linux-kernel - Re: [PATCH v7 04/12] dt-bindings: simplified bindings for single-user gpio mux

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Date:   Sun, 8 Jan 2017 10:25:04 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Peter Rosin <peda@...ntia.se>, linux-kernel@...r.kernel.org
Cc:     Wolfram Sang <wsa@...-dreams.de>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jonathan Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v7 04/12] dt-bindings: simplified bindings for single-user
 gpio mux

On 04/01/17 12:16, Peter Rosin wrote:
> Signed-off-by: Peter Rosin <peda@...ntia.se>
Looks neat and tidy to me.

Acked-by: Jonathan Cameron <jic23@...nel.org>
> ---
>  .../devicetree/bindings/mux/mux-controller.txt     | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mux/mux-controller.txt b/Documentation/devicetree/bindings/mux/mux-controller.txt
> index 42b2177e5ae1..4e89df8b2392 100644
> --- a/Documentation/devicetree/bindings/mux/mux-controller.txt
> +++ b/Documentation/devicetree/bindings/mux/mux-controller.txt
> @@ -125,3 +125,29 @@ An example mux controller might look like this:
>  		reg = <0x50>;
>  		#mux-control-cells = <1>;
>  	};
> +
> +
> +Combinded controller and consumer of a GPIO mux
> +-----------------------------------------------
> +
> +For the common case of a single consumer of a GPIO controlled mux, there is
> +a simplified binding which will instantiate an implicit mux controller. Just
> +specify a mux-gpios property with the same interpretation as in mux-gpio.txt.
> +Note that other properties described in mux-gpio.txt are not available in
> +this simplified form and that the mux controller is unnamed. If you need
> +more than one mux controller, a shared mux controller or if you need a
> +specific idle-state, use the more flexible binding with the mux controller
> +in its own node.
> +
> +Example:
> +
> +	adc-mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc 0>;
> +		io-channel-names = "parent";
> +
> +		mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
> +			    <&pioA 1 GPIO_ACTIVE_HIGH>;
> +
> +		channels = "sync-1", "in", "out", "sync-2";
> +	};
>