linux-kernel - Re: [PATCH 09/13] ARM: dts: qcom: add smem node for ipq8064

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Date:   Wed, 6 Jul 2022 15:01:50 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan McDowell <noodles@...th.li>
Subject: Re: [PATCH 09/13] ARM: dts: qcom: add smem node for ipq8064

On Wed, 6 Jul 2022 at 13:31, Christian Marangi <ansuelsmth@...il.com> wrote:
>
> On Wed, Jul 06, 2022 at 10:39:16AM +0200, Krzysztof Kozlowski wrote:
> > On 05/07/2022 15:39, Christian Marangi wrote:
> > > Add missing smem node for ipq8064.
> > >
> > > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > > Tested-by: Jonathan McDowell <noodles@...th.li>
> > > ---
> > >  arch/arm/boot/dts/qcom-ipq8064.dtsi | 18 ++++++++++++++++++
> > >  1 file changed, 18 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/qcom-ipq8064.dtsi b/arch/arm/boot/dts/qcom-ipq8064.dtsi
> > > index b5aede3d7ccf..98527a7d885e 100644
> > > --- a/arch/arm/boot/dts/qcom-ipq8064.dtsi
> > > +++ b/arch/arm/boot/dts/qcom-ipq8064.dtsi
> > > @@ -908,6 +908,11 @@ lcc: clock-controller@...00000 {
> > >                     #reset-cells = <1>;
> > >             };
> > >
> > > +           sfpb_mutex_block: syscon@...0600 {
> > > +                   compatible = "syscon";
> >
> > syscon alone is not allowed.
> >
>
> Mh... This is problematic. How this should be handled?
> This should be put in sfpb_mutex and change the driver to use regs if
> present instead of syscon?

If nothing else works, you can add two compat strings, for example:
"qcom,ipq8064-sfpb-mutex", "syscon";
This way if we add an sfpb driver at some point, we can still use old dts files.

-- 
With best wishes
Dmitry