linux-kernel - Re: [PATCH v2 2/8] dt-bindings: dsp: fsl,dsp: Add resets property

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Message-ID: <2359786.ElGaqSPkdT@steina-w>
Date: Thu, 20 Feb 2025 15:56:13 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Daniel Baluta <daniel.baluta@...il.com>
Cc: p.zabel@...gutronix.de, robh@...nel.org, shawnguo@...nel.org,
 linux-arm-kernel@...ts.infradead.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
 festevam@...il.com, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, mathieu.poirier@...aro.org, shengjiu.wang@....com,
 Frank.Li@....com, peng.fan@....com, laurentiu.mihalcea@....com,
 iuliana.prodan@....com, Daniel Baluta <daniel.baluta@....com>
Subject: Re: [PATCH v2 2/8] dt-bindings: dsp: fsl,dsp: Add resets property

Hi,

Am Donnerstag, 20. Februar 2025, 14:11:30 CET schrieb Daniel Baluta:
> On Thu, Feb 20, 2025 at 12:37 PM Alexander Stein
> <alexander.stein@...tq-group.com> wrote:
> >
> > Hi,
> >
> > Am Mittwoch, 19. Februar 2025, 20:20:56 CET schrieb Daniel Baluta:
> > > On i.MX8MP we introduced support for using a reset controller
> > > to control DSP operation.
> > >
> > > This patch adds reset property which is required for i.MX8MP.
> > >
> > > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > > ---
> > >  .../devicetree/bindings/dsp/fsl,dsp.yaml      | 19 ++++++++++++++++++-
> > >  1 file changed, 18 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > index ab93ffd3d2e5..923e7f079f1b 100644
> > > --- a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > +++ b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> > > @@ -82,6 +82,13 @@ properties:
> > >      description:
> > >        Phandle to syscon block which provide access for processor enablement
> > >
> > > +  resets:
> > > +    description:
> > > +      A pair consisting of phandle to audio-blk-control and an index referencing
> > > +      the DSP Run/Stall bit in audiomix registers.
> > > +      See include/dt-bindings/reset/imx8mp-reset-audiomix.h for each index meaning.
> > > +    maxItems: 1
> > > +
> > >  required:
> > >    - compatible
> > >    - reg
> > > @@ -164,6 +171,16 @@ allOf:
> > >              - const: txdb1
> > >              - const: rxdb0
> > >              - const: rxdb1
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            enum:
> > > +              - fsl,imx8mp-dsp
> > > +              - fsl,imx8mp-hifi4
> > > +    then:
> > > +      required:
> > > +        - "resets"
> > >
> > >  additionalProperties: false
> > >
> > > @@ -220,5 +237,5 @@ examples:
> > >                 <&mu2 3 0>;
> > >        memory-region = <&dsp_vdev0buffer>, <&dsp_vdev0vring0>,
> > >                        <&dsp_vdev0vring1>, <&dsp_reserved>;
> > > -      fsl,dsp-ctrl = <&audio_blk_ctrl>;
> > > +      resets = <&audio_blk_ctrl IMX8MP_AUDIOMIX_DSP>;
> >
> > Am I missing something here? fsl,dsp-ctrl is used to get the regmap from syscon.
> 
> fsl,dsp-ctrl was used to control the DSP. This functionality for
> imx8mp have been now replaced by
> using the reset controller.
> 
> The example where the diff happens is for imx8mp so for this reason I
> changed it to use the
> new way of doing the rest.

Okay, maybe add another example for 8ulp then.

Best regards,
Alexander
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