linux-kernel - Re: [PATCH] arm64: dts: imx8mp: Add dsp node

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Date:   Fri, 16 Jul 2021 15:47:57 +0300
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Peng Fan <peng.fan@....com>
Cc:     "Daniel Baluta (OSS)" <daniel.baluta@....nxp.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Jacky Bai <ping.bai@....com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Alice Guo <alice.guo@....com>, Robin Gong <yibin.gong@....com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Daniel Baluta <daniel.baluta@....com>
Subject: Re: [PATCH] arm64: dts: imx8mp: Add dsp node

On Fri, Jul 16, 2021 at 5:05 AM Peng Fan <peng.fan@....com> wrote:
>
> Hi Daniel
>
> > Subject: [PATCH] arm64: dts: imx8mp: Add dsp node
> >
> > From: Daniel Baluta <daniel.baluta@....com>
> >
> > i.MX8 MPlus SoC integrates Cadence HIFI4 DSP. This core runs either a custom
> > firmware or the open source SOF firmware [1]
> >
> > DSP device is handled by SOF OF driver found in sound/soc/sof/sof-of-dev.c
> >
> > Notice that the DSP node makes use of:
> >       - dsp_reserved, a reserved memory region for various Audio
> >         resources (e.g firmware loading, audio buffers, etc).
> >       - Messaging Unit (mu2) for passing notifications betweem ARM
> >         core and DSP.
> >
> > [1] https://thesofproject.github.io/latest/platforms/index.html
> > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 28
> > +++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > index 9f7c7f587d38..264ba540f363 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > @@ -135,6 +135,17 @@ clk_ext4: clock-ext4 {
> >               clock-output-names = "clk_ext4";
> >       };
> >
> > +     reserved-memory {
> > +             #address-cells = <2>;
> > +             #size-cells = <2>;
> > +             ranges;
> > +
> > +             dsp_reserved: dsp@...00000 {
> > +                     reg = <0 0x92400000 0 0x2000000>;
> > +                     no-map;
> > +             };
> > +     };
> > +
> >       pmu {
> >               compatible = "arm,cortex-a53-pmu";
> >               interrupts = <GIC_PPI 7
> > @@ -698,6 +709,13 @@ mu: mailbox@...a0000 {
> >                               #mbox-cells = <2>;
> >                       };
> >
> > +                     mu2: mailbox@...60000 {
> > +                             compatible = "fsl,imx8mp-mu", "fsl,imx6sx-mu";
> > +                             reg = <0x30e60000 0x10000>;
> > +                             interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
> > +                             #mbox-cells = <2>;
>
> I think better mark this node as disabled. If its clock not enabled,
> kernel may hang.

Good point. Fixed in v2.