linux-kernel - Re: [PATCH v3 06/11] dt-bindings: PCI: Update the RK3399 example to a valid one

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Date:   Tue, 4 Apr 2023 10:45:12 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rick Wertenbroek <rick.wertenbroek@...il.com>,
        alberto.dassatti@...g-vd.ch
Cc:     damien.lemoal@...nsource.wdc.com, xxm@...k-chips.com,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Johan Jonker <jbx6244@...il.com>,
        Brian Norris <briannorris@...omium.org>,
        Caleb Connolly <kc@...tmarketos.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Lin Huang <hl@...k-chips.com>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 06/11] dt-bindings: PCI: Update the RK3399 example to a
 valid one

On 04/04/2023 10:24, Rick Wertenbroek wrote:
> Update the example in the documentation a valid example.
> The default max-outbound-regions is 32 but the example showed 16.

This is not reason to be invalid. It is perfectly fine to change default
values to desired ones. What is not actually obvious is to change some
value to a default one, instead of removing it...

> Address for mem-base was invalid. Added pinctrl.
> 
> Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
> ---
>  .../devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml  | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml
> index 88386a6d7011..0c67e96096eb 100644
> --- a/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml
> +++ b/Documentation/devicetree/bindings/pci/rockchip,rk3399-pcie-ep.yaml
> @@ -47,14 +47,15 @@ examples:
>  
>          pcie-ep@...00000 {
>              compatible = "rockchip,rk3399-pcie-ep";
> -            reg = <0x0 0xfd000000 0x0 0x1000000>, <0x0 0x80000000 0x0 0x20000>;
> -            reg-names = "apb-base", "mem-base";

Reg (and reg-names) is usually second property, why moving it? What is
incorrect in the placement?

> +            rockchip,max-outbound-regions = <32>;
>              clocks = <&cru ACLK_PCIE>, <&cru ACLK_PERF_PCIE>,
>                <&cru PCLK_PCIE>, <&cru SCLK_PCIE_PM>;
>              clock-names = "aclk", "aclk-perf",
>                      "hclk", "pm";
>              max-functions = /bits/ 8 <8>;
>              num-lanes = <4>;
> +            reg = <0x0 0xfd000000 0x0 0x1000000>, <0x0 0xfa000000 0x0 0x2000000>;
> +            reg-names = "apb-base", "mem-base";
>              resets = <&cru SRST_PCIE_CORE>, <&cru SRST_PCIE_MGMT>,
>                <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE> ,
>                <&cru SRST_PCIE_PM>, <&cru SRST_P_PCIE>, <&cru SRST_A_PCIE>;
> @@ -62,7 +63,8 @@ examples:
>                      "pm", "pclk", "aclk";
>              phys = <&pcie_phy 0>, <&pcie_phy 1>, <&pcie_phy 2>, <&pcie_phy 3>;
>              phy-names = "pcie-phy-0", "pcie-phy-1", "pcie-phy-2", "pcie-phy-3";
> -            rockchip,max-outbound-regions = <16>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&pcie_clkreqnb_cpm>;
>          };
>      };
>  ...

Best regards,
Krzysztof