linux-kernel - Re: [PATCH] arm64: dts: qcom: pmk8350: Make RTC disabled by default; enable on sc7280-idp

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Message-ID: <YVT4dZHRcYlIXK7Q@google.com>
Date:   Wed, 29 Sep 2021 16:36:21 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     bjorn.andersson@...aro.org, vkoul@...nel.org, swboyd@...omium.org,
        skakit@...eaurora.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: pmk8350: Make RTC disabled by default;
 enable on sc7280-idp

On Wed, Sep 29, 2021 at 03:38:14PM -0700, Douglas Anderson wrote:
> The RTC on the pmk8350 is not useful on all boards. Some boards may
> not provide backup power to the PMIC but might have another RTC on the
> board that does have backup power. In this case it's better to not use
> the RTC on the PMIC.
> 
> At the moment, the only boards that includes this PMIC are sc7280-idp
> and sc7280-idp2. On sc7280-idp I'm not aware of any other RTCs, but
> sc7280-idp2 has a Chrome OS EC on it and this is intended to provide
> the RTC for the AP.
> 
> Let's do what we normally do for hardware that's not used by all
> boards and set it to a default status of "disabled" and then enable it
> on the boards that need it.
> 
> NOTE: for sc7280-idp it's _possible_ we might also want to add
> `allow-set-time;`. That could be the subject of a future patch if it
> is indeed true.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>