linux-kernel - Re: [PATCH v2 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan eKTH8D18

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Message-ID: <174542314188.576994.12974029497689302557.robh@kernel.org>
Date: Wed, 23 Apr 2025 10:45:42 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: linux-mediatek@...ts.infradead.org, linux-input@...r.kernel.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	Benson Leung <bleung@...omium.org>, chrome-platform@...ts.linux.dev,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan
 eKTH8D18


On Mon, 21 Apr 2025 18:12:39 +0800, Chen-Yu Tsai wrote:
> The Elan eKTH8D18 touchscreen controller is an I2C HID device with a
> longer boot-up time. Power sequence timing wise it is compatible with
> the eKTH6A12NAY, with a power-on delay of at least 5ms, 20ms
> out-of-reset for I2C ack response, and 150ms out-of-reset for I2C HID
> enumeration, both shorter than what the eKTH6A12NAY requires.
> Enumeration and subsequent operation follows the I2C HID standard.
> 
> Add a compatible string for it with the ekth6a12nay one as a fallback.
> No enum was used as it is rare to actually add new entries. These
> chips are commonly completely backward compatible, and unless the
> power sequencing delays change, there is no real effort being made to
> keep track of new parts, which come out constantly.
> 
> Also drop the constraints on the I2C address since it's not really
> part of the binding.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
> Changes since v1:
> - Reworded commit message
> - Dropped the enum for the new compatible string entry
> - Dropped constraint on I2C address completely
> ---
>  .../devicetree/bindings/input/elan,ekth6915.yaml     | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>