linux-kernel - Re: [PATCH v1] dt-bindings: dsp: mediatek: add mt8186 dsp document

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Date:   Thu, 2 Jun 2022 14:44:31 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v1] dt-bindings: dsp: mediatek: add mt8186 dsp document

Hi Krzysztof,

Thanks for your review and sorry for late response.

On Fri, 2022-04-22 at 17:49 +0200, Krzysztof Kozlowski wrote:
> On 22/04/2022 09:15, Tinghan Shen wrote:
> > This patch adds mt8186 dsp document. The dsp is used for Sound Open
> > Firmware driver node. It includes registers, clocks, memory regions,
> > and mailbox for dsp.
> > 
> > Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> > ---
> > 
> > This patch depends on MT8186 clock bindings.
> > 
https://urldefense.com/v3/__https://lore.kernel.org/all/20220409132251.31725-2-chun-jie.chen@mediatek.com/__;!!CTRNKA9wMg0ARbw!xNJkwM9Z-raJLjgIoriOnjolphzSHqpnATbd3XC7wU7iaUns8gqGB2omSOkliuoDf3g$
> >  
> > 
> > ---
> >  .../bindings/dsp/mediatek,mt8186-dsp.yaml     | 93 +++++++++++++++++++
> >  1 file changed, 93 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/dsp/mediatek,mt8186-dsp.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/dsp/mediatek,mt8186-dsp.yaml
> > b/Documentation/devicetree/bindings/dsp/mediatek,mt8186-dsp.yaml
> > new file mode 100644
> > index 000000000000..00a79e880895
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dsp/mediatek,mt8186-dsp.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: 
> > https://urldefense.com/v3/__http://devicetree.org/schemas/dsp/mediatek,mt8186-dsp.yaml*__;Iw!!CTRNKA9wMg0ARbw!xNJkwM9Z-raJLjgIoriOnjolphzSHqpnATbd3XC7wU7iaUns8gqGB2omSOklA_t3nMM$
> >  
> > +$schema: 
> > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!xNJkwM9Z-raJLjgIoriOnjolphzSHqpnATbd3XC7wU7iaUns8gqGB2omSOkl3OXmT2U$
> >  
> > +
> > +title: Mediatek mt8186 DSP core
> > +

(...snip...)

> > +
> > +  clock-names:
> > +    items:
> > +      - const: audiodsp_sel
> > +      - const: adsp_bus_sel
> 
> What does the "sel" stands for? Maybe just skip the "_sel" suffixes?

No problem. I'll remove '_sel' in next version.

> 
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  mboxes:
> > +    items:
> > +      - description: ipc reply between host and audio DSP.
> > +      - description: ipc request between host and audio DSP.
> > +
> > +  mbox-names:
> > +    items:
> > +      - const: mbox0
> > +      - const: mbox1
> 
> These should be rather some meaningful names, e.g. "rx" and "tx".

The mbox name has to align with the adsp ipc driver.
The adsp ipc driver is using 'mbox%d' for mailbox channels.


https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=9db69df4bdd37eb1f65b6931ee067fb15b9a4d5c

	chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);

	/* ...snip... */

	adsp_chan->ch = mbox_request_channel_byname(cl, chan_name);

Is it ok to continue using these names?
> 
> > +
> > +  memory-region:
> > +    items:
> > +      - description: dma buffer between host and DSP.
> > +      - description: DSP system memory.
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - reg-names
> > +  - clocks
> > +  - clock-names
> > +  - power-domains
> > +  - mbox-names
> > +  - mboxes
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> 
> You do not use these headers.

Ok. I'll remove them at next version.

Thanks,
TingHan

> 
> > +    #include <dt-bindings/clock/mt8186-clk.h>
> > +    dsp@...80000 {
> 
> 
> 
> Best regards,
> Krzysztof