linux-kernel - Re: [PATCH 18/20] arm64: dts: qcom: kaanapali-mtp: Add audio support (WSA8845, WCD9395, DMIC)

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Message-ID: <5ee14d04-c908-445b-a8fc-ec07af267f7f@oss.qualcomm.com>
Date: Mon, 27 Oct 2025 10:39:46 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Prasad Kumpatla <prasad.kumpatla@....qualcomm.com>,
        Jingyi Wang <jingyi.wang@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        aiqun.yu@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        trilok.soni@....qualcomm.com, yijie.yang@....qualcomm.com
Subject: Re: [PATCH 18/20] arm64: dts: qcom: kaanapali-mtp: Add audio support
 (WSA8845, WCD9395, DMIC)

On 10/9/25 1:50 AM, Krzysztof Kozlowski wrote:
> On 08/10/2025 20:30, Konrad Dybcio wrote:
>> On 10/8/25 12:51 PM, Krzysztof Kozlowski wrote:
>>> On 08/10/2025 19:20, Konrad Dybcio wrote:
>>>> On 10/6/25 10:48 AM, Krzysztof Kozlowski wrote:
>>>>> On 30/09/2025 21:06, Prasad Kumpatla wrote:
>>>>>>
>>>>>> On 9/25/2025 6:56 PM, Krzysztof Kozlowski wrote:
>>>>>>> On Thu, 25 Sept 2025 at 09:18, Jingyi Wang <jingyi.wang@....qualcomm.com> wrote:
>>>>>>>> From: Prasad Kumpatla <prasad.kumpatla@....qualcomm.com>
>>>>>>>>
>>>>>>>> Add support for audio on the Kaanapali MTP platform by introducing device
>>>>>>>> tree nodes for WSA8845 smart speaker amplifier for playback, DMIC
>>>>>>>> microphone for capture, and sound card routing. The WCD9395 codec is add
>>>>>>>> to supply MIC-BIAS, for enabling onboard microphone capture.
>>>>>>>>
>>>>>>>> Signed-off-by: Prasad Kumpatla <prasad.kumpatla@....qualcomm.com>
>>>>>>>> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>>>>>>>> ---
>>>>>>>>   arch/arm64/boot/dts/qcom/kaanapali-mtp.dts | 226 +++++++++++++++++++++++++++++
>>>>>>>>   1 file changed, 226 insertions(+)
>>>>>>>>
>>>>>>> Audio is not a separate feature from USB.
>>>>>>
>>>>>> I didn't understand this, Could you please help me to provide more 
>>>>>> context on it?
>>>>>> Is this regarding Audio over Type-c?
>>>>>
>>>>> USB depends on ADSP, so your split of patches into separate audio commit
>>>>> is just incorrect.
>>>>
>>>> No, this is no longer the case on Kaanapali.
>>>>
>>>> PMIC_GLINK is now served by the SoCCP rproc
>>>
>>> Hm, ok.... so there is no WCD93xx USB mux anymore?
>>
>> I see there's a WCD9395 onboard which has that hw block
>>
>> I'll try to find some schematics to confirm..
> 
> I think I was checking this some time ago and design was the same as in
> SM8750 and SM8650, so with WCD9395 USB mux. You could argue that WCD9395
> WCD mux has separate interface than audio part, but it is still the same
> device, thus that is why I think USB and audio are still related.

I found a schematic for the MTP.

The WCD9395 mux is still in place

Konrad