linux-kernel - Re: [PATCH] arm64: dts: sc7180: Fix ps8640 power sequence for Homestar rev4

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Message-ID: <CAE-0n531-YnSYJ+Yf8v-s3YE7LkF5i9wuBOTZPmr9DzbCM_Nrg@mail.gmail.com>
Date:   Mon, 15 Nov 2021 15:45:46 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        dianders@...omium.org, philipchen@...omium.org, robh+dt@...nel.org,
        yangcong <yangcong5@...qin.corp-partner.google.com>
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: sc7180: Fix ps8640 power sequence for
 Homestar rev4

Quoting yangcong (2021-11-14 19:01:55)
> When powering up the ps8640, we need to deassert PD right
> after we turn on the vdd33 regulator. Unfortunately, the vdd33
> regulator takes some time (~4ms) to turn on. Add in the delay
> for the vdd33 regulator so that when the driver deasserts PD
> that the regulator has had time to ramp.
>
> Signed-off-by: yangcong <yangcong5@...qin.corp-partner.google.com>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>