linux-kernel - Re: [PATCH V7 5/5] arm64: dts: qcom: sc7280: Add pm8008 support for sc7280-idp

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Message-ID: <CAE-0n50J=4qrkR9ycEGxbKVHwm9Om8S2YSJR_Y71_iErR-wAHw@mail.gmail.com>
Date:   Mon, 28 Feb 2022 12:36:02 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Satya Priya Kakitapalli <quic_c_skakit@...cinc.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Das Srinagesh <gurus@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_collinsd@...cinc.com,
        quic_subbaram@...cinc.com, quic_jprakash@...cinc.com
Subject: Re: [PATCH V7 5/5] arm64: dts: qcom: sc7280: Add pm8008 support for sc7280-idp

Quoting Satya Priya Kakitapalli (Temp) (2022-02-28 06:25:06)
>
> On 2/19/2022 7:31 AM, Stephen Boyd wrote:
> > Quoting Satya Priya (2022-02-18 03:01:03)
>
> >> +               pins = "gpio4";
> >> +               function = "normal";
> >> +               bias-disable;
> >> +               output-high;
> > Is this a reset signal? Should the driver be deasserting the reset when
> > it is ready? That could be the same time the gpio is acquired.
>
>
> I didn't get your question exactly.. hope this answers your query
>
> The pm8008 chip needs this gpio to be toggled , in order to come out of
> reset and start any transactions..
>
> Please let me know if you have more queries

Yes that answers it for me. Thanks.

This is a reset gpio and should be a DT property like

	reset-gpios = <&pm8350c_gpios 4 GPIO_ACTIVE_HIGH>

in the pm8008 node. When the driver probes it should get the gpio and
do any toggling to take it out of reset. It shouldn't be done through
pinconf settings.