From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1A92481FAF; Wed, 29 Jul 2026 12:43:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785329046; cv=none; b=VNqZzEcKEAMdOH3fF4/SnieIoyQtAhbW4ENeXo3aj3cyx/3Ds8yfPgXxcl7k6+8t6827iSc6db4gtqbMDTG5038bVhEBs88OVWAZNhVSCUmlQdRVyTNLNArCXWwUoY8K3UoXWQRVxsEFqz4It1uV0CwsavWRJCjKaCiy7A8WS/o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785329046; c=relaxed/simple; bh=jSAOvCNLUccg2QkmtsqmycDxn2Wh/ERQhZLs5+IRTLI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Lsu4X8sMwgHtMcOtj3dJ8AFGzuwCsch+6Gahy+RqVGXTxNXtVuMYvrrzo+ocoaLgDu0rWkHQwy+p6Xm2cNS8mRvjJlhs1/bLoq91kH2aCJE0yS87yK+ODzsG2aNEoQIl1+yO86Dl7J/T2sRTDyUEvG7SG3IqoW1ZQ9fYhG5oMk8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IgMryxma; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IgMryxma" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 446841F00A3A; Wed, 29 Jul 2026 12:43:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785329034; bh=zKJ3nLlyFpv9ZABf3+g3F88lSeUX9s1rtPBz/svgPV8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IgMryxmazxYmeZd+jQZmLr0kJfE/AKZirwEdO8SVTDjNal6ofYiGwYKGtoM6E02MW guYbW8LSpYIrv1HmZL1ZPvFzIzBbpwY+Sg5P6nh0MwfpZ9ZJz43oGQWan01N8yABk4 czWjNaiMavFrxMICUq/q6BJRvqUDK8rRluUm7NkYmkFbMbyjeYsoJKGWniCf6RM6tS BlxWFGXnWlnT6KrZN4RZSC7H9bResbSCtNTgFtwxIHQqa5Dch6f7l1lXnaRZXcfet7 jZK7SVkGJz+GSVsnR5U9UssHL3rLutoYHO0Gz2iZPQS6fgDwcwOmG7JJqAIpqLjiQ2 zEmqJPlnMFpxA== Message-ID: Date: Wed, 29 Jul 2026 14:43:43 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 7/8] dt-bindings: sound: qcom: add Tambora WCD9378 SDCA codec To: Srinivas Kandagatla , Mark Brown , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Charles Keepax , Maciej Strozek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Srinivas Kandagatla Cc: Bard Liao , Pierre-Louis Bossart , Richard Fitzgerald , Jorijn van der Graaf , linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, patches@opensource.cirrus.com, linux-kernel@vger.kernel.org References: <20260722234221.884765-1-srinivas.kandagatla@oss.qualcomm.com> <20260722234221.884765-8-srinivas.kandagatla@oss.qualcomm.com> <219d44e2-28ed-4c54-bd00-66e687a0ba48@kernel.org> <3c484a68-5db8-464f-992a-6c7584841a10@kernel.org> <0cb5a2dd-c49e-47e3-8cc5-ab2ffd397a32@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 29/07/2026 14:36, Srinivas Kandagatla wrote: > On 7/29/26 1:30 PM, Krzysztof Kozlowski wrote: >> On 29/07/2026 14:17, Srinivas Kandagatla wrote: >>> On 7/29/26 12:40 PM, Krzysztof Kozlowski wrote: >>>> On 23/07/2026 01:42, Srinivas Kandagatla wrote: >>>>> Describe the WCD9378 SDCA peripheral node (compatible sdw20217011000) >>>>> driven by the wcd9378-sdca codec driver for headphone playback, headset >>>>> mic capture and jack detection via the SimpleJack SDCA function type. >>>>> >>>>> WCD9378 codec can be wired up in 2 different modes. >>>>> "mobile mode" on phone/tablet SoCs is enumerated as tx and rx device, >>>>> each of which has dedicated control and data lines. >>>>> "compute mode" on compute platforms such as Glymur is enumerated as >>>>> single standard MIPI SDCA class device. >>>>> >>>>> Both modes share same Device ID, compatible; qcom,compute-mode selects >>>>> which driver path is taken. Supplies, reset GPIO and mic-bias voltages >>>>> live on the SoundWire slave node in compute mode and are forbidden in >>>>> mobile mode (owned by the top-level codec parent there). >>>>> >>>>> Assisted-by: Claude:claude-opus-4-7 >>>>> Signed-off-by: Srinivas Kandagatla >>>>> --- >>>>> .../bindings/sound/qcom,wcd9378-sdw.yaml | 200 ++++++++++++++++++ >>>>> 1 file changed, 200 insertions(+) >>>>> create mode 100644 