On 4/2/24 16:33, Krzysztof Kozlowski wrote: > On 02/04/2024 01:36, Damien Le Moal wrote: >> On 4/1/24 18:57, Krzysztof Kozlowski wrote: >>> On 01/04/2024 01:06, Damien Le Moal wrote: >>>> On 3/30/24 18:16, Krzysztof Kozlowski wrote: >>>>> On 30/03/2024 05:19, Damien Le Moal wrote: >>>>>> From: Wilfred Mallawa <wilfred.mallawa@xxxxxxx> >>>>>> >>>>>> Describe the `ep-gpios` property which is used to map the PERST# input >>>>>> signal for endpoint mode. >>>>>> >>>>>> Signed-off-by: Wilfred Mallawa <wilfred.mallawa@xxxxxxx> >>>>>> Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx> >>>>>> --- >>>>>> .../devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml | 3 +++ >>>>>> 1 file changed, 3 insertions(+) >>>>>> >>>>>> diff --git a/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml >>>>>> index 6b62f6f58efe..9331d44d6963 100644 >>>>>> --- a/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml >>>>>> +++ b/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml >>>>>> @@ -30,6 +30,9 @@ properties: >>>>>> maximum: 32 >>>>>> default: 32 >>>>>> >>>>>> + ep-gpios: >>>>>> + description: Input GPIO configured for the PERST# signal. >>>>> >>>>> Missing maxItems. But more important: why existing property perst-gpios, >>>>> which you already have there in common schema, is not correct for this case? >>>> >>>> I am confused... Where do you find perst-gpios defined for the rk3399 ? >>>> Under Documentation/devicetree/bindings/pci/, the only schema I see using >>>> perst-gpios property are for the qcom (Qualcomm) controllers. >>> >>> You are right, it's so far only in Qualcomm. >>> >>>> The RC bindings for the rockchip rk3399 PCIe controller >>>> (pci/rockchip,rk3399-pcie.yaml) already define the ep-gpios property. So if >>> >>> Any reason why this cannot be named like GPIO? Is there already a user >>> of this in Linux kernel? Commit msg says nothing about this, so that's >>> why I would expect name matching the signal. >> >> The RC-mode PCIe controller node of the rk3399 DTS already defines the ep-gpios >> property for RC side PERST# signal handling. So we simply reused the exact same >> name to be consistent between RC and EP. I personnally have no preferences. If >> there is an effort to rename such signal with some preferred pattern, I will >> follow. For the EP node, there was no PERST signal handling in the driver and >> no property defined for it, so any name is fine. "perst-gpios" would indeed be >> a better name, but again, given that the RC controller node has ep-gpios, we >> reused that. What is your recommendation here ? > > Actually I don't know, perst and ep would work for me. If you do not > have code for this in the driver yet (nothing is shared between ep and > host), then maybe let's go with perst to match the actual name. That works for me. The other simple solution would be to move the RC node ep-gpios description to the common schema pci/rockchip,rk3399-pcie-common.yaml, maybe ? Otherwise, perst-gpios like the Qualcomm schemas would be nice too. > > Anyway, you need maxItems. I sent a patch for the other binding: > https://lore.kernel.org/all/20240401100058.15749-1-krzysztof.kozlowski@xxxxxxxxxx/ Thanks for that. > > Best regards, > Krzysztof > -- Damien Le Moal Western Digital Research
