linux-kernel - Re: [PATCH V2 2/6] dt-bindings: remoteproc: imx

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Date:   Mon, 14 Mar 2022 17:38:48 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Peng Fan <peng.fan@....com>
Cc:     Rob Herring <robh@...nel.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "krzysztof.kozlowski@...onical.com" 
        <krzysztof.kozlowski@...onical.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "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>
Subject: Re: [PATCH V2 2/6] dt-bindings: remoteproc: imx_rproc: support
 i.MX8QM

On Thu 10 Mar 19:58 CST 2022, Peng Fan wrote:

> > Subject: Re: [PATCH V2 2/6] dt-bindings: remoteproc: imx_rproc: support
> > i.MX8QM
> > 
> > On Wed, Mar 09, 2022 at 06:21:14PM +0800, Peng Fan (OSS) wrote:
> > > From: Peng Fan <peng.fan@....com>
> > >
> > > Add i.MX8QM compatible
> > >
> > > There are two general purpose M4, so add reg property to indicate the
> > > id.
> > 
> > Where does the id come from? Is this just an index?
> 
> It is software use to identify which is m4_0 and which is m4_1,
> just an index.
> 

"reg" is supposed to represent some sort of identifier on the parent
bus, as such it doesn't seem to be the appropriate property to provide
an arbitrary 0 or 1 to identify which of the two m4s this is.

Regards,
Bjorn

> Thanks,
> Peng.
> 
> > 
> > >
> > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > ---
> > >  .../devicetree/bindings/remoteproc/fsl,imx-rproc.yaml         | 4
> > ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git
> > > a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> > > b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> > > index f25c203dd2f9..41d366cff3cd 100644
> > > --- a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> > > +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> > > @@ -20,6 +20,7 @@ properties:
> > >        - fsl,imx8mn-cm7
> > >        - fsl,imx8mp-cm7
> > >        - fsl,imx8qxp-cm4
> > > +      - fsl,imx8qm-cm4
> > >        - fsl,imx8ulp-cm33
> > >        - fsl,imx7d-cm4
> > >        - fsl,imx7ulp-cm4
> > > @@ -68,6 +69,9 @@ properties:
> > >    power-domains:
> > >      maxItems: 8
> > >
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > >    rsrc-id:
> > >      description:
> > >        This property is to specify the resource id of the remote
> > > processor in SoC
> > > --
> > > 2.30.0
> > >
> > >