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regulator: lp8788-ldo: Pass descriptor instead of GPIO number 

Instead of passing a global GPIO number, pass a descriptor looked
up with the standard devm_gpiod_get_index_optional() call.

This driver has supported passing a LDO enable GPIO for years,
yet this facility has never been put to use in the upstream kernel.
If someone desires to put in place GPIO control for the LDOs,
this can be done by adding a GPIO descriptor table in the MFD
nexus in drivers/mfd/lp8788.c for the LDO device when spawning the
MFD children, or using a board file.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Linus Walleij 2018-05-14 10:06:28 +02:00 committed by Mark Brown
parent b2d751b7f6
commit 2468f0d515
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 16 additions and 32 deletions
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32
drivers/regulator/lp8788-ldo.c
View File

@ -16,7 +16,7 @@
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/mfd/lp8788.h>
/* register address */
@ -85,8 +85,6 @@
#define LP8788_STARTUP_TIME_S 3
#define ENABLE_TIME_USEC 32
#define ENABLE GPIOF_OUT_INIT_HIGH
#define DISABLE GPIOF_OUT_INIT_LOW
enum lp8788_ldo_id {
DLDO1,
@ -117,7 +115,7 @@ struct lp8788_ldo {
struct lp8788 *lp;
struct regulator_desc *desc;
struct regulator_dev *regulator;
struct lp8788_ldo_enable_pin *en_pin;
struct gpio_desc *ena_gpiod;
};
/* DLDO 1, 2, 3, 9 voltage table */
@ -469,7 +467,6 @@ static int lp8788_config_ldo_enable_mode(struct platform_device *pdev,
enum lp8788_ldo_id id)
{
struct lp8788 *lp = ldo->lp;
struct lp8788_platform_data *pdata = lp->pdata;
enum lp8788_ext_ldo_en_id enable_id;
u8 en_mask[] = {
[EN_ALDO1] = LP8788_EN_SEL_ALDO1_M,
@ -504,11 +501,18 @@ static int lp8788_config_ldo_enable_mode(struct platform_device *pdev,
return 0;
}
/* if no platform data for ldo pin, then set default enable mode */
if (!pdata || !pdata->ldo_pin || !pdata->ldo_pin[enable_id])
/* FIXME: check default mode for GPIO here: high or low? */
ldo->ena_gpiod = devm_gpiod_get_index_optional(&pdev->dev,
"enable",
enable_id,
GPIOD_OUT_HIGH);
if (IS_ERR(ldo->ena_gpiod))
return PTR_ERR(ldo->ena_gpiod);
/* if no GPIO for ldo pin, then set default enable mode */
if (!ldo->ena_gpiod)
goto set_default_ldo_enable_mode;
ldo->en_pin = pdata->ldo_pin[enable_id];
return 0;
set_default_ldo_enable_mode:
@ -533,10 +537,8 @@ static int lp8788_dldo_probe(struct platform_device *pdev)
if (ret)
return ret;
if (ldo->en_pin) {
cfg.ena_gpio = ldo->en_pin->gpio;
cfg.ena_gpio_flags = ldo->en_pin->init_state;
}
if (ldo->ena_gpiod)
cfg.ena_gpiod = ldo->ena_gpiod;
cfg.dev = pdev->dev.parent;
cfg.init_data = lp->pdata ? lp->pdata->dldo_data[id] : NULL;
@ -582,10 +584,8 @@ static int lp8788_aldo_probe(struct platform_device *pdev)
if (ret)
return ret;
if (ldo->en_pin) {
cfg.ena_gpio = ldo->en_pin->gpio;
cfg.ena_gpio_flags = ldo->en_pin->init_state;
}
if (ldo->ena_gpiod)
cfg.ena_gpiod = ldo->ena_gpiod;
cfg.dev = pdev->dev.parent;
cfg.init_data = lp->pdata ? lp->pdata->aldo_data[id] : NULL;

16
include/linux/mfd/lp8788.h
View File

@ -181,20 +181,6 @@ struct lp8788_buck2_dvs {
enum lp8788_dvs_sel vsel;
};
/*
* struct lp8788_ldo_enable_pin
*
* Basically, all LDOs are enabled through the I2C commands.
* But ALDO 1 ~ 5, 7, DLDO 7, 9, 11 can be enabled by external gpio pins.
*
* @gpio : gpio number which is used for enabling ldos
* @init_state : initial gpio state (ex. GPIOF_OUT_INIT_LOW)
*/
struct lp8788_ldo_enable_pin {
int gpio;
int init_state;
};
/*
* struct lp8788_chg_param
* @addr : charging control register address (range : 0x11 ~ 0x1C)
@ -288,7 +274,6 @@ struct lp8788_vib_platform_data {
* @aldo_data : regulator initial data for analog ldo
* @buck1_dvs : gpio configurations for buck1 dvs
* @buck2_dvs : gpio configurations for buck2 dvs
* @ldo_pin : gpio configurations for enabling LDOs
* @chg_pdata : platform data for charger driver
* @alarm_sel : rtc alarm selection (1 or 2)
* @bl_pdata : configurable data for backlight driver
@ -306,7 +291,6 @@ struct lp8788_platform_data {
struct regulator_init_data *aldo_data[LP8788_NUM_ALDOS];
struct lp8788_buck1_dvs *buck1_dvs;
struct lp8788_buck2_dvs *buck2_dvs;
struct lp8788_ldo_enable_pin *ldo_pin[EN_LDOS_MAX];
/* charger */
struct lp8788_charger_platform_data *chg_pdata;