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arm64: dts: qcom: sc7180: Fix ps8640 power sequence for Homestar rev4

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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@huaqin.corp-partner.google.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211115030155.9395-1-yangcong5@huaqin.corp-partner.google.com
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yangcong 2021-11-15 11:01:55 +08:00 committed by Bjorn Andersson
parent 9ac8999e8d
commit 96e1e3a152
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts
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@ -15,3 +15,7 @@
model = "Google Homestar (rev4+)";
compatible = "google,homestar", "qcom,sc7180";
};
&pp3300_brij_ps8640 {
regulator-enable-ramp-delay = <4000>;
};