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drm/omap: panel-tpo-td043mtea1: Convert to the GPIO descriptors API

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The GPIO descriptor API is favoured over the plain GPIO API for consumer
drivers. Using it simplifies the driver code.

As the descriptor API handles the active-low flag internally we need to
invert the polarity of all GPIO operations in the driver. Rename the
nreset_gpio field to reset_gpio to reflect that.

The reset GPIO is mandatory, so drop conditional tests through the
driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Laurent Pinchart 2018-05-28 17:18:26 +03:00 committed by Tomi Valkeinen
parent 2167f9e28a
commit e7df657102
1 changed files with 14 additions and 38 deletions
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52
drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c
View File

@ -10,14 +10,13 @@
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio/consumer.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include "../dss/omapdss.h"
@ -59,7 +58,7 @@ struct panel_drv_data {
struct spi_device *spi;
struct regulator *vcc_reg;
int nreset_gpio;
struct gpio_desc *reset_gpio;
u16 gamma[12];
u32 mode;
u32 vmirror:1;
@ -282,8 +281,7 @@ static int tpo_td043_power_on(struct panel_drv_data *ddata)
/* wait for panel to stabilize */
msleep(160);
if (gpio_is_valid(ddata->nreset_gpio))
gpio_set_value(ddata->nreset_gpio, 1);
gpiod_set_value(ddata->reset_gpio, 0);
tpo_td043_write(ddata->spi, 2,
TPO_R02_MODE(ddata->mode) | TPO_R02_NCLK_RISING);
@ -305,8 +303,7 @@ static void tpo_td043_power_off(struct panel_drv_data *ddata)
tpo_td043_write(ddata->spi, 3,
TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
if (gpio_is_valid(ddata->nreset_gpio))
gpio_set_value(ddata->nreset_gpio, 0);
gpiod_set_value(ddata->reset_gpio, 1);
/* wait for at least 2 vsyncs before cutting off power */
msleep(50);
@ -419,26 +416,11 @@ static const struct omap_dss_driver tpo_td043_ops = {
.check_timings = tpo_td043_check_timings,
};
static int tpo_td043_probe_of(struct spi_device *spi)
{
struct device_node *node = spi->dev.of_node;
struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
int gpio;
gpio = of_get_named_gpio(node, "reset-gpios", 0);
if (!gpio_is_valid(gpio)) {
dev_err(&spi->dev, "failed to parse enable gpio\n");
return gpio;
}
ddata->nreset_gpio = gpio;
return 0;
}
static int tpo_td043_probe(struct spi_device *spi)
{
struct panel_drv_data *ddata;
struct omap_dss_device *dssdev;
struct gpio_desc *gpio;
int r;
dev_dbg(&spi->dev, "%s\n", __func__);
@ -460,10 +442,6 @@ static int tpo_td043_probe(struct spi_device *spi)
ddata->spi = spi;
r = tpo_td043_probe_of(spi);
if (r)
return r;
ddata->mode = TPO_R02_MODE_800x480;
memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
@ -473,16 +451,14 @@ static int tpo_td043_probe(struct spi_device *spi)
return PTR_ERR(ddata->vcc_reg);
}
if (gpio_is_valid(ddata->nreset_gpio)) {
r = devm_gpio_request_one(&spi->dev,
ddata->nreset_gpio, GPIOF_OUT_INIT_LOW,
"lcd reset");
if (r < 0) {
dev_err(&spi->dev, "couldn't request reset GPIO\n");
return r;
}
gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(gpio)) {
dev_err(&spi->dev, "failed to get reset gpio\n");
return PTR_ERR(gpio);
}
ddata->reset_gpio = gpio;
r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
if (r) {
dev_err(&spi->dev, "failed to create sysfs files\n");