linux-kernel - Re: [PATCH v4 1/2] dt-bindings: PCI: xilinx-cpm: Add reset-gpios for PCIe RP PERST#

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Message-ID: <afe7947b-ed71-40d0-aa2e-b16549fc6b7d@kernel.org>
Date: Tue, 18 Mar 2025 10:52:37 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sai Krishna Musham <sai.krishna.musham@....com>, bhelgaas@...gle.com,
 lpieralisi@...nel.org, kw@...ux.com, manivannan.sadhasivam@...aro.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, cassel@...nel.org
Cc: linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, michal.simek@....com,
 bharat.kumar.gogada@....com, thippeswamy.havalige@....com
Subject: Re: [PATCH v4 1/2] dt-bindings: PCI: xilinx-cpm: Add reset-gpios for
 PCIe RP PERST#

On 18/03/2025 10:26, Sai Krishna Musham wrote:
> Changes for v2:
> - Add define from include/dt-bindings/gpio/gpio.h for PERST# polarity
> - Update commit message
> ---
>  .../bindings/pci/xilinx-versal-cpm.yaml       | 21 ++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> index d674a24c8ccc..904594138af2 100644
> --- a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> +++ b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> @@ -24,15 +24,20 @@ properties:
>      items:
>        - description: CPM system level control and status registers.
>        - description: Configuration space region and bridge registers.
> +      - description: CPM clock and reset control registers.
>        - description: CPM5 control and status registers.

You cannot add items to the middle, that's an ABI break. Adding required
properties is also an ABI break. Why you cannot add it to the end of the
list?

Or at least explain ABI break impact in commit msg?


> -    minItems: 2
> +    minItems: 3
>  
>    reg-names:
>      items:
>        - const: cpm_slcr
>        - const: cfg
> +      - const: cpm_crx
>        - const: cpm_csr
> -    minItems: 2
> +    minItems: 3
> +
> +  reset-gpios:
> +    description: GPIO used as PERST# signal

Isn't this already in pci-bus-common.yaml?


Best regards,
Krzysztof