Date:   Fri, 8 Oct 2021 15:19:17 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Ohad Ben Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM" 
        <linux-remoteproc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/4] dt-bindings: dsp: fsl: update binding document for
 remote proc driver

On Fri, Oct 8, 2021 at 12:12 PM Shengjiu Wang <shengjiu.wang@...il.com> wrote:
>
> Hi Rob
>
> On Sat, Oct 2, 2021 at 12:40 AM Rob Herring <robh@...nel.org> wrote:
> >
> > On Wed, Sep 29, 2021 at 9:34 PM Shengjiu Wang <shengjiu.wang@...il.com> wrote:
> > >
> > > Hi Rob
> > >
> > > On Thu, Sep 30, 2021 at 6:40 AM Rob Herring <robh@...nel.org> wrote:
> > > >
> > > > On Sun, Sep 26, 2021 at 11:07:10AM +0800, Shengjiu Wang wrote:
> > > > > As there are two drivers for DSP on i.MX, one is for sound open
> > > > > firmware, another is for remote processor framework. In order to
> > > > > distinguish two kinds of driver, defining different compatible strings.
> > > > >
> > > > > For remote proc driver, the properties firmware-name and fsl,dsp-ctrl
> > > > > are needed and the mailbox channel is different with SOF.
> > > > >
> > > > > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > > > > Acked-by: Daniel Baluta <daniel.baluta@....com>
> > > > > ---
> > > > >  .../devicetree/bindings/dsp/fsl,dsp.yaml      | 81 +++++++++++++++++--
> > > > >  1 file changed, 75 insertions(+), 6 deletions(-)
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > > > index 7afc9f2be13a..51ea657f6d42 100644
> > > > > --- a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > > > +++ b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > > > @@ -8,6 +8,7 @@ title: NXP i.MX8 DSP core
> > > > >
> > > > >  maintainers:
> > > > >    - Daniel Baluta <daniel.baluta@....com>
> > > > > +  - Shengjiu Wang <shengjiu.wang@....com>
> > > > >
> > > > >  description: |
> > > > >    Some boards from i.MX8 family contain a DSP core used for
> > > > > @@ -19,6 +20,10 @@ properties:
> > > > >        - fsl,imx8qxp-dsp
> > > > >        - fsl,imx8qm-dsp
> > > > >        - fsl,imx8mp-dsp
> > > > > +      - fsl,imx8qxp-hifi4
> > > > > +      - fsl,imx8qm-hifi4
> > > > > +      - fsl,imx8mp-hifi4
> > > > > +      - fsl,imx8ulp-hifi4
> > > > >
> > > > >    reg:
> > > > >      maxItems: 1
> > > > > @@ -28,37 +33,63 @@ properties:
> > > > >        - description: ipg clock
> > > > >        - description: ocram clock
> > > > >        - description: core clock
> > > > > +      - description: debug interface clock
> > > > > +      - description: message unit clock
> > > > > +    minItems: 3
> > > > > +    maxItems: 5
> > > >
> > > > Don't need maxItems.
> > >
> > > Ok, I will update it.
> > >
> > > >
> > > > >
> > > > >    clock-names:
> > > > >      items:
> > > > >        - const: ipg
> > > > >        - const: ocram
> > > > >        - const: core
> > > > > +      - const: debug
> > > > > +      - const: mu
> > > > > +    minItems: 3
> > > > > +    maxItems: 5
> > > >
> > > > ditto
> > >
> > > Ok, I will update it.
> > >
> > > >
> > > > >
> > > > >    power-domains:
> > > > >      description:
> > > > >        List of phandle and PM domain specifier as documented in
> > > > >        Documentation/devicetree/bindings/power/power_domain.txt
> > > > > +    minItems: 1
> > > >
> > > > This is curious. The h/w sometimes has fewer power domains?
> > >
> > > On i.MX8QM/8QXP,  there are independent power domains for DSP core,
> > > DSP's RAM and DSP's MU.
> > > But on i.MX8MP, all these DSP components are in same audio subsystem
> > > There is only one power domain for whole audio subsystem,  when
> > > power on audio subsystem, the DSP's components are powered on also.
> > >
> > > So the number of power domain depends on how the DSP component
> > > integrated in SoC.
> >
> > Sounds like you can write an if/then schema for this difference.
> >
>
> I try this:
>
> allOf:
>   - if:
>       properties:
>         compatible:
>           contains:
>             enum:
>               - fsl,imx8mp-hifi4
>               - fsl,imx8mp-dsp
>
>     then:
>       properties:
>         power-domains:
>           maxItems: 1
>
>     else:
>       properties:
>         power-domains:
>           maxItems: 4
>
>
> But the dt_binding_check report error:
>   DTEX    Documentation/devicetree/bindings/dsp/fsl,dsp.example.dts
>   DTC     Documentation/devicetree/bindings/dsp/fsl,dsp.example.dt.yaml
>   CHECK   Documentation/devicetree/bindings/dsp/fsl,dsp.example.dt.yaml
> /opt/alsa/sound/Documentation/devicetree/bindings/dsp/fsl,dsp.example.dt.yaml:
> dsp@...e8000: power-domains: [[4294967295]] is too short
>         From schema:
> /opt/alsa/sound/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
>
> I don't know the reason, could you please help to have a look what
> is wrong?

Seems still need to add "minItems" in original power-domains besides
if/then schema. otherwise the dt_binding_check report above
error.

Best Regards
Wang Shengjiu

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