linux-kernel - Re: [PATCH 3/5] dt-bindings: add more optional properties for elan

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Date:   Wed, 17 Oct 2018 15:15:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        KT Liao <kt.liao@....com.tw>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/5] dt-bindings: add more optional properties for
 elan_i2c touchpads

On Fri, Oct 12, 2018 at 04:24:11PM +0200, Benjamin Tissoires wrote:
> Some new touchpads IC are connected through PS/2 and I2C. On some of these
> new IC, the I2C part doesn't have all of the information available.
> We need to be able to forward the touchpad parameters from PS/2 and
> thus, we need those new optional properties.
> 
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=1628715
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---
>  Documentation/devicetree/bindings/input/elan_i2c.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/elan_i2c.txt b/Documentation/devicetree/bindings/input/elan_i2c.txt
> index 797607460735..ace6bcb0b4eb 100644
> --- a/Documentation/devicetree/bindings/input/elan_i2c.txt
> +++ b/Documentation/devicetree/bindings/input/elan_i2c.txt
> @@ -13,6 +13,14 @@ Optional properties:
>    pinctrl binding [1]).
>  - vcc-supply: a phandle for the regulator supplying 3.3V power.
>  - elan,trackpoint: touchpad can support a trackpoint (boolean)
> +- elan,clickpad: touchpad is a clickpad (the entire surface is a button)

> +- elan,max_x: the maximum reported value on the X axis
> +- elan,max_y: the maximum reported value on the Y axis
> +- elan,min_x: the minimum reported value on the X axis
> +- elan,min_y: the minimum reported value on the Y axis
> +- elan,x_res: the resolution of the X axis (in units per mm)
> +- elan,y_res: the resolution of the Y axis (in units per mm)
> +- elan,width: max reported width of a blob

Can't we use standard touchscreen properties here? (Yes, I get this is a 
touchpad, not touchscreen).

Rob