linux-kernel - Re: [PATCH v2 13/22] arm64: dts: qcom: sc7180: Enable cros-ec-spi as wake source

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Message-ID: <CAD=FV=Vv450bQ+GrUh9Gr1nRcg5K0t-J_eoPpxJ=GmqOQavGYw@mail.gmail.com>
Date: Wed, 20 Dec 2023 16:10:27 -0800
From: Doug Anderson <dianders@...omium.org>
To: Mark Hasemeyer <markhas@...omium.org>
Cc: LKML <linux-kernel@...r.kernel.org>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Tzung-Bi Shih <tzungbi@...nel.org>, 
	Raul Rangel <rrangel@...omium.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Andy Shevchenko <andriy.shevchenko@...el.com>, Rob Herring <robh@...nel.org>, 
	Sudeep Holla <sudeep.holla@....com>, Bjorn Andersson <andersson@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	cros-qcom-dts-watchers@...omium.org, devicetree@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 13/22] arm64: dts: qcom: sc7180: Enable cros-ec-spi as
 wake source

Hi,

On Wed, Dec 20, 2023 at 3:55 PM Mark Hasemeyer <markhas@...omium.org> wrote:
>
> The cros_ec driver currently assumes that cros-ec-spi compatible device
> nodes are a wakeup-source even though the wakeup-source property is not
> defined.
>
> Add the wakeup-source property to all cros-ec-spi compatible device
> nodes to match expected behavior.
>
> Signed-off-by: Mark Hasemeyer <markhas@...omium.org>
> ---
>
> Changes in v2:
> -Split by arch/soc
>
>  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 +
>  1 file changed, 1 insertion(+)

It's hard to get context with just the dts patches, but digging up the
cover letter and other patches from lore I see you point at
`Documentation/devicetree/bindings/power/wakeup-source.txt` which says
that devices that can wakeup should have this property. ...and our EC
can wake us up, so this looks right from that point of view.

Also the yaml file for cros-ec says it's fine to have this property. I
think it was used when things were connected via i2c since the i2c
subsystem needed it. ...so from a bindings perspective it also seems
fine to me.

...and looking at the code in Linux, I guess things work today because
cros_ec_spi_probe() unconditionally calls device_init_wakeup(). ...but
even with the code today I believe it should be fine to add this
property.

So with all that, this patch looks fine to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>