- "gpio_request for gpio %d failed: %d\n",
- max->enable_gpio, ret);
- return ret;
- }
- }
+ /*
+ * We do not let the core switch this regulator on/off,
+ * we just leave it on.
+ */
+ gpiod = devm_gpiod_get_optional(&client->dev,
+ "maxim,enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(gpiod))
+ return PTR_ERR(gpiod);
+ if (gpiod)
+ max->enable_external_control = true;

max->desc.enable_reg = MAX8973_VOUT;
max->desc.enable_mask = MAX8973_VOUT_ENABLE;
--
2.17.0
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