From: Krzysztof Kozlowski <krzk@kernel.org>
To: Johan Hovold <johan+linaro@kernel.org>,
Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Bjorn Andersson <andersson@kernel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Douglas Anderson <dianders@chromium.org>,
linux-input@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/7] dt-bindings: HID: i2c-hid: elan: add 'no-reset-on-power-off' property
Date: Wed, 8 May 2024 09:29:20 +0200 [thread overview]
Message-ID: <a4479812-63aa-4f10-a4a0-0f0a44acb468@kernel.org> (raw)
In-Reply-To: <20240507144821.12275-4-johan+linaro@kernel.org>
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@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Best regards,
Krzysztof
next prev parent reply other threads:[~2024-05-08 7:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 14:48 [PATCH v2 0/7] HID/arm64: dts: qcom: sc8280xp-x13s: fix touchscreen power on Johan Hovold
2024-05-07 14:48 ` [PATCH v2 1/7] dt-bindings: HID: i2c-hid: add dedicated Ilitek ILI2901 schema Johan Hovold
2024-05-07 14:48 ` [PATCH v2 2/7] dt-bindings: HID: i2c-hid: elan: add Elan eKTH5015M Johan Hovold
2024-05-07 14:48 ` [PATCH v2 3/7] dt-bindings: HID: i2c-hid: elan: add 'no-reset-on-power-off' property Johan Hovold
2024-05-08 7:29 ` Krzysztof Kozlowski [this message]
2024-05-07 14:48 ` [PATCH v2 4/7] HID: i2c-hid: elan: fix reset suspend current leakage Johan Hovold
2024-05-10 23:36 ` Doug Anderson
2024-05-20 11:44 ` Johan Hovold
2024-05-20 11:52 ` Johan Hovold
2024-05-20 15:38 ` Doug Anderson
2024-05-07 14:48 ` [PATCH v2 5/7] arm64: dts: qcom: sc8280xp-x13s: fix touchscreen power on Johan Hovold
2024-05-07 14:48 ` [PATCH v2 6/7] arm64: dts: qcom: sc8280xp-crd: use external pull up for touch reset Johan Hovold
2024-05-07 14:48 ` [PATCH v2 7/7] arm64: defconfig: enable Elan i2c-hid driver Johan Hovold
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