linux-kernel - Re: [PATCH v2 1/2] dt-bindings: dsp: mediatek: add mt8196 dsp document

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Message-ID: <61784658-c71d-458b-8934-5f5db2330bc0@collabora.com>
Date: Thu, 3 Jul 2025 11:05:52 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 "hailong.fan" <hailong.fan@...iatek.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Liam Girdwood <lgirdwood@...il.com>,
 Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
 Bard Liao <yung-chuan.liao@...ux.intel.com>,
 Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
 Daniel Baluta <daniel.baluta@....com>,
 Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 sound-open-firmware@...a-project.org, linux-sound@...r.kernel.org,
 Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: dsp: mediatek: add mt8196 dsp
 document

Il 03/07/25 10:08, Krzysztof Kozlowski ha scritto:
> On 03/07/2025 09:56, hailong.fan wrote:
>> From: Hailong Fan <hailong.fan@...iatek.com>
>>
>> This patch adds mt8196 dsp document. The dsp is used for Sound Open
> 
> Please do not use "This commit/patch/change", but imperative mood. See
> longer explanation here:
> https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95
> 
>> Firmware driver node. It includes registers,  clocks, memory regions,
>> and mailbox for dsp.
>>
>> Signed-off-by: Hailong Fan <hailong.fan@...iatek.com>
>> ---
>>   .../bindings/sound/mediatek,mt8196-dsp.yaml   | 95 +++++++++++++++++++
>>   1 file changed, 95 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/sound/mediatek,mt8196-dsp.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/sound/mediatek,mt8196-dsp.yaml b/Documentation/devicetree/bindings/sound/mediatek,mt8196-dsp.yaml
>> new file mode 100644
>> index 000000000000..68f594f476e8
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/sound/mediatek,mt8196-dsp.yaml

Wrong folder; this should go to dsp/mediatek,mt8196-dsp.yaml ....

...but then I don't get why MT8196 wasn't simply added to mediatek,mt8186-dsp.yaml.

>> @@ -0,0 +1,95 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/sound/mediatek,mt8196-dsp.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MediaTek mt8196 DSP core
>> +
>> +maintainers:
>> +  - Hailong Fan <hailong.fan@...iatek.com>
>> +
>> +description: The MediaTek mt8196 SoC mt8196 contain a DSP core used for advanced
> 
> Missing blank line. Look at other bindings. Also does not look wrapped
> at 80 (see Linux coding style doc).
> 

There's also a typo, "mt8196 SoC mt8196"

> 
>> +  pre- and post- audio processing.
>> +
>> +properties:
>> +  compatible:
>> +    const: mediatek,mt8196-dsp
>> +
>> +  reg:
>> +    items:
>> +      - description: DSP configuration registers
>> +      - description: DSP SRAM
>> +      - description: DSP secure registers
>> +      - description: DSP bus registers
>> +
>> +  reg-names:
>> +    items:
>> +      - const: cfg
>> +      - const: sram
>> +      - const: sec
>> +      - const: bus
>> +
>> +  clocks:
>> +    items:
>> +      - description: mux for dsp clock
>> +      - description: 26M clock
>> +      - description: ADSP PLL clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: adsp_sel
> 
> Isn't this called audiodsp in other bindings?
> 
>> +      - const: clk26m
> 
> Don't use frequencies. How is the pin or input called in datasheet? How
> other devices call it?

In the datasheet, this is called.... CLK26M (really).

Cheers,
Angelo

> 
>> +      - const: adsppll
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +
> Best regards,
> Krzysztof