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

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Message-ID: <37b1c3e3-5a33-4d6c-b053-525bfd0583da@kernel.org>
Date: Thu, 9 Oct 2025 08:50:30 +0900
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 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 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.

Best regards,
Krzysztof