Re: [PATCH v5 09/16] pwm: tegra: Add device tree support

[Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>]

On 04/02/2012 02:37 AM, Thierry Reding wrote:
> * Stephen Warren wrote:
>> On 03/28/2012 08:33 AM, Thierry Reding wrote:
>>> Add auxdata to instantiate the PWFM controller from a device tree,
>>> include the corresponding nodes in the dtsi files for Tegra 20 and
>>> Tegra 30 and add binding documentation.
>>>
>>> Signed-off-by: Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
>>> Acked-by: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
>>
>>> diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
>> ...
>>> +#ifdef CONFIG_OF
>>> +static struct of_device_id tegra_pwm_of_match[] = {
>>> +	{ .compatible = "nvidia,tegra20-pwm" },
>>> +	{ .compatible = "nvidia,tegra30-pwm" },
>>
>> Could you swap those two lines, so that tegra30-pwm matches first. It
>> makes no difference at present, but might in the future if the driver
>> actually has to differentiate the two SoCs.
> 
> I thought the matching order was determined by the compatible property in the
> device tree, not the OF match table of the driver.

At least logically, yes. However, of_match_device() appears to iterate
over each match table entry, checking whether it matches any string in
the compatible flag. Perhaps this could be considered a bug?