linux-kernel - Re: [PATCH 1/2] devicetree: i2c-hid: Add regulator support

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Message-ID: <20161205090813.GL1280@mail.corp.redhat.com>
Date:   Mon, 5 Dec 2016 10:08:13 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Jiri Kosina <jikos@...nel.org>, Caesar Wang <wxt@...k-chips.com>,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH 1/2] devicetree: i2c-hid: Add regulator support

On Dec 02 2016 or thereabouts, Brian Norris wrote:
> From: Caesar Wang <wxt@...k-chips.com>
> 
> Document a "vdd-supply" and an initialization delay. Can be used for
> powering on/off a HID.
> 
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Jiri Kosina <jikos@...nel.org>
> Cc: linux-input@...r.kernel.org
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
> v2:
>  * add compatible property for wacom, per Rob's request
>  * name the regulator property specifically (VDD)
> 
> v3:
>  * remove wacom property, per Benjamin's request
>  * add delay property
> 
> v4: no change
> ---
>  Documentation/devicetree/bindings/input/hid-over-i2c.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.txt b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
> index 488edcb264c4..1ea290167652 100644
> --- a/Documentation/devicetree/bindings/input/hid-over-i2c.txt
> +++ b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
> @@ -17,6 +17,11 @@ Required properties:
>  - interrupt-parent: the phandle for the interrupt controller
>  - interrupts: interrupt line
>  
> +Optional properties:
> +- vdd-supply: phandle of the regulator that provides the supply voltage.
> +- init-delay-ms: time required by the device after power-on before it is ready
> +  for communication.

Nitpick: maybe we should say that the power-on applies to the vdd-supply
parameter, not the SET_POWER HID command. I am just worried people will
misuse this parameter.

Otherwise, Acked-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

> +
>  Example:
>  
>  	i2c-hid-dev@2c {
> -- 
> 2.8.0.rc3.226.g39d4020
>