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

From: Michal Simek
Date: Mon Jun 17 2013 - 01:25:19 EST


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@xxxxxxxxxx>
> ---
> 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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