linux-kernel - Re: [PATCH v2 3/7] dt-bindings: HID: i2c-hid: elan: add 'no-reset-on-power-off' property

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Message-ID: <a4479812-63aa-4f10-a4a0-0f0a44acb468@kernel.org>
Date: Wed, 8 May 2024 09:29:20 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Johan Hovold <johan+linaro@...nel.org>, Jiri Kosina <jikos@...nel.org>,
 Benjamin Tissoires <benjamin.tissoires@...hat.com>,
 Bjorn Andersson <andersson@...nel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Konrad Dybcio
 <konrad.dybcio@...aro.org>, Linus Walleij <linus.walleij@...aro.org>,
 Douglas Anderson <dianders@...omium.org>, linux-input@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] dt-bindings: HID: i2c-hid: elan: add
 'no-reset-on-power-off' property

On 07/05/2024 16:48, Johan Hovold wrote:
> When the power supply is shared with other peripherals the reset line
> can be wired in such a way that it can remain deasserted regardless of
> whether the supply is on or not.
> 
> This is important as it can be used to avoid holding the controller in
> reset for extended periods of time when it remains powered, something
> which can lead to increased power consumption. Leaving reset deasserted
> also avoids leaking current through the reset circuitry pull-up
> resistors.
> 
> Add a new 'no-reset-on-power-off' devicetree property which can be used
> by the OS to determine when reset needs to be asserted on power down.
> 
> Note that this property can also be used when the supply cannot be
> turned off by the OS at all.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof