[PATCH 10/21] drm/omap: panel-tpo-td043mtea1: Convert to the GPIO descriptors API

[Sebastian Reichel]

Hi,

On Wed, Jun 06, 2018 at 12:36:39PM +0300, Laurent Pinchart wrote:
> 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 at ideasonboard.com>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel at collabora.co.uk>

-- Sebastian

>  .../drm/omapdrm/displays/panel-tpo-td043mtea1.c    | 52 ++++++----------------
>  1 file changed, 14 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c
> index 34531169c166..1521812ab15b 100644
> --- a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c
> +++ b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c
> @@ -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");
> -- 
> Regards,
> 
> Laurent Pinchart
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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