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

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Message-ID: <20250224064209.h7te3o3vhcf33alh@thinkpad>
Date: Mon, 24 Feb 2025 12:12:09 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Sai Krishna Musham <sai.krishna.musham@....com>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	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 1/2] dt-bindings: PCI: xilinx-cpm: Add reset-gpios for
 PCIe RP PERST#

On Mon, Feb 24, 2025 at 12:00:45PM +0530, Sai Krishna Musham wrote:
> Introduce `reset-gpios` property to enable GPIO-based control of
> the PCIe RP PERST# signal, generating assert and deassert signals.
> 
> Signed-off-by: Sai Krishna Musham <sai.krishna.musham@....com>
> ---
> This patch depends on the following patch series.
> https://lore.kernel.org/all/20250217072713.635643-2-thippeswamy.havalige@amd.com/
> ---
>  .../devicetree/bindings/pci/xilinx-versal-cpm.yaml          | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> index b63a759ec2d7..293ed36d0cea 100644
> --- a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> +++ b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml
> @@ -33,6 +33,9 @@ properties:
>        - const: cpm_csr
>      minItems: 2
>  
> +  reset-gpios:
> +    description: GPIO used as PERST# signal. Please refer to pci.txt.
> +
>    interrupts:
>      maxItems: 1
>  
> @@ -63,6 +66,7 @@ properties:
>  required:
>    - reg
>    - reg-names
> +  - reset-gpios

This is an ABI break. If you make it required now, old DTS will be broken.

>    - "#interrupt-cells"
>    - interrupts
>    - interrupt-map
> @@ -99,6 +103,7 @@ examples:
>                         reg = <0x0 0xfca10000 0x0 0x1000>,
>                               <0x6 0x00000000 0x0 0x10000000>;
>                         reg-names = "cpm_slcr", "cfg";
> +                       reset-gpios = <&gpio1 38 0x01>;

Please use proper defines in include/dt-bindings/gpio/gpio.h for the GPIO
polarity.

>                         pcie_intc_0: interrupt-controller {
>                                 #address-cells = <0>;
>                                 #interrupt-cells = <1>;
> @@ -127,6 +132,7 @@ examples:
>                               <0x06 0x00000000 0x00 0x1000000>,
>                               <0x00 0xfce20000 0x00 0x1000000>;
>                         reg-names = "cpm_slcr", "cfg", "cpm_csr";
> +                       reset-gpios = <&gpio1 38 0x01>;

Same here.

- Mani

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