[v3,1/3] dt-bindings: pwm: Fix node name pattern

It looks like it was intended to allow two types of node names with the
binding:

 - With unit address, e.g. pwm@1f000000
 - With a suffix, e.g. pwm-clk

However the pattern regex only correctly matches the first variant,
as well as some incorrect ones.

Fix the regex to match only two patterns shown above. (Either unit
address starting with @ and following with one or more hexademical
digit or arbitrary suffix stating with - and at least one symbol long)

Fixes: 89650a1e3b6f ("dt-bindings: pwm: Convert PWM bindings to json-schema")
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
 Documentation/devicetree/bindings/pwm/pwm.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Rob Herring писал(а) 21.01.2022 00:15:
> On Thu, Jan 20, 2022 at 09:14:40PM +0500, Nikita Travkin wrote:
>> It looks like it was intended to allow two types of node names with the
>> binding:
>>
>>  - With unit address, e.g. pwm@1f000000
> 
> Yes, but the format of the unit-address is up to the parent bus which is 
> outside the scope of this binding.
> 
>>  - With a suffix, e.g. pwm-clk
> 
> No. pwm-0, pwm-1, etc. only to cover the few cases with no unit-address. 
> 
> Third is just 'pwm' as the '*' on the end means 0 or more. Though a '?' 
> would have been more correct.
> 

Oh, thanks for clarifying that. My assumption was that just numbering
the nodes is not informative enough, but if it's the agreed way to do
it, I will use this format instead.

I will drop this commit and correct the bindings to use 'pwm' with
no suffix as an example. (Though I still think that having a
meaningful suffix is nicer in the DT so one could see what the
node is used for)

Thanks
Nikita

>>
>> However the pattern regex only correctly matches the first variant,
>> as well as some incorrect ones.
>>
>> Fix the regex to match only two patterns shown above. (Either unit
>> address starting with @ and following with one or more hexademical
>> digit or arbitrary suffix stating with - and at least one symbol long)
>>
>> Fixes: 89650a1e3b6f ("dt-bindings: pwm: Convert PWM bindings to json-schema")
>> Signed-off-by: Nikita Travkin <nikita@trvn.ru>
>> ---
>>  Documentation/devicetree/bindings/pwm/pwm.yaml | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/pwm.yaml b/Documentation/devicetree/bindings/pwm/pwm.yaml
>> index 3c01f85029e5..4926fe65886f 100644
>> --- a/Documentation/devicetree/bindings/pwm/pwm.yaml
>> +++ b/Documentation/devicetree/bindings/pwm/pwm.yaml
>> @@ -13,7 +13,7 @@ select: false
>>
>>  properties:
>>    $nodename:
>> -    pattern: "^pwm(@.*|-[0-9a-f])*$"
>> +    pattern: "^pwm(@[0-9a-f]+|-.+)?$"
>>
>>    "#pwm-cells":
>>      description:
>> --
>> 2.30.2
>>
>>