linux-kernel - Re: [PATCH 1/4] arm64: dts: beacon-renesom: Fix gpio expander reference

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Message-ID: <CAHCN7xJ3eyZZm6or0N9WsGV8vsnyOBDWEoVAFyb1iamNe_AF2A@mail.gmail.com>
Date:   Sun, 8 Jan 2023 10:16:33 -0600
From:   Adam Ford <aford173@...il.com>
To:     linux-renesas-soc@...r.kernel.org
Cc:     aford@...conembedded.com,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] arm64: dts: beacon-renesom: Fix gpio expander reference

On Wed, Jan 4, 2023 at 8:12 AM Adam Ford <aford173@...il.com> wrote:
>
> The board used to originally introduce the Beacon Embedded
> RZ/G2[M/N/H] boards had a GPIO expander with address 20, but
> this was change when the final board went to production.
>
> The production boards changed both the part itself and
> the address.  With the incorrect address, the LCD cannot
> come up.  If the LCD fails, the rcar-du driver fails to come up,
> and that also breaks HDMI.
>
> Pre-release board were not shipped to the general public, so it
> should be safe to push this as a fix.  Anyone with a production
> board would have video fail due to this GPIO expander change.
>
Geert,

Is this patch OK as-is? This is more critical to me than the other
patches in the series.

adam

> Fixes: a1d8a344f1ca ("arm64: dts: renesas: Introduce r8a774a1-beacon-rzg2m-kit")
> Signed-off-by: Adam Ford <aford173@...il.com>
>
> diff --git a/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi b/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> index 8166e3c1ff4e..8b6fe235a8f0 100644
> --- a/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> +++ b/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> @@ -437,20 +437,6 @@ wm8962_endpoint: endpoint {
>                 };
>         };
>
> -       /* 0 - lcd_reset */
> -       /* 1 - lcd_pwr */
> -       /* 2 - lcd_select */
> -       /* 3 - backlight-enable */
> -       /* 4 - Touch_shdwn */
> -       /* 5 - LCD_H_pol */
> -       /* 6 - lcd_V_pol */
> -       gpio_exp1: gpio@20 {
> -               compatible = "onnn,pca9654";
> -               reg = <0x20>;
> -               gpio-controller;
> -               #gpio-cells = <2>;
> -       };
> -
>         touchscreen@26 {
>                 compatible = "ilitek,ili2117";
>                 reg = <0x26>;
> @@ -482,6 +468,21 @@ hd3ss3220_out_ep: endpoint {
>                         };
>                 };
>         };
> +
> +       gpio_exp1: gpio@70 {
> +               compatible = "onnn,pca9654";
> +               reg = <0x70>;
> +               gpio-controller;
> +               #gpio-cells = <2>;
> +               gpio-line-names =
> +                       "lcd_reset",
> +                       "lcd_pwr",
> +                       "lcd_select",
> +                       "backlight-enable",
> +                       "Touch_shdwn",
> +                       "LCD_H_pol",
> +                       "lcd_V_pol";
> +       };
>  };
>
>  &lvds0 {
> --
> 2.34.1
>