linux-kernel - Re: [PATCH 04/11] arm64: dts: qcom: pm7250b: make SID configurable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <CV6QDWJRJNRH.27JMF9AB7MEXO@otso>
Date:   Thu, 31 Aug 2023 14:32:35 +0200
From:   "Luca Weiss" <luca.weiss@...rphone.com>
To:     "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
        "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>
Cc:     <cros-qcom-dts-watchers@...omium.org>,
        "Andy Gross" <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Conor Dooley" <conor+dt@...nel.org>,
        "Srinivas Kandagatla" <srinivas.kandagatla@...aro.org>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Viresh Kumar" <viresh.kumar@...aro.org>,
        <~postmarketos/upstreaming@...ts.sr.ht>,
        <phone-devel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 04/11] arm64: dts: qcom: pm7250b: make SID configurable

On Thu Aug 31, 2023 at 1:54 PM CEST, Krzysztof Kozlowski wrote:
> On 31/08/2023 13:33, Dmitry Baryshkov wrote:
> > On Thu, 31 Aug 2023 at 13:13, Luca Weiss <luca.weiss@...rphone.com> wrote:
> >>
> >> On Wed Aug 30, 2023 at 12:06 PM CEST, Krzysztof Kozlowski wrote:
> >>> On 30/08/2023 11:58, Luca Weiss wrote:
> >>>> Like other Qualcomm PMICs the PM7250B can be used on different addresses
> >>>> on the SPMI bus. Use similar defines like the PMK8350 to make this
> >>>> possible.
> >>>>
> >>>> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> >>>> ---
> >>>>  arch/arm64/boot/dts/qcom/pm7250b.dtsi | 23 ++++++++++++++++-------
> >>>>  1 file changed, 16 insertions(+), 7 deletions(-)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/qcom/pm7250b.dtsi b/arch/arm64/boot/dts/qcom/pm7250b.dtsi
> >>>> index e8540c36bd99..3514de536baa 100644
> >>>> --- a/arch/arm64/boot/dts/qcom/pm7250b.dtsi
> >>>> +++ b/arch/arm64/boot/dts/qcom/pm7250b.dtsi
> >>>> @@ -7,6 +7,15 @@
> >>>>  #include <dt-bindings/interrupt-controller/irq.h>
> >>>>  #include <dt-bindings/spmi/spmi.h>
> >>>>
> >>>> +/* This PMIC can be configured to be at different SIDs */
> >>>> +#ifndef PM7250B_SID
> >>>> +   #define PM7250B_SID 2
> >>>> +#endif
> >>>
> >>> Why do you send the same patch as v1, without any reference to previous
> >>> discussions?
> >>>
> >>> You got here feedback already.
> >>>
> >>> https://lore.kernel.org/linux-arm-msm/f52524da-719b-790f-ad2c-0c3f313d9fe9@linaro.org/
> >>
> >> Hi Krzysztof,
> >>
> >> I did mention that original patch in the cover letter of this series.
> >> I'm definitely aware of the discussion earlier this year there but also
> >> tried to get an update lately if there's any update with no response.
> > 
> > I think the overall consensus was that my proposal is too complicated
> > for the DT files.
>
> I proposed to duplicate the entries.

If you mean creating a pm7250b-8.dtsi with pm7250b copy-pasted but the
SID changed from 2 & 3 to 8 & 9, I can do that if that's the way
forward.

If this was done, I'd also say then that pm7250b.dtsi should be renamed
to e.g. pm7250b-2.dtsi since it's currently sitting on SID 2 & 3.

> Do you keep QUP nodes in DTSI and customize per address? No.
>
> I definitely do not agree to these ifndef->define. Maybe using just
> define would work (so drop ifndef->define), because this makes it
> obvious and fail-safe if included in wrong place... except that it is
> still not the define we expect. This is not the coding style present in
> other DTSes.

I really don't mind either way, I'd just like to have some way for now.

>
> The true problem how these SPMI bindings were created. Requiring SID
> address in every child is clearly redundant and I think we do not follow
> such approach anywhere else.

Is this something that could be fixed long term? Especially since
Qualcomm is reconfiguring PMICs on different addresses nowadays maybe
there's more or a push to do this?

Regards
Luca

>
> Best regards,
> Krzysztof