linux-kernel - Re: [PATCH 1/2] bindings: sound: pcm3168a: Document optional RST gpio

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Date:   Mon, 18 Nov 2019 15:32:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     broonie@...nel.org, lgirdwood@...il.com,
        alsa-devel@...a-project.org, kuninori.morimoto.gx@...esas.com,
        linus.walleij@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] bindings: sound: pcm3168a: Document optional RST gpio

On Wed, Nov 13, 2019 at 02:47:33PM +0200, Peter Ujfalusi wrote:
> On boards where the RST line is not pulled up, but it is connected to a
> GPIO line this property must present in order to be able to enable the
> codec.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>  Documentation/devicetree/bindings/sound/ti,pcm3168a.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/ti,pcm3168a.txt b/Documentation/devicetree/bindings/sound/ti,pcm3168a.txt
> index 5d9cb84c661d..f30aebc7603a 100644
> --- a/Documentation/devicetree/bindings/sound/ti,pcm3168a.txt
> +++ b/Documentation/devicetree/bindings/sound/ti,pcm3168a.txt
> @@ -25,6 +25,12 @@ Required properties:
>  
>  For required properties on SPI/I2C, consult SPI/I2C device tree documentation
>  
> +Optional properties:
> +
> +  - rst-gpios : Optional RST gpio line for the codec
> +		RST = low: device power-down
> +		RST = high: device is enabled

'reset-gpios' is the standard naming for reset lines.

> +
>  Examples:
>  
>  i2c0: i2c0@0 {
> @@ -34,6 +40,7 @@ i2c0: i2c0@0 {
>  	pcm3168a: audio-codec@44 {
>  		compatible = "ti,pcm3168a";
>  		reg = <0x44>;
> +		rst-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
>  		clocks = <&clk_core CLK_AUDIO>;
>  		clock-names = "scki";
>  		VDD1-supply = <&supply3v3>;
> -- 
> Peter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>