linux-kernel - Re: [PATCH v1 1/4] dt-bindings: imx6q-pcie: Add reg-name "dbi2" and "atu" for i.MX8M PCIe Endpoint

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Message-ID: <20240722-displace-amusable-a884352e0ff9@spud>
Date: Mon, 22 Jul 2024 17:37:14 +0100
From: Conor Dooley <conor@...nel.org>
To: Richard Zhu <hongxing.zhu@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, l.stach@...gutronix.de,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de, imx@...ts.linux.dev
Subject: Re: [PATCH v1 1/4] dt-bindings: imx6q-pcie: Add reg-name "dbi2" and
 "atu" for i.MX8M PCIe Endpoint

On Mon, Jul 22, 2024 at 03:56:16PM +0800, Richard Zhu wrote:
> Add reg-name: "dbi2", "atu" for i.MX8M PCIe Endpoint.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml  | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml
> index a06f75df8458..309e8953dc91 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml
> @@ -65,11 +65,13 @@ allOf:
>      then:
>        properties:
>          reg:
> -          minItems: 2
> -          maxItems: 2
> +          minItems: 4
> +          maxItems: 4
>          reg-names:
>            items:
>              - const: dbi
> +            - const: dbi2
> +            - const: atu

New properties in the middle of the list is potentially an ABI break.
Why not add them at the end?

>              - const: addr_space
>  
>    - if:
> @@ -129,8 +131,11 @@ examples:
>  
>      pcie_ep: pcie-ep@...00000 {
>        compatible = "fsl,imx8mp-pcie-ep";
> -      reg = <0x33800000 0x000400000>, <0x18000000 0x08000000>;
> -      reg-names = "dbi", "addr_space";
> +      reg = <0x33800000 0x100000>,
> +            <0x33900000 0x100000>,
> +            <0x33b00000 0x100000>,
> +            <0x18000000 0x8000000>;
> +      reg-names = "dbi", "dbi2", "atu", "addr_space";
>        clocks = <&clk IMX8MP_CLK_HSIO_ROOT>,
>                 <&clk IMX8MP_CLK_HSIO_AXI>,
>                 <&clk IMX8MP_CLK_PCIE_ROOT>;
> -- 
> 2.37.1
> 

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