linux-kernel - Re: [PATCH RESEND v2] video: fbdev: omapfb: lcd_ams

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Message-ID: <3393268.aPIcKqDIFV@z50>
Date:   Tue, 17 Jul 2018 23:40:36 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-fbdev@...r.kernel.org,
        linux-omap@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH RESEND v2] video: fbdev: omapfb: lcd_ams_delta: use GPIO lookup table

Hi,

Please ignore this submission, I'm going to send this patch with two others in 
a single series.

Thanks,
Janusz

On Tuesday, July 17, 2018 6:54:00 PM CEST Janusz Krzysztofik wrote:
> Now as Amstrad Delta board - the only user of this driver - provides
> GPIO lookup tables, switch from GPIO numbers to GPIO descriptors and
> use the table to locate required GPIO pins.
> 
> Declare static variables for storing GPIO descriptors and replace
> gpio_ function calls with their gpiod_ equivalents. Move GPIO lookup
> to the driver probe function so device initialization can be deferred
> instead of aborted if a GPIO pin is not yet available.
> 
> Pin naming used by the driver should be followed while respective GPIO
> lookup table is initialized by a board init code.
> 
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
> ---
> Changelog:
> v2: Remove problematic error code conversion, no longer needed if used
>     on top of commit d08605a64e67 ("ARM: OMAP1: ams-delta: move late
>     devices back to init_machine") and commit 8853daf3b4ac ("gpiolib:
>     Defer on non-DT find_chip_by_name() failure") already in linux-next.
> 
>  drivers/video/fbdev/omap/lcd_ams_delta.c | 55 +++++++++++++-------------------
>  1 file changed, 22 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/video/fbdev/omap/lcd_ams_delta.c b/drivers/video/fbdev/omap/lcd_ams_delta.c
> index e8c748a0dfe2..cddbd00cbf9f 100644
> --- a/drivers/video/fbdev/omap/lcd_ams_delta.c
> +++ b/drivers/video/fbdev/omap/lcd_ams_delta.c
> @@ -24,11 +24,10 @@
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
>  #include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/lcd.h>
> -#include <linux/gpio.h>
>  
>  #include <mach/hardware.h>
> -#include <mach/board-ams-delta.h>
>  
>  #include "omapfb.h"
>  
> @@ -41,6 +40,8 @@
>  /* LCD class device section */
>  
>  static int ams_delta_lcd;
> +static struct gpio_desc *gpiod_vblen;
> +static struct gpio_desc *gpiod_ndisp;
>  
>  static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
>  {
> @@ -99,41 +100,17 @@ static struct lcd_ops ams_delta_lcd_ops = {
>  
>  /* omapfb panel section */
>  
> -static const struct gpio _gpios[] = {
> -	{
> -		.gpio	= AMS_DELTA_GPIO_PIN_LCD_VBLEN,
> -		.flags	= GPIOF_OUT_INIT_LOW,
> -		.label	= "lcd_vblen",
> -	},
> -	{
> -		.gpio	= AMS_DELTA_GPIO_PIN_LCD_NDISP,
> -		.flags	= GPIOF_OUT_INIT_LOW,
> -		.label	= "lcd_ndisp",
> -	},
> -};
> -
> -static int ams_delta_panel_init(struct lcd_panel *panel,
> -		struct omapfb_device *fbdev)
> -{
> -	return gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
> -}
> -
> -static void ams_delta_panel_cleanup(struct lcd_panel *panel)
> -{
> -	gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
> -}
> -
>  static int ams_delta_panel_enable(struct lcd_panel *panel)
>  {
> -	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1);
> -	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1);
> +	gpiod_set_value(gpiod_ndisp, 1);
> +	gpiod_set_value(gpiod_vblen, 1);
>  	return 0;
>  }
>  
>  static void ams_delta_panel_disable(struct lcd_panel *panel)
>  {
> -	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0);
> -	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0);
> +	gpiod_set_value(gpiod_vblen, 0);
> +	gpiod_set_value(gpiod_ndisp, 0);
>  }
>  
>  static struct lcd_panel ams_delta_panel = {
> @@ -154,8 +131,6 @@ static struct lcd_panel ams_delta_panel = {
>  	.pcd		= 0,
>  	.acb		= 37,
>  
> -	.init		= ams_delta_panel_init,
> -	.cleanup	= ams_delta_panel_cleanup,
>  	.enable		= ams_delta_panel_enable,
>  	.disable	= ams_delta_panel_disable,
>  };
> @@ -166,9 +141,23 @@ static struct lcd_panel ams_delta_panel = {
>  static int ams_delta_panel_probe(struct platform_device *pdev)
>  {
>  	struct lcd_device *lcd_device = NULL;
> -#ifdef CONFIG_LCD_CLASS_DEVICE
>  	int ret;
>  
> +	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
> +	if (IS_ERR(gpiod_vblen)) {
> +		ret = PTR_ERR(gpiod_vblen);
> +		dev_err(&pdev->dev, "VBLEN GPIO request failed (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
> +	if (IS_ERR(gpiod_ndisp)) {
> +		ret = PTR_ERR(gpiod_ndisp);
> +		dev_err(&pdev->dev, "NDISP GPIO request failed (%d)\n", ret);
> +		return ret;
> +	}
> +
> +#ifdef CONFIG_LCD_CLASS_DEVICE
>  	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
>  						&ams_delta_lcd_ops);
>  
>