linux-kernel - Re: [PATCH v2 1/6] GPIO: xilinx: Simplify driver probe function

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Date:	Mon, 17 Jun 2013 07:25:08 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/6] GPIO: xilinx: Simplify driver probe function

Hi Linus,

can you please look at this?

Thanks,
Michal


On 06/03/2013 02:31 PM, Michal Simek wrote:
> Simplification is done by using OF helper function
> which increase readability of code and remove
> (if (var) var = be32_to_cpup;) assignment.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> Changes in v2:
> - New patch in this series
> 
>  drivers/gpio/gpio-xilinx.c | 24 ++++++++++--------------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index 9ae7aa8..2aad534 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -170,24 +170,20 @@ static int xgpio_of_probe(struct device_node *np)
>  		return -ENOMEM;
> 
>  	/* Update GPIO state shadow register with default value */
> -	tree_info = of_get_property(np, "xlnx,dout-default", NULL);
> -	if (tree_info)
> -		chip->gpio_state = be32_to_cpup(tree_info);
> +	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state);
> +
> +	/* By default, all pins are inputs */
> +	chip->gpio_dir = 0xFFFFFFFF;
> 
>  	/* Update GPIO direction shadow register with default value */
> -	chip->gpio_dir = 0xFFFFFFFF; /* By default, all pins are inputs */
> -	tree_info = of_get_property(np, "xlnx,tri-default", NULL);
> -	if (tree_info)
> -		chip->gpio_dir = be32_to_cpup(tree_info);
> +	of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir);
> +
> +	/* By default assume full GPIO controller */
> +	chip->mmchip.gc.ngpio = 32;
> 
>  	/* Check device node and parent device node for device width */
> -	chip->mmchip.gc.ngpio = 32; /* By default assume full GPIO controller */
> -	tree_info = of_get_property(np, "xlnx,gpio-width", NULL);
> -	if (!tree_info)
> -		tree_info = of_get_property(np->parent,
> -					    "xlnx,gpio-width", NULL);
> -	if (tree_info)
> -		chip->mmchip.gc.ngpio = be32_to_cpup(tree_info);
> +	of_property_read_u32(np, "xlnx,gpio-width",
> +			      (u32 *)&chip->mmchip.gc.ngpio);
> 
>  	spin_lock_init(&chip->gpio_lock);
> 
> --
> 1.8.2.3
> 


-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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