linux-kernel - Re: [PATCH v2 1/4] dt-bindings: w1: document sub-node bindings for DS2760

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Message-ID: <20180703231650.GA9201@rob-hp-laptop>
Date:   Tue, 3 Jul 2018 17:16:50 -0600
From:   Rob Herring <robh@...nel.org>
To:     Daniel Mack <daniel@...que.org>
Cc:     zbr@...emap.net, mark.rutland@....com, szabolcs.gyurko@....hu,
        sre@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        robert.jarzmik@...e.fr
Subject: Re: [PATCH v2 1/4] dt-bindings: w1: document sub-node bindings for
 DS2760

On Thu, Jun 28, 2018 at 09:55:37AM +0200, Daniel Mack wrote:
> This patch add a generic w1 bindings document that merely describes how
> slave deviceses are grouped under master nodes. It also adds a specific
> binding for the ds2760 battery monitor.
> 
> Signed-off-by: Daniel Mack <daniel@...que.org>
> ---
>  .../devicetree/bindings/w1/maxim,ds2760.txt    | 15 +++++++++++++++
>  .../devicetree/bindings/w1/w1-gpio.txt         |  6 ++++++
>  Documentation/devicetree/bindings/w1/w1.txt    | 18 ++++++++++++++++++
>  3 files changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/w1/maxim,ds2760.txt
>  create mode 100644 Documentation/devicetree/bindings/w1/w1.txt
> 
> diff --git a/Documentation/devicetree/bindings/w1/maxim,ds2760.txt b/Documentation/devicetree/bindings/w1/maxim,ds2760.txt
> new file mode 100644
> index 000000000000..d916fdd213f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/w1/maxim,ds2760.txt
> @@ -0,0 +1,15 @@
> +Devicetree bindings for Maxim DS2760
> +====================================
> +
> +The ds2760 is a w1 slave device and must hence have its sub-node in DT
> +under a w1 bus master node.
> +
> +The device exposes a power supply, so the details described in
> +Documentation/devicetree/bindings/power/supply/power_supply.txt apply.
> +
> +Required properties:
> +- compatible: must be "maxim,ds2760"
> +
> +Optional properties:
> +- power-supplies:	Refers to one or more power supplies connected to
> +			this battery.
> diff --git a/Documentation/devicetree/bindings/w1/w1-gpio.txt b/Documentation/devicetree/bindings/w1/w1-gpio.txt
> index 6e09c35d9f1a..6694317bcbed 100644
> --- a/Documentation/devicetree/bindings/w1/w1-gpio.txt
> +++ b/Documentation/devicetree/bindings/w1/w1-gpio.txt
> @@ -13,10 +13,16 @@ Optional properties:
>   - linux,open-drain: if specified, the data pin is considered in
>  		     open-drain mode.
>  
> +Also refer to the generic w1.txt document.
> +
>  Examples:
>  
>  	onewire@0 {
>  		compatible = "w1-gpio";
>  		gpios = <&gpio 126 0>, <&gpio 105 0>;
> +
> +		battery {
> +			compatible = "maxim,ds2760";

Perhaps show the power-supplies property as that's the whole point to 
have in DT.

> +		};
>  	};
>  
> diff --git a/Documentation/devicetree/bindings/w1/w1.txt b/Documentation/devicetree/bindings/w1/w1.txt
> new file mode 100644
> index 000000000000..6ac103f972a0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/w1/w1.txt
> @@ -0,0 +1,18 @@
> +Generic devicetree bindings for onewire (w1) busses
> +===================================================
> +
> +Onewire busses are described through nodes of their master bus controller.
> +Slave devices are listed as sub-nodes of such master devices. For now, one
> +one slave is allowed per bus master.

s/one one/only one/

> +
> +
> +Example:
> +
> +	onewire {
> +		compatible = "w1-gpio";
> +		gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
> +
> +		battery {
> +			compatible = "maxim,ds2760";
> +		};
> +	};
> -- 
> 2.17.1
>