Re: [PATCH v20 15/19] dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Endpoint

From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: jingoohan1@gmail.com, gustavo.pimentel@synopsys.com,
	lpieralisi@kernel.org, robh+dt@kernel.org, kw@linux.com,
	manivannan.sadhasivam@linaro.org, bhelgaas@google.com,
	kishon@kernel.org, krzysztof.kozlowski+dt@linaro.org,
	conor+dt@kernel.org, marek.vasut+renesas@gmail.com,
	fancer.lancer@gmail.com, linux-pci@vger.kernel.org,
	devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	Rob Herring <robh@kernel.org>,
	Manivannan Sadhasivam <mani@kernel.org>
Subject: Re: [PATCH v20 15/19] dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Endpoint
Date: Thu, 31 Aug 2023 15:16:33 +0200	[thread overview]
Message-ID: <CAMuHMdV5NEJFSmL6Ey6TwSaaX4Mj5k3C9_UP0psyijeaLVCEPw@mail.gmail.com> (raw)
In-Reply-To: <20230825093219.2685912-16-yoshihiro.shimoda.uh@renesas.com>

Hi Shimoda-san,

On Fri, Aug 25, 2023 at 3:57 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> Document bindings for Renesas R-Car Gen4 and R-Car S4-8 (R8A779F0)
> PCIe endpoint module.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
> Acked-by: Manivannan Sadhasivam <mani@kernel.org>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
> @@ -0,0 +1,106 @@

> +  resets:
> +    maxItems: 1

Missing reset-names, cfr.
Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml

> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - resets
> +  - power-domains
> +  - clocks
> +  - clock-names

Missing reset-names.

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r8a779f0-cpg-mssr.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/power/r8a779f0-sysc.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        pcie0_ep: pcie-ep@e65d0000 {
> +            compatible = "renesas,r8a779f0-pcie-ep", "renesas,rcar-gen4-pcie-ep";
> +            reg = <0 0xe65d0000 0 0x2000>, <0 0xe65d2800 0 0x0800>,

<0 0xe65d2800 0 0x0800> does not match your DTS patch
https://lore.kernel.org/linux-renesas-soc/20230828041434.2747699-2-yoshihiro.shimoda.uh@renesas.com

> +                  <0 0xe65d3000 0 0x2000>, <0 0xe65d5000 0 0x1200>,
> +                  <0 0xe65d6200 0 0x0e00>, <0 0xfe000000 0 0x400000>;
> +            reg-names = "dbi", "dbi2", "atu", "dma", "app", "addr_space";
> +            interrupts = <GIC_SPI 417 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 418 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 422 IRQ_TYPE_LEVEL_HIGH>;

What about SPI 419, 420, 421?

> +            interrupt-names = "dma", "sft_ce", "app";
> +            clocks = <&cpg CPG_MOD 624>, <&pcie0_clkref>;
> +            clock-names = "core", "ref";
> +            power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
> +            resets = <&cpg 624>;
> +            num-lanes = <2>;
> +            max-link-speed = <4>;
> +            max-functions = /bits/ 8 <2>;
> +        };
> +    };

BTW, I think it would be good to make the order of the properties and
in the example match between the host and endpoint bindings, to make
the output of
"diff Documentation/devicetree/bindings/pci/rcar-gen4-pci-{host,ep}.yaml"
as small as possible.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds