[PATCH 1/4] PCI: of: Add of_pci_clkreq_present()

[Shawn Lin]

Hi Mani

在 2025/10/22 星期三 18:02, Manivannan Sadhasivam 写道:
> On Tue, Oct 21, 2025 at 03:48:24PM +0800, Shawn Lin wrote:
>> of_pci_clkreq_present() is used by host drivers to decide whether the clkreq#
>> is properly connected and could enable L1.1/L1.2 support.
>>
>> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
>> ---
>>   drivers/pci/of.c  | 18 ++++++++++++++++++
>>   drivers/pci/pci.h |  6 ++++++
>>   2 files changed, 24 insertions(+)
>>
>> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
>> index 3579265f1198..52c6d365083b 100644
>> --- a/drivers/pci/of.c
>> +++ b/drivers/pci/of.c
>> @@ -1010,3 +1010,21 @@ int of_pci_get_equalization_presets(struct device *dev,
>>   	return 0;
>>   }
>>   EXPORT_SYMBOL_GPL(of_pci_get_equalization_presets);
>> +
>> +/**
>> + * of_pci_clkreq_present() - Check if the "supports-clkreq" is present
> 
> I don't see a benefit of this API, tbh. The API name creates an impression that
> the API will check for the presence of CLKREQ# signal in DT, but it checks
> for the presence of the 'supports-clkreq' property. Even though the presence of
> the property implies that the CLKREQ# routing is available, I'd prefer to check
> for the property explicitly instead of hiding it inside this API.

It makes sense.

Will the name of_pci_supports_clkreq_present() look good? Or we just
drop it and let host drivers to explicitly check supports-clkreq inside
their code?


> 
> - Mani
>