regulator: lp872x: Add enable GPIO pin support
LP872x regulators are made active via the EN pin, which might be hooked to a GPIO. This adds support for driving the GPIO high when the driver is in use. Signed-off-by: Paul Kocialkowski <contact@paulk.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -28,6 +28,7 @@ Optional properties:
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- ti,dvs-gpio: GPIO specifier for external DVS pin control of LP872x devices.
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- ti,dvs-vsel: DVS selector. 0 = SEL_V1, 1 = SEL_V2.
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- ti,dvs-state: initial DVS pin state. 0 = DVS_LOW, 1 = DVS_HIGH.
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- enable-gpios: GPIO specifier for EN pin control of LP872x devices.
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Sub nodes for regulator_init_data
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LP8720 has maximum 6 nodes. (child name: ldo1 ~ 5 and buck)
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@ -15,6 +15,7 @@
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/regulator/lp872x.h>
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#include <linux/regulator/driver.h>
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#include <linux/platform_device.h>
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@ -757,6 +758,33 @@ static int lp872x_init_dvs(struct lp872x *lp)
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default_dvs_mode[lp->chipid]);
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}
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static int lp872x_hw_enable(struct lp872x *lp)
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{
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int ret, gpio;
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if (!lp->pdata)
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return -EINVAL;
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gpio = lp->pdata->enable_gpio;
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if (!gpio_is_valid(gpio))
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return 0;
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/* Always set enable GPIO high. */
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ret = devm_gpio_request_one(lp->dev, gpio, GPIOF_OUT_INIT_HIGH, "LP872X EN");
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if (ret) {
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dev_err(lp->dev, "gpio request err: %d\n", ret);
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return ret;
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}
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/* Each chip has a different enable delay. */
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if (lp->chipid == LP8720)
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usleep_range(LP8720_ENABLE_DELAY, 1.5 * LP8720_ENABLE_DELAY);
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else
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usleep_range(LP8725_ENABLE_DELAY, 1.5 * LP8725_ENABLE_DELAY);
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return 0;
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}
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static int lp872x_config(struct lp872x *lp)
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{
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struct lp872x_platform_data *pdata = lp->pdata;
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@ -875,6 +903,8 @@ static struct lp872x_platform_data
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of_property_read_u8(np, "ti,dvs-state", &dvs_state);
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pdata->dvs->init_state = dvs_state ? DVS_HIGH : DVS_LOW;
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pdata->enable_gpio = of_get_named_gpio(np, "enable-gpios", 0);
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if (of_get_child_count(np) == 0)
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goto out;
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@ -948,6 +978,10 @@ static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
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lp->chipid = id->driver_data;
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i2c_set_clientdata(cl, lp);
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ret = lp872x_hw_enable(lp);
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if (ret)
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return ret;
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ret = lp872x_config(lp);
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if (ret)
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return ret;
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@ -18,6 +18,9 @@
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#define LP872X_MAX_REGULATORS 9
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#define LP8720_ENABLE_DELAY 200
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#define LP8725_ENABLE_DELAY 30000
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enum lp872x_regulator_id {
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LP8720_ID_BASE,
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LP8720_ID_LDO1 = LP8720_ID_BASE,
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@ -79,12 +82,14 @@ struct lp872x_regulator_data {
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* @update_config : if LP872X_GENERAL_CFG register is updated, set true
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* @regulator_data : platform regulator id and init data
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* @dvs : dvs data for buck voltage control
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* @enable_gpio : gpio pin number for enable control
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*/
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struct lp872x_platform_data {
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u8 general_config;
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bool update_config;
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struct lp872x_regulator_data regulator_data[LP872X_MAX_REGULATORS];
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struct lp872x_dvs *dvs;
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int enable_gpio;
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};
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#endif
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