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backlight: bd6107: Convert to use GPIO descriptor 

The Rohm BD6107 driver can pass a fixed GPIO line using the old
GPIO API using platform data. As there are no in-tree users of this
platform data since 2013, we can convert this to use a GPIO descriptor
and require any out-of-tree consumers to pass the GPIO using
a machine descriptor table instead.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij 2019-12-02 11:30:28 +01:00 committed by Lee Jones
parent edeec4fdc7
commit c8fdcc8672
2 changed files with 16 additions and 9 deletions
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24
drivers/video/backlight/bd6107.c
View File

@ -11,7 +11,7 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/bd6107.h>
@ -71,6 +71,7 @@ struct bd6107 {
struct i2c_client *client;
struct backlight_device *backlight;
struct bd6107_platform_data *pdata;
struct gpio_desc *reset;
};
static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)
@ -94,9 +95,10 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
bd6107_write(bd, BD6107_MAINCNT1, brightness);
bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);
} else {
gpio_set_value(bd->pdata->reset, 0);
/* Assert the reset line (gpiolib will handle active low) */
gpiod_set_value(bd->reset, 1);
msleep(24);
gpio_set_value(bd->pdata->reset, 1);
gpiod_set_value(bd->reset, 0);
}
return 0;
@ -125,8 +127,8 @@ static int bd6107_probe(struct i2c_client *client,
struct bd6107 *bd;
int ret;
if (pdata == NULL || !pdata->reset) {
dev_err(&client->dev, "No reset GPIO in platform data\n");
if (pdata == NULL) {
dev_err(&client->dev, "No platform data\n");
return -EINVAL;
}
@ -144,10 +146,16 @@ static int bd6107_probe(struct i2c_client *client,
bd->client = client;
bd->pdata = pdata;
ret = devm_gpio_request_one(&client->dev, pdata->reset,
GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");
if (ret < 0) {
/*
* Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted,
* so in the machine descriptor table (or other hardware description),
* the line should be flagged as active low so this will assert
* the reset.
*/
bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(bd->reset)) {
dev_err(&client->dev, "unable to request reset GPIO\n");
ret = PTR_ERR(bd->reset);
return ret;
}

1
include/linux/platform_data/bd6107.h
View File

@ -9,7 +9,6 @@ struct device;
struct bd6107_platform_data {
struct device *fbdev;
int reset; /* Reset GPIO */
unsigned int def_value;
};