linux-kernel - Re: [PATCH v1 05/12] arm64: dts: librem5-devkit: add the sgtl5000 i2c audio codec

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Date:   Mon, 17 Feb 2020 12:05:25 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     robh@...nel.org, mark.rutland@....com, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        Anson.Huang@....com, devicetree@...r.kernel.org, kernel@...i.sm,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: Re: [PATCH v1 05/12] arm64: dts: librem5-devkit: add the sgtl5000
 i2c audio codec

On Wed, Feb 05, 2020 at 03:29:56PM +0100, Martin Kepplinger wrote:
> From: "Angus Ainslie (Purism)" <angus@...ea.ca>
> 
> Describe the sgtl5000 of the librem 5 devkit in devicetree.
> 
> Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
> ---
>  .../boot/dts/freescale/imx8mq-librem5-devkit.dts    | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> index e7e3766198c6..56b4ac286801 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> @@ -480,6 +480,19 @@
>  		vddio-supply = <&reg_3v3_p>;
>  	};
>  
> +	sgtl5000: sgtl5000@a {

audio-codec for the node name.

> +		compatible = "fsl,sgtl5000";
> +		clocks = <&clk IMX8MQ_CLK_SAI2_ROOT>;
> +		assigned-clocks = <&clk IMX8MQ_CLK_SAI2>;
> +		assigned-clock-parents = <&clk IMX8MQ_AUDIO_PLL1_OUT>;
> +		assigned-clock-rates = <24576000>;
> +		#sound-dai-cells = <0>;
> +		reg = <0x0a>;
> +		VDDD-supply = <&reg_1v8_p>;
> +		VDDIO-supply = <&reg_3v3_p>;
> +		VDDA-supply = <&reg_3v3_p>;
> +	};
> +

Add a device only when there is a user for it.

Shawn

>  	touchscreen@5d {
>  		compatible = "goodix,gt5688";
>  		reg = <0x5d>;
> -- 
> 2.20.1
>