RE: [PATCH v20 14/19] dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Host

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Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Thursday, August 31, 2023 10:13 PM
> 
> Hi Shimoda-san,
> 
> On Fri, Aug 25, 2023 at 3:18 PM Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> > Document bindings for Renesas R-Car Gen4 and R-Car S4-8 (R8A779F0)
> > PCIe host module.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
> > Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> 
> Thanks for your patch!

Thank you for your review!

> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
> > @@ -0,0 +1,123 @@
> 
> > +  resets:
> > +    maxItems: 1
> > +
> > +  resets-names:
> 
> reset-names

Oops! I'll fix it.

> > +    items:
> > +      - const: pwr
> > +
> > +  max-link-speed:
> > +    maximum: 4
> > +
> > +  num-lanes:
> > +    maximum: 4
> > +
> > +required:
> > +  - compatible
> > +  - reg
> 
> Missing "reg-names".

I got it. I'll add it.

> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +  - power-domains
> > +  - resets
> > +  - 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>;
> > +
> > +        pcie: pcie@e65d0000 {
> > +            compatible = "renesas,r8a779f0-pcie", "renesas,rcar-gen4-pcie";
> > +            reg = <0 0xe65d0000 0 0x1000>, <0 0xe65d2000 0 0x0800>,
> > +                  <0 0xe65d3000 0 0x2000>, <0 0xe65d5000 0 0x1200>,
> > +                  <0 0xe65d6200 0 0x0e00>, <0 0xfe000000 0 0x400000>;
> 
> The lenght "0x0e00" does not match your DTS patch
<snip URL>

It seemed my DTS patch was not correct. Also, as you mentioned on the other email [1],
I should add a reg for "phy". I'll revise the dt-bindings doc.
https://lore.kernel.org/all/CAMuHMdWrrwwY=8bySDVYc9jD9zdKbeNytDVUSm7vci6LN=g6Qg@xxxxxxxxxxxxxx/

> 
> > +            reg-names = "dbi", "dbi2", "atu", "dma", "app", "config";
> > +            #address-cells = <3>;
> > +            #size-cells = <2>;
> > +            bus-range = <0x00 0xff>;
> > +            device_type = "pci";
> > +            ranges = <0x01000000 0 0x00000000 0 0xfe000000 0 0x00400000>,
> > +                     <0x02000000 0 0x30000000 0 0x30000000 0 0x10000000>;
> > +            dma-ranges = <0x42000000 0 0x00000000 0 0x00000000 1 0x00000000>;
> > +            interrupts = <GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                         <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?

These SPI interrupts cannot match the Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml.
Also, I cannot describe the detail of these SPI interrupts behavior because of the datasheet
doesn't mention the detail... So, I didn't describe them.

> > +            interrupt-names = "msi", "dma", "sft_ce", "app";
> > +            #interrupt-cells = <1>;
> > +            interrupt-map-mask = <0 0 0 7>;
> > +            interrupt-map = <0 0 0 1 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 2 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 3 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 4 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>;
> > +            clocks = <&cpg CPG_MOD 624>, <&clkref>;
> > +            clock-names = "core", "ref";
> > +            power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
> > +            resets = <&cpg 624>;
> > +            reset-names = "pwr";
> > +            num-lanes = <2>;
> > +            snps,enable-cdm-check;
> > +            max-link-speed = <4>;
> > +        };
> > +    };
> 
> 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.

Thank you for your suggestion! I'll revise the dt-bindings doc.

Best regards,
Yoshihiro Shimoda

> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> 
> 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
> 
> 
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +  - power-domains
> > +  - resets
> > +  - 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>;
> > +
> > +        pcie: pcie@e65d0000 {
> > +            compatible = "renesas,r8a779f0-pcie", "renesas,rcar-gen4-pcie";
> > +            reg = <0 0xe65d0000 0 0x1000>, <0 0xe65d2000 0 0x0800>,
> > +                  <0 0xe65d3000 0 0x2000>, <0 0xe65d5000 0 0x1200>,
> > +                  <0 0xe65d6200 0 0x0e00>, <0 0xfe000000 0 0x400000>;
> > +            reg-names = "dbi", "dbi2", "atu", "dma", "app", "config";
> > +            #address-cells = <3>;
> > +            #size-cells = <2>;
> > +            bus-range = <0x00 0xff>;
> > +            device_type = "pci";
> > +            ranges = <0x01000000 0 0x00000000 0 0xfe000000 0 0x00400000>,
> > +                     <0x02000000 0 0x30000000 0 0x30000000 0 0x10000000>;
> > +            dma-ranges = <0x42000000 0 0x00000000 0 0x00000000 1 0x00000000>;
> > +            interrupts = <GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                         <GIC_SPI 417 IRQ_TYPE_LEVEL_HIGH>,
> > +                         <GIC_SPI 418 IRQ_TYPE_LEVEL_HIGH>,
> > +                         <GIC_SPI 422 IRQ_TYPE_LEVEL_HIGH>;
> > +            interrupt-names = "msi", "dma", "sft_ce", "app";
> > +            #interrupt-cells = <1>;
> > +            interrupt-map-mask = <0 0 0 7>;
> > +            interrupt-map = <0 0 0 1 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 2 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 3 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <0 0 0 4 &gic GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH>;
> > +            clocks = <&cpg CPG_MOD 624>, <&clkref>;
> > +            clock-names = "core", "ref";
> > +            power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
> > +            resets = <&cpg 624>;
> > +            reset-names = "pwr";
> > +            num-lanes = <2>;
> > +            snps,enable-cdm-check;
> > +            max-link-speed = <4>;
> > +        };
> > +    };
> > --
> > 2.25.1
> >
> 
> 
> --
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> 
> 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




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