Re: [PATCH v5 2/5] dt-bindings: net: wireless: brcm4329-fmac: add clock description for AP6275P

[Krzysztof Kozlowski]

On 30/07/2024 08:37, Arend Van Spriel wrote:
> + Linus W
> 
> On July 30, 2024 5:31:15 AM Jacobe Zang <jacobe.zang@xxxxxxxxxx> wrote:
> 
>> Not only AP6275P Wi-Fi device but also all Broadcom wireless devices allow
>> external low power clock input. In DTS the clock as an optional choice in
>> the absence of an internal clock.
>>
>> Reviewed-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
>> Signed-off-by: Jacobe Zang <jacobe.zang@xxxxxxxxxx>
>> ---
>> .../bindings/net/wireless/brcm,bcm4329-fmac.yaml          | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml 
>> b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
>> index 2c2093c77ec9a..a3607d55ef367 100644
>> --- a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
>> @@ -122,6 +122,14 @@ properties:
>> NVRAM. This would normally be filled in by the bootloader from platform
>> configuration data.
>>
>> +  clocks:
>> +    items:
>> +      - description: External Low Power Clock input (32.768KHz)
>> +
>> +  clock-names:
>> +    items:
>> +      - const: lpo
>> +
> 
> We still have an issue that this clock input is also present in the 
> bindings specification broadcom-bluetooth.yaml (not in bluetooth 
> subfolder). This clock is actually a chip resource. What happens if both 
> are defined and both wifi and bt drivers try to enable this clock? Can this 
> be expressed in yaml or can we only put a textual warning in the property 
> descriptions?

Just like all clocks, what would happen? It will be enabled.

Best regards,
Krzysztof