linux-kernel - Re: [RFC PATCH 4/7] dt-bindings: iio: iio-mux: document iio-mux bindings

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Message-ID: <e09b7aa4-8e98-b07c-d0d8-b24d619f9e00@metafoo.de>
Date:   Thu, 17 Nov 2016 12:40:15 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
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>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.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
Subject: Re: [RFC PATCH 4/7] dt-bindings: iio: iio-mux: document iio-mux
 bindings

On 11/17/2016 12:48 AM, Peter Rosin wrote:
> ---
>  .../bindings/iio/multiplexer/iio-mux.txt           | 59 ++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt b/Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt
> new file mode 100644
> index 000000000000..2f5c7fc35a42
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt
> @@ -0,0 +1,59 @@
> +IIO multiplexer bindings
> +
> +If a multiplexer is used to select when hardware signal is fed to
> +e.g. an ADC channel, these bindings describe that situation.
> +
> +Required properties:
> +- compatible : "iio-mux"
> +- io-channels : Channel node of the parent channel that has multiplexed
> +		input.
> +- io-channel-names : Should be "parent".
> +- control-muxes : Node of the multiplexer that controls the input signal.
> +- control-mux-names : Should be "mux".
> +- #address-cells = <1>;
> +- #size-cells = <0>;
> +
> +Required properties for iio-mux child nodes:
> +- reg : The multiplexer number.
> +
> +Optional properties for iio-mux child nodes:
> +- iio-ext-info : Array of string pairs, the first item in each pair is the
> +		 iio ext_info attribute name, and the second item in each
> +		 pair is the iio ext_info value for that attribute. The
> +		 mux will write these ext_info values to the corresponding
> +		 ext_info attributes on every multiplexer switch.

This can't go into the devicetree in its current form as it exposes
implementation details of the Linux kernel drivers.