linux-kernel - Re: [PATCH] dt-bindings: PCI: qcom: Fix register maps items and add 3.3V supply

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Date: Tue, 4 Jun 2024 17:58:06 -0600
From: Rob Herring <robh@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: PCI: qcom: Fix register maps items and add
 3.3V supply

On Tue, Jun 04, 2024 at 07:05:12PM +0300, Abel Vesa wrote:
> All PCIe controllers found on X1E80100 have MHI register region and
> VDDPE supplies. Add them to the schema as well.
> 
> Fixes: 692eadd51698 ("dt-bindings: PCI: qcom: Document the X1E80100 PCIe Controller")
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
> This patchset fixes the following warning:
> https://lore.kernel.org/all/171751454535.785265.18156799252281879515.robh@kernel.org/
> 
> Also fixes a MHI reg region warning that will be triggered by the following patch:
> https://lore.kernel.org/all/20240604-x1e80100-dts-fixes-pcie6a-v2-1-0b4d8c6256e5@linaro.org/
> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml
> index 1074310a8e7a..7ceba32c4cf9 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml
> @@ -19,11 +19,10 @@ properties:
>      const: qcom,pcie-x1e80100
>  
>    reg:
> -    minItems: 5
> +    minItems: 6
>      maxItems: 6
>  
>    reg-names:
> -    minItems: 5
>      items:
>        - const: parf # Qualcomm specific registers
>        - const: dbi # DesignWare PCIe registers
> @@ -71,6 +70,9 @@ properties:
>        - const: pci # PCIe core reset
>        - const: link_down # PCIe link down reset
>  
> +  vddpe-3v3-supply:
> +    description: A phandle to the PCIe endpoint power supply

TBC, this is a rail on the host side provided to a card? If so, we have 
standard properties for standard PCI voltage rails. It is also preferred 
that you put them in a root port node rather than the host bridge.

Rob