linux-kernel - Re: [PATCH v2 2/3] arm64: allwinner: h6: add I2C nodes

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Date:   Fri, 16 Aug 2019 09:50:31 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Bhushan Shah <bshah@....org>
Cc:     Icenowy Zheng <icenowy@...c.io>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, Wolfram Sang <wsa@...-dreams.de>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] arm64: allwinner: h6: add I2C nodes

On Fri, Aug 16, 2019 at 12:17:09PM +0530, Bhushan Shah wrote:
> Add device-tree nodes for i2c0 to i2c2, and also add relevant pinctrl
> nodes.
>
> Suggested-by: Icenowy Zheng <icenowy@...c.io>
> Signed-off-by: Bhushan Shah <bshah@....org>
> ---
> Changes in v2:
>   - Add the SoC specific compatible string instead of re-using a31 one.
>
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 56 +++++++++++++++++++-
>  1 file changed, 55 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> index bcecca17d61d..a1a329926540 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> @@ -329,6 +329,21 @@
>  				function = "hdmi";
>  			};
>
> +			i2c0_pins: i2c0-pins {
> +				pins = "PD25", "PD26";
> +				function = "i2c0";
> +			};
> +
> +			i2c1_pins: i2c1-pins {
> +				pins = "PH5", "PH6";
> +				function = "i2c1";
> +			};
> +
> +			i2c2_pins: i2c2-pins {
> +				pins = "PD23", "PD24";
> +				function = "i2c2";
> +			};
> +
>  			mmc0_pins: mmc0-pins {
>  				pins = "PF0", "PF1", "PF2", "PF3",
>  				       "PF4", "PF5";
> @@ -464,6 +479,45 @@
>  			status = "disabled";
>  		};
>
> +		i2c0: i2c@...2000 {
> +			compatible = "allwinner,sun50i-h6-i2c";

This isn't going to work if you don't patch the driver to add the
compatible. And this isn't what you described in the binding patch.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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