Re: [PATCH] arm64: dts: renesas: r9a07g0{43,44,54}: Drop #address-cells/#size-cells from single child node 'endpoint@0'

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Hi Biju,

Thanks for your patch!

On Sun, Jun 9, 2024 at 11:51 AM Biju Das <biju.das.jz@xxxxxxxxxxxxxx> wrote:
> Fix the below dtcheck_warnings reported by kernel test robot.
>
> dtcheck warnings: (new ones prefixed by >>)

What is dtcheck?

> >> arch/arm64/boot/dts/renesas/r9a07g043u.dtsi:85.11-94.6: Warning
> >> (graph_child_address): /soc/video@10830000/ports/port@1: graph node
> >> has single child node 'endpoint@0', #address-cells/#size-cells are
> >> not necessary
> >> arch/arm64/boot/dts/renesas/r9a07g043u.dtsi:120.11-129.6: Warning
> >> (graph_child_address): /soc/csi2@10830400/ports/port@1: graph node
> >> has single child node 'endpoint@0', #address-cells/#size-cells are
> >> not necessary
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202406081329.snoMrZsJ-lkp@xxxxxxxxx
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> --- a/arch/arm64/boot/dts/renesas/r9a07g043u.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a07g043u.dtsi
> @@ -79,12 +79,8 @@ ports {
>                         #size-cells = <0>;
>
>                         port@1 {
> -                               #address-cells = <1>;
> -                               #size-cells = <0>;
> -
>                                 reg = <1>;
> -                               crucsi2: endpoint@0 {
> -                                       reg = <0>;
> +                               crucsi2: endpoint {

Documentation/devicetree/bindings/media/renesas,rzg2l-cru.yaml
does not document any endpoints under port@1, so I do not know which
one is correct.
Note that the example in the bindings also uses endpoint@0.

>                                         remote-endpoint = <&csi2cru>;
>                                 };
>                         };
> @@ -114,12 +110,8 @@ port@0 {
>                         };
>
>                         port@1 {
> -                               #address-cells = <1>;
> -                               #size-cells = <0>;
>                                 reg = <1>;
> -
> -                               csi2cru: endpoint@0 {
> -                                       reg = <0>;
> +                               csi2cru: endpoint {

Same comment here, instead using
Documentation/devicetree/bindings/media/renesas,rzg2l-csi2.yaml
The example in the bindings also uses endpoint@0.

>                                         remote-endpoint = <&crucsi2>;
>                                 };
>                         };
> diff --git a/arch/arm64/boot/dts/renesas/r9a07g044.dtsi b/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> index 88634ae43287..6a5496dbb05a 100644
> --- a/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> @@ -710,22 +710,14 @@ ports {
>                                 #size-cells = <0>;
>
>                                 port@0 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
> -
>                                         reg = <0>;
> -                                       cruparallel: endpoint@0 {
> -                                               reg = <0>;
> +                                       cruparallel: endpoint {

This part is OK, as
Documentation/devicetree/bindings/media/renesas,rzg2l-cru.yaml
documents that port@0 has a single endpoint without unit address.

>                                         };
>                                 };
>
>                                 port@1 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
> -
>                                         reg = <1>;
> -                                       crucsi2: endpoint@0 {
> -                                               reg = <0>;
> +                                       crucsi2: endpoint {

Again, under port@1, so which one is correct?

>                                                 remote-endpoint = <&csi2cru>;
>                                         };
>                                 };
> @@ -755,12 +747,9 @@ port@0 {
>                                 };
>
>                                 port@1 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
>                                         reg = <1>;
>
> -                                       csi2cru: endpoint@0 {
> -                                               reg = <0>;
> +                                       csi2cru: endpoint {

Likewise.

>                                                 remote-endpoint = <&crucsi2>;
>                                         };
>                                 };
> diff --git a/arch/arm64/boot/dts/renesas/r9a07g054.dtsi b/arch/arm64/boot/dts/renesas/r9a07g054.dtsi
> index e89bfe4085f5..f37034d136b2 100644
> --- a/arch/arm64/boot/dts/renesas/r9a07g054.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a07g054.dtsi
> @@ -715,22 +715,14 @@ ports {
>                                 #size-cells = <0>;
>
>                                 port@0 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
> -
>                                         reg = <0>;
> -                                       cruparallel: endpoint@0 {
> -                                               reg = <0>;
> +                                       cruparallel: endpoint {

OK.

>                                         };
>                                 };
>
>                                 port@1 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
> -
>                                         reg = <1>;
> -                                       crucsi2: endpoint@0 {
> -                                               reg = <0>;
> +                                       crucsi2: endpoint {

port@1, so is this correct?

>                                                 remote-endpoint = <&csi2cru>;
>                                         };
>                                 };
> @@ -760,12 +752,8 @@ port@0 {
>                                 };
>
>                                 port@1 {
> -                                       #address-cells = <1>;
> -                                       #size-cells = <0>;
>                                         reg = <1>;
> -
> -                                       csi2cru: endpoint@0 {
> -                                               reg = <0>;
> +                                       csi2cru: endpoint {

Likewise.

>                                                 remote-endpoint = <&crucsi2>;
>                                         };
>                                 };

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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