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backlight: lms283gf05: Convert to GPIO descriptors

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This converts the lms283gf05 backlight driver to use GPIO
descriptors and switches the single PXA Palm Z2 device
over to defining these.

Since the platform data was only used to convey GPIO
information we can delete the platform data header.

Notice that we define the proper active low semantics in
the board file GPIO descriptor table (active low) and
assert the reset line by bringing it to "1" (asserted).

Cc: Marek Vasut <marex@denx.de>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij 2021-01-18 14:23:22 +01:00 committed by Lee Jones
parent 5c8fe583cc
commit 93cc26fa8f
3 changed files with 25 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm/mach-pxa/z2.c
View File

@ -20,7 +20,6 @@
#include <linux/spi/spi.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/spi/libertas_spi.h>
#include <linux/spi/lms283gf05.h>
#include <linux/power_supply.h>
#include <linux/mtd/physmap.h>
#include <linux/gpio.h>
@ -578,8 +577,13 @@ static struct pxa2xx_spi_chip lms283_chip_info = {
.gpio_cs = GPIO88_ZIPITZ2_LCD_CS,
};
static const struct lms283gf05_pdata lms283_pdata = {
.reset_gpio = GPIO19_ZIPITZ2_LCD_RESET,
static struct gpiod_lookup_table lms283_gpio_table = {
.dev_id = "spi2.0", /* SPI bus 2 chip select 0 */
.table = {
GPIO_LOOKUP("gpio-pxa", GPIO19_ZIPITZ2_LCD_RESET,
"reset", GPIO_ACTIVE_LOW),
{ },
},
};
static struct spi_board_info spi_board_info[] __initdata = {
@ -595,7 +599,6 @@ static struct spi_board_info spi_board_info[] __initdata = {
{
.modalias = "lms283gf05",
.controller_data = &lms283_chip_info,
.platform_data = &lms283_pdata,
.max_speed_hz = 400000,
.bus_num = 2,
.chip_select = 0,
@ -615,6 +618,7 @@ static void __init z2_spi_init(void)
{
pxa2xx_set_spi_info(1, &pxa_ssp1_master_info);
pxa2xx_set_spi_info(2, &pxa_ssp2_master_info);
gpiod_add_lookup_table(&lms283_gpio_table);
spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
}
#else

43
drivers/video/backlight/lms283gf05.c
View File

@ -9,16 +9,16 @@
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/lcd.h>
#include <linux/spi/spi.h>
#include <linux/spi/lms283gf05.h>
#include <linux/module.h>
struct lms283gf05_state {
struct spi_device *spi;
struct lcd_device *ld;
struct gpio_desc *reset;
};
struct lms283gf05_seq {
@ -90,13 +90,13 @@ static const struct lms283gf05_seq disp_pdwnseq[] = {
};
static void lms283gf05_reset(unsigned long gpio, bool inverted)
static void lms283gf05_reset(struct gpio_desc *gpiod)
{
gpio_set_value(gpio, !inverted);
gpiod_set_value(gpiod, 0); /* De-asserted */
mdelay(100);
gpio_set_value(gpio, inverted);
gpiod_set_value(gpiod, 1); /* Asserted */
mdelay(20);
gpio_set_value(gpio, !inverted);
gpiod_set_value(gpiod, 0); /* De-asserted */
mdelay(20);
}
@ -125,18 +125,15 @@ static int lms283gf05_power_set(struct lcd_device *ld, int power)
{
struct lms283gf05_state *st = lcd_get_data(ld);
struct spi_device *spi = st->spi;
struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
if (power <= FB_BLANK_NORMAL) {
if (pdata)
lms283gf05_reset(pdata->reset_gpio,
pdata->reset_inverted);
if (st->reset)
lms283gf05_reset(st->reset);
lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
} else {
lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
if (pdata)
gpio_set_value(pdata->reset_gpio,
pdata->reset_inverted);
if (st->reset)
gpiod_set_value(st->reset, 1); /* Asserted */
}
return 0;
@ -150,24 +147,18 @@ static struct lcd_ops lms_ops = {
static int lms283gf05_probe(struct spi_device *spi)
{
struct lms283gf05_state *st;
struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
struct lcd_device *ld;
int ret = 0;
if (pdata != NULL) {
ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
GPIOF_DIR_OUT | (!pdata->reset_inverted ?
GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
"LMS283GF05 RESET");
if (ret)
return ret;
}
st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
GFP_KERNEL);
if (st == NULL)
return -ENOMEM;
st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(st->reset))
return PTR_ERR(st->reset);
gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");
ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
&lms_ops);
if (IS_ERR(ld))
@ -179,8 +170,8 @@ static int lms283gf05_probe(struct spi_device *spi)
spi_set_drvdata(spi, st);
/* kick in the LCD */
if (pdata)
lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
if (st->reset)
lms283gf05_reset(st->reset);
lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
return 0;

16
include/linux/spi/lms283gf05.h
View File

@ -1,16 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* lms283gf05.h - Platform glue for Samsung LMS283GF05 LCD
*
* Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
*/
#ifndef _INCLUDE_LINUX_SPI_LMS283GF05_H_
#define _INCLUDE_LINUX_SPI_LMS283GF05_H_
struct lms283gf05_pdata {
unsigned long reset_gpio;
bool reset_inverted;
};
#endif /* _INCLUDE_LINUX_SPI_LMS283GF05_H_ */