linux-kernel - Re: [PATCH v2 2/8] dt-bindings: PCI: renesas-pci-usb: Convert bindings to json-schema

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Message-ID: <CAMuHMdUhr7emtsxoxGP5EH2EzNK=PM_7+-32cesecjQjoW1ryQ@mail.gmail.com>
Date:   Thu, 14 Apr 2022 10:28:47 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Herve Codina <herve.codina@...tlin.com>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Clement Leger <clement.leger@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: [PATCH v2 2/8] dt-bindings: PCI: renesas-pci-usb: Convert
 bindings to json-schema

Hi Hervé,

On Thu, Apr 14, 2022 at 9:40 AM Herve Codina <herve.codina@...tlin.com> wrote:
> Convert Renesas PCI bridge bindings documentation to json-schema.
> Also name it 'renesas,pci-usb' as it is specifically used to
> connect the PCI USB controllers to AHB bus.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

Thanks a lot for tackling this DT binding file!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> @@ -0,0 +1,134 @@
> +# SPDX-License-Identifier: GPL-2.0

scripts/checkpatch.pl says:
WARNING: DT binding documents should be licensed (GPL-2.0-only OR BSD-2-Clause)

> +  reg:
> +    description: |
> +      A list of physical regions to access the device. The first is
> +      the operational registers for the OHCI/EHCI controllers and the
> +      second is for the bridge configuration and control registers.
> +    minItems: 2
> +    maxItems: 2

reg:
  items:
    - description: Operational registers for the OHCI/EHCI controllers.
    - description: Bridge configuration and control registers.

> +
> +  interrupts:
> +    description: Interrupt for the device.

maxItems: 1

The description is not needed.

> +
> +  interrupt-map:
> +    description: |
> +      Standard property used to define the mapping of the PCI interrupts
> +      to the GIC interrupts.
> +
> +  interrupt-map-mask:
> +    description:
> +      Standard property that helps to define the interrupt mapping.
> +
> +  clocks:
> +    description: The reference to the device clock.

maxItems: 1

The description is not needed.

Missing "resets" and "power-domains" properties.

Missing description of the child nodes.

> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-map
> +  - interrupt-map-mask
> +  - clocks

Missing "resets" and "power-domains".

> +  - bus-range
> +  - "#address-cells"
> +  - "#size-cells"
> +  - "#interrupt-cells"
> +
> +unevaluatedProperties: false

Why doesn't "make dtbs_check" complain about the presence of
e.g. "resets" in the actual DTS files?

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/r8a7790-cpg-mssr.h>
> +
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;

I think you should drop this (and the corresponding high addresses
below).

> +
> +        pci0: pci@...90000  {
> +            compatible = "renesas,pci-r8a7790", "renesas,pci-rcar-gen2";
> +            device_type = "pci";
> +            clocks = <&cpg CPG_MOD 703>;
> +            reg = <0 0xee090000 0 0xc00>,
> +                  <0 0xee080000 0 0x1100>;
> +            interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;

                        power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
                        resets = <&cpg 703>;

> +            status = "disabled";
> +
> +            bus-range = <0 0>;
> +            #address-cells = <3>;
> +            #size-cells = <2>;
> +            #interrupt-cells = <1>;
> +            ranges = <0x02000000 0 0xee080000 0 0xee080000 0 0x00010000>;
> +            dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000>;
> +            interrupt-map-mask = <0xf800 0 0 0x7>;
> +            interrupt-map = <0x0000 0 0 1 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
> +                            <0x0800 0 0 1 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
> +                            <0x1000 0 0 2 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
> +
> +            usb@1,0 {
> +                reg = <0x800 0 0 0 0>;
> +                phys = <&usb0 0>;
> +                phy-names = "usb";
> +            };
> +

ERROR: trailing whitespace
#249: FILE: Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml:127:
+            $

> +            usb@2,0 {
> +                reg = <0x1000 0 0 0 0>;
> +                phys = <&usb0 0>;
> +                phy-names = "usb";
> +            };
> +        };
> +    };

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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