linux-kernel - Re: [RFC v2 6/8] MIPS: DTS: jz4780: account for Synopsys HDMI driver and LCD controller

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Message-Id: <1583177253.3.5@crapouillou.net>
Date:   Mon, 02 Mar 2020 16:27:33 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Paul Boddie <paul@...die.org.uk>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-gpio@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com
Subject: Re: [RFC v2 6/8] MIPS: DTS: jz4780: account for Synopsys HDMI driver
 and LCD controller

Hi Nikolaus,


Le ven., févr. 28, 2020 at 19:19, H. Nikolaus Schaller 
<hns@...delico.com> a écrit :
> From: Paul Boddie <paul@...die.org.uk>
> 
> A specialisation of the generic Synopsys HDMI driver is employed for 
> JZ4780
> HDMI support. This requires a new driver, plus device tree and 
> configuration
> modifications.
> 
> Signed-off-by: Paul Boddie <paul@...die.org.uk>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  arch/mips/boot/dts/ingenic/jz4780.dtsi | 32 
> ++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi 
> b/arch/mips/boot/dts/ingenic/jz4780.dtsi
> index f928329b034b..391d4e1efd35 100644
> --- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
> +++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
> @@ -433,4 +433,36 @@
> 
>  		status = "disabled";
>  	};
> +
> +	hdmi: hdmi@...80000 {
> +		compatible = "ingenic,jz4780-dw-hdmi";
> +		reg = <0x10180000 0x8000>;
> +		reg-io-width = <4>;
> +
> +		clocks = <&cgu JZ4780_CLK_HDMI>, <&cgu JZ4780_CLK_AHB0>;
> +		clock-names = "isfr" , "iahb";
> +
> +		assigned-clocks = <&cgu JZ4780_CLK_HDMI>;
> +		assigned-clock-rates = <27000000>;

I *think* this should go to the board file.

> +
> +		interrupt-parent = <&intc>;
> +		interrupts = <3>;
> +
> +		/* ddc-i2c-bus = <&i2c4>; */
> +
> +		status = "disabled";
> +	};
> +
> +	lcd: lcd@...50000 {

The node name should be 'lcd-controller'.

> +		compatible = "ingenic,jz4740-lcd";

The JZ4780's LCD controller is much newer than the JZ4740 one, so even 
if it works with the "ingenic,jz4740-lcd" compatible string, you want 
it as a fallback.
So this should be: compatible = "ingenic,jz4780-lcd", 
"ingenic,jz4740-lcd".

That means the YAML should be updated too.

-Paul

> +		reg = <0x13050000 0x1800>;
> +
> +		clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD0PIXCLK>;
> +		clock-names = "lcd", "lcd_pclk";
> +
> +		interrupt-parent = <&intc>;
> +		interrupts = <31>;
> +
> +		status = "disabled";
> +	};
>  };
> --
> 2.23.0
>