linux-kernel - RE: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset

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Date:	Fri, 06 Jan 2012 11:16:06 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Thomas Abraham' <thomas.abraham@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	rpurdie@...ys.net, linux-samsung-soc@...r.kernel.org,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	kgene.kim@...sung.com, broonie@...nsource.wolfsonmicro.com,
	kyungmin.park@...sung.com, cbou@...l.ru, kwangwoo.lee@...il.com,
	augulis.darius@...il.com, ben-linux@...ff.org, lars@...afoo.de,
	patches@...aro.org
Subject: RE: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio
 controlled panel reset

Hi, Thomas.
> -----Original Message-----
> From: Thomas Abraham [mailto:thomas.abraham@...aro.org]
> Sent: Friday, January 06, 2012 12:42 AM
> Subject: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset
> 
> Add a lcd panel driver for simple raster-type lcd's which uses a gpio
> controlled panel reset. The driver controls the nRESET line of the panel
> using a gpio connected from the host system. The Vcc supply to the panel
> is (optionally) controlled using a voltage regulator. This driver excludes
> support for lcd panels that use a serial command interface or direct
> memory mapped IO interface.
> 
> Suggested-by: Lars-Peter Clausen <lars@...afoo.de>
> Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
> ---
>  .../devicetree/bindings/lcd/lcd-pwrctrl.txt        |   39 ++++
>  drivers/video/backlight/Kconfig                    |    7 +
>  drivers/video/backlight/Makefile                   |    1 +
>  drivers/video/backlight/lcd_pwrctrl.c              |  231 ++++++++++++++++++++
>  include/video/lcd_pwrctrl.h                        |   30 +++
>  5 files changed, 308 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/lcd/lcd-pwrctrl.txt
>  create mode 100644 drivers/video/backlight/lcd_pwrctrl.c
>  create mode 100644 include/video/lcd_pwrctrl.h
> 
> [...]
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_LCD_LMS283GF05)	   += lms283gf05.o
>  obj-$(CONFIG_LCD_LTV350QV)	   += ltv350qv.o
>  obj-$(CONFIG_LCD_ILI9320)	   += ili9320.o
>  obj-$(CONFIG_LCD_PLATFORM)	   += platform_lcd.o
> +obj-$(CONFIG_LCD_PWRCTRL) 	   += lcd_pwrctrl.o
Can you remove unnecessary space?
Please use <tab><space><space><space> instead of <space><tab><space><space><space>
between PWRCTRL) and += lcd_.
> [...]
> +static struct platform_driver lcd_pwrctrl_driver = {
> +	.driver		= {
> +		.name	= "lcd-pwrctrl",
> +		.owner	= THIS_MODULE,
> +		.of_match_table	= of_match_ptr(lcd_pwrctrl_match),
> +	},
> +	.probe		= lcd_pwrctrl_probe,
> +	.remove		= lcd_pwrctrl_remove,
> +	.suspend	= lcd_pwrctrl_suspend,
> +	.resume		= lcd_pwrctrl_resume,
Please use 'struct dev_pm_ops'.
> +};
> +
> +static int __init lcd_pwrctrl_init(void)
> +{
> +	return platform_driver_register(&lcd_pwrctrl_driver);
> +}
> +
> +static void __exit lcd_pwrctrl_cleanup(void)
> +{
> +	platform_driver_unregister(&lcd_pwrctrl_driver);
> +}
> +
> +module_init(lcd_pwrctrl_init);
> +module_exit(lcd_pwrctrl_cleanup);
Use module_platform_driver(lcd_pwrctrl_driver).
It can make the code simpler.
> [...]

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