linux-kernel - Re: [PATCH 3/5] arm64: dts: renesas: Add I2C to R8A779A0

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Message-ID: <CAMuHMdW7dO4W9Kohs7vL2qWFxmWMUcNGt679Z5nkJ1yhtgJrgA@mail.gmail.com>
Date:   Tue, 5 Jan 2021 11:49:28 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] arm64: dts: renesas: Add I2C to R8A779A0

Hi Wolfram,

On Wed, Dec 23, 2020 at 6:25 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> From: Koji Matsuoka <koji.matsuoka.xm@...esas.com>
>
> Add I2C devicetree description to V3U
>
> Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@...esas.com>
> [wsa: rebased and double checked]
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/arch/arm64/boot/dts/renesas/r8a779a0.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a779a0.dtsi
> @@ -14,6 +14,16 @@ / {
>         #address-cells = <2>;
>         #size-cells = <2>;
>
> +       aliases {
> +               i2c0 = &i2c0;
> +               i2c1 = &i2c1;
> +               i2c2 = &i2c2;
> +               i2c3 = &i2c3;
> +               i2c4 = &i2c4;
> +               i2c5 = &i2c5;
> +               i2c6 = &i2c6;
> +       };

Do we need the i2c aliases? ;-)

> @@ -115,6 +125,118 @@ sysc: system-controller@...80000 {
>                         #power-domain-cells = <1>;
>                 };
>
> +               i2c0: i2c@...00000 {
> +                       compatible = "renesas,i2c-r8a779a0",
> +                                    "renesas,rcar-gen3-i2c";
> +                       reg = <0 0xe6500000 0 0x40>;
> +                       interrupts = <GIC_SPI 238 IRQ_TYPE_LEVEL_HIGH>;
> +                       clocks = <&cpg CPG_MOD 518>;
> +                       power-domains = <&sysc R8A779A0_PD_ALWAYS_ON>;
> +                       resets = <&cpg 518>;
> +                       dmas = <&dmac1 0x91>, <&dmac1 0x90>;
> +                       dma-names = "tx", "rx";

Might be wise to leave out the DMA properties until we have verified that
DMA works?

> +                       i2c-scl-internal-delay-ns = <110>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       status = "disabled";
> +               };

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