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Date:   Tue, 12 Apr 2022 16:43:57 -0700
From:   Matthias Kaehlcke <mka@chromium.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Cc:     agross@kernel.org, bjorn.andersson@linaro.org, robh+dt@kernel.org,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, quic_rohkumar@quicinc.com,
        srinivas.kandagatla@linaro.org, dianders@chromium.org,
        swboyd@chromium.org, judyhsiao@chromium.org,
        Venkata Prasad Potturu <quic_potturu@quicinc.com>
Subject: Re: [PATCH v7 2/2] arm64: dts: qcom: sc7280: add lpass lpi pin
 controller node
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References: <1649685184-8448-1-git-send-email-quic_srivasam@quicinc.com>
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 <9bacee6d-ab44-2975-c523-38164d016af5@quicinc.com>
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On Tue, Apr 12, 2022 at 06:18:33PM +0530, Srinivasa Rao Mandadapu wrote:
> 
> On 4/12/2022 1:02 AM, Matthias Kaehlcke wrote:
> Thanks for your time Matthias!!!
> > On Mon, Apr 11, 2022 at 07:23:04PM +0530, Srinivasa Rao Mandadapu wrote:
> > > Add LPASS LPI pinctrl node required for Audio functionality on sc7280
> > > based platforms.
> > > 
> > > Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
> > > Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
> > > Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/sc7280-idp.dtsi |  84 ++++++++++++++++++++++++
> > >   arch/arm64/boot/dts/qcom/sc7280.dtsi     | 107 +++++++++++++++++++++++++++++++
> > >   2 files changed, 191 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> > > index 4ba2274..ea751dc 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> > > @@ -238,6 +238,90 @@
> > >   	modem-init;
> > >   };
> > > +&dmic01 {
> > Shouldn't these nodes be in the PINCTRL section at their respective
> > positions in alphabetical order?
> 
> These are not part of tlmm pin control section. These are part of lpass_tlmm
> section.

Agreed, these shouldn't be in the tlmm section, but it still seems nice to
separate them from device nodes.

Some sc7180-trogdor devices have a section like this:

/* PINCTRL - modifications to sc7180-trogdor.dtsi */

In any case I don't care too much about the IDP, but this might come up again
for sc7280-herobrine boards.

> In your previous comment you asked to remove &lpass_tlmm. Hence brought out.
> 
> > 
> > nit: since you are keeping the groups the group names are a bit generic IMO.
> > e.g. it is fairly obvious that 'dmic01_clk' refers to a clock pin, however
> > just 'dmic01' is a bit vague. You could consider adding the prefix 'lpass_'
> > to the group names for more clarity.
> as dmic01 has both clk and data section, I don't think keeping clk is
> appropriate here.

Agreed, _clk isn't appropriate as long as it's a group of pins, that would be
for a label per pin.

> >  From the schematics I interpret that the LPASS GPIOs 0-9 are mapped to the
> > SC7280 GPIOs 144-153. Is that correct?
> Yes. But we refer with GPIOs 0-9 in driver.

Thanks, just wanted to make sure my understanding is correct.