linux-kernel - Re: [PATCH v5] arm64: dts: qcom: Add support for Xiaomi Poco F1 (Beryllium)

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Message-ID: <CAMi1Hd0=FXSPk+UXte4Etq5p0Ths9rkt9Uuup1OOLD6qzT=XQA@mail.gmail.com>
Date:   Tue, 25 Aug 2020 19:01:01 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Konrad Dybcio <konradybcio@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] arm64: dts: qcom: Add support for Xiaomi Poco F1 (Beryllium)

Hi Konrad,

On Sat, 22 Aug 2020 at 02:51, Konrad Dybcio <konradybcio@...il.com> wrote:
>
> Hi
>
> First of all, sorry if anybody sees this twice. I've been messing with Thunderbird lately.
>
>
>
> > dtb-$(CONFIG_ARCH_QCOM)       += sdm845-cheza-r3.dtb
> > dtb-$(CONFIG_ARCH_QCOM)       += sdm845-db845c.dtb
> > +dtb-$(CONFIG_ARCH_QCOM)      += sdm845-beryllium.dtb
>
> [B]eryllium should come before [C]heza, no? Also, aren't the non-development boards supposed to include the vendor name? i.e. sdm845-(xiaomi/poco)-beryllium.dtb

Ack. I didn't pay attention to that part. I'll fix that.

>
>
> > +     model = "Xiaomi Technologies Inc. Beryllium";
>
> At least with Xperias, we settled on setting the model property to the "pretty" name, in this case Poco F1

Ack.

>
>
> > +     pm8998-rpmh-regulators {
> > +             compatible = "qcom,pm8998-rpmh-regulators";
> > +             qcom,pmic-id = "a";
> > +
> > +             vreg_l1a_0p875: ldo1 {
>
> I think you forgot to include (regulatorname)-supply properties which should cause havoc with all things regulators..

I didn't know that. Thanks for pointing that out. I just copied db845c
dts and started removing the nodes/properties which I didn't seem fit.
There is a very good probability that I goofed up big time.

FWIW in my limited testing so far (Booted AOSP to UI, with working
Touchscreen/BT/WiFi/Audio with out-of-tree drivers [1]), I didn't run
into issues with mainline (v5.9-rc1) or Android GKI (v5.4.58). May be
I just got lucky. I'll check up on the usage of (regulatorname)-supply
properties.

>
>
> > +             vreg_l1a_0p875: ldo1 {
> > +                     regulator-min-microvolt = <880000>;
> > +                     regulator-max-microvolt = <880000>;
> 0p88? Unless it's a PMIC limitation.. Please also confirm names for the rest of the regulators.
>
> Also why are there so few regulators? And none from pmi8998? Are the rest WIP/coming in a followup commit, or are they disabled on this board? AFAICS you only include SoC/PMIC DTs which would suggest they should be there.

I intend to add more regulators and feature nodes in follow up commits.

>
>
> > +/* Reserved memory changes from downstream */
>
> Wouldn't it look better if you included that in the main {} node instead of reopening it in the middle of the file? I mean, it works, but let's hear what others have to say.

Ack. I'll fix that if necessary.

>
>
> > +                      * It seems that mmc_test reports errors if drive
> > +                      * strength is not 16 on clk, cmd, and data pins.
>
> You say that, but then you set "drive-strength = <10>;" for cmd and data, please confirm it's intentional.

In sync with db845c as well as downstream dts but I'll check on this as well.

>
>
> > +&ufs_mem_hc {
>
> UFS comes before USB alphabetically.

Ack. I'll add them alphabetically if that is the common norm.

Regards,
Amit Pundir
[1] https://github.com/pundiramit/linux/commits/beryllium-mainline


>
>
> > +&ufs_mem_phy
>
> Ditto
>
>
> > +&qup_uart6_default
>
> Ditto
>
>
> Konrad