Documentation/devicetree/bindings/sound/qcom,wcd9378-sdw.yaml >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/sound/qcom,wcd9378-sdw.yaml b/Documentation/devicetree/bindings/sound/qcom,wcd9378-sdw.yaml >>>>> new file mode 100644 >>>>> index 000000000000..2ed4ad92958e >>>>> --- /dev/null >>>>> +++ b/Documentation/devicetree/bindings/sound/qcom,wcd9378-sdw.yaml >>>>> @@ -0,0 +1,200 @@ >>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>>>> +%YAML 1.2 >>>>> +--- >>>>> +$id: http://devicetree.org/schemas/sound/qcom,wcd9378-sdw.yaml# >>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>>>> + >>>>> +title: Qualcomm SoundWire Slave devices on WCD9378 >>>>> + >>>>> +maintainers: >>>>> + - Jorijn van der Graaf >>>>> + - Srinivas Kandagatla >>>>> + >>>>> +description: | >>>>> + The Qualcomm WCD9378 codec presents its SoundWire slave devices with >>>>> + class ID sdw20217011000 in both operating modes: >>>>> + >>>>> + * mobile mode -- two slave instances sit on separate SoundWire >>>>> + masters carrying data only. A separate top-level codec node >>>>> + owns the codec's supplies, mic-bias voltages and reset GPIO. >>>>> + >>>>> + * SDCA / compute mode -- one aggregated slave sits on a multi-lane >>>>> + master and carries both control and data. There is no separate >>>>> + top-level codec node, so the SoundWire slave node itself owns >>>>> + supplies, reset GPIO and mic-bias voltage configuration. It is >>>>> + marked with qcom,compute-mode. >>>>> + >>>>> + Codec drivers that match sdw20217011000 use qcom,compute-mode to >>>>> + decide which mode to serve; the presence or absence of this property >>>>> + also gates whether the supply and mic-bias properties on this node >>>>> + are required or forbidden. >>>>> + >>>>> +properties: >>>>> + compatible: >>>>> + const: sdw20217011000 >>>>> + >>>>> + reg: >>>>> + maxItems: 1 >>>>> + >>>>> + qcom,compute-mode: >>>>> + description: | >>>>> + Marks this SoundWire slave as the single aggregated slave that >>>>> + implements the codec in SDCA / compute mode. Only present when >>>>> + the codec has no separate top-level codec parent; in that case >>>>> + this slave node also owns the codec's supplies, reset GPIO and >>>>> + mic-bias voltage configuration. Absent in mobile mode. >>>> >>>> I doubt there is really "compute" or "mobile" mode, so you just wrote to >>>> match use case, but that does not match hardware. >>>> >>> This is hardware fuse setting, its not just usecase based but it changes >>> complete wcd9378 hardware topology, in mobile mode we have 2 soundwire >>> devices representing tx and rx side of wcd9378 however in compute mode >>> it only has one soundwire device dealing with both tx and rx. compute >>> mode is sdca class compliant device. >>> >>> >>>> I think there should be no separate top-level codec parent in the first >>>> place, thus this property is not needed. You always list here all resources. >>> There is no top level aggregated device when the codec is fused in >>> compute mode. >> >> There should not be a top-level in either case. This was always Linux >> driver limitation. > > That is not true, its clearly a hardware topology thing. > Codec has two devices tx and rx, Only one of the device (tx) has access > to CSR registers of the codec, so rx and tx are pretty much a single > aggregate codec device which is why we have top-level representation of > the aggregate device. So two devices, but not three. If TX has access to RX, it does not mean there is third device. If there was a third device (that top level thingy) you would have it here as well. You don't have, because it is purely for Linux. Best regards, Krzysztof