Re: [PATCH 2/3] watchdog: xilinx: Setup the origin compatible string

[Guenter Roeck <linux@roeck-us.net>]

On Thu, May 30, 2013 at 02:26:03PM +0200, Michal Simek wrote:
> Watchdog 1.01.a is also compatible with 1.00.a.
> Setup the origin version to compatible list.
> If you want to use newer watchdog version, please
> extend your compatible list.
> 
> For example:
> compatible = "xlnx,xps-timebase-wdt-1.02.a", "xlnx,xps-timebase-wdt-1.00.a";
> 
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
>  drivers/watchdog/of_xilinx_wdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
> index d4a35ab..79f358c 100644
> --- a/drivers/watchdog/of_xilinx_wdt.c
> +++ b/drivers/watchdog/of_xilinx_wdt.c
> @@ -384,7 +384,7 @@ static int xwdt_remove(struct platform_device *dev)
> 
>  /* Match table for of_platform binding */
>  static struct of_device_id xwdt_of_match[] = {
> -	{ .compatible = "xlnx,xps-timebase-wdt-1.01.a", },
> +	{ .compatible = "xlnx,xps-timebase-wdt-1.00.a", },

Is this really a good idea ? It means every existing device tree binding which
specifies 1.01a will now fail. If the code is compatible to 1.00a, I think it
would make more sense to add that to the driver as additional entry instead of
deleting the existing entry for 1.01a.

Thanks,
Guenter