linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq8074: add SMEM support

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Date:   Mon, 20 Sep 2021 11:25:55 +0200
From:   Robert Marko <robimarko@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     agross@...nel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: ipq8074: add SMEM support

On Mon, 20 Sept 2021 at 04:52, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Thu 02 Sep 16:47 CDT 2021, Robert Marko wrote:
>
> > IPQ8074 uses SMEM like other modern QCA SoC-s, so since its already
> > supported by the kernel add the required DT nodes.
> >
> > Signed-off-by: Robert Marko <robimarko@...il.com>
>
> Thanks for your patch Robert.
>
> > ---
> >  arch/arm64/boot/dts/qcom/ipq8074.dtsi | 28 +++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/ipq8074.dtsi b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> > index a620ac0d0b19..83e9243046aa 100644
> > --- a/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> > @@ -82,6 +82,29 @@ scm {
> >               };
> >       };
> >
> > +     reserved-memory {
> > +             #address-cells = <2>;
> > +             #size-cells = <2>;
> > +             ranges;
> > +
> > +             smem_region: memory@...00000 {
> > +                     no-map;
> > +                     reg = <0x0 0x4ab00000 0x0 0x00100000>;
> > +             };
> > +     };
> > +
> > +     tcsr_mutex: hwlock {
> > +             compatible = "qcom,tcsr-mutex";
> > +             syscon = <&tcsr_mutex_regs 0 0x80>;
>
> Since it's not okay to have a lone "syscon" and I didn't think it was
> worth coming up with a binding for the TCSR mutex "syscon" I rewrote the
> binding a while back. As such qcom,tcsr-mutex should now live in /soc
> directly.
>
> So can you please respin accordingly?

Sure, can you just confirm that the:
reg = <0x01905000 0x8000>;

Is the whole TCSR range as I don't have docs?

Regards,
Robert
>
> Thanks,
> Bjorn
>
> > +             #hwlock-cells = <1>;
> > +     };
> > +
> > +     smem {
> > +             compatible = "qcom,smem";
> > +             memory-region = <&smem_region>;
> > +             hwlocks = <&tcsr_mutex 0>;
> > +     };
> > +
> >       soc: soc {
> >               #address-cells = <0x1>;
> >               #size-cells = <0x1>;
> > @@ -293,6 +316,11 @@ gcc: gcc@...0000 {
> >                       #reset-cells = <0x1>;
> >               };
> >
> > +             tcsr_mutex_regs: syscon@...5000 {
> > +                     compatible = "syscon";
> > +                     reg = <0x01905000 0x8000>;
> > +             };
> > +
> >               sdhc_1: sdhci@...4900 {
> >                       compatible = "qcom,sdhci-msm-v4";
> >                       reg = <0x7824900 0x500>, <0x7824000 0x800>;
> > --
> > 2.31.1
> >