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

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Date:	Thu, 30 May 2013 07:00:41 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	linux-kernel@...r.kernel.org, Michal Simek <monstr@...str.eu>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 2/3] watchdog: xilinx: Setup the origin compatible string

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@...inx.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
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