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 ECFEA47DF8E; Wed, 29 Jul 2026 12:30:20 +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=1785328225; cv=none; b=q0K/q9tYjM6JHsmnj7+oLW22spLltdw8ClETN2SEn/UA9x2aQBW5ZfAhhXRjOcGVhDufr05rOV55I87QgS8qkF3ToKf+ZZQclOSFk2+zhKttjVSnEYJ2gfYNHbXMDb8t5s1hd7jpkOixrBGbklPN+mcoOAEOfzLIdga4QSzEofc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785328225; c=relaxed/simple; bh=BKpJdyHIbaNklNi7LP68WaowNm54qQnwAd9muME9aOw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Q6n/bZk7ORIz0h6N0Uu+gQbg+aSVm6AITSEkcO/UV8E0hxWAavu6hGYTnEkd9Azlj6aAsiS6VqGq/Q90c6gED6iU0qoKxo3DxAME6R5q6ZDb7yf5AMw70oqV8FQPtjIdy+6+jVya5/EdGJm99BJwhfij1xe2NoVIEyy/i1OLsbM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IzCm6Mgg; 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="IzCm6Mgg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 091561F000E9; Wed, 29 Jul 2026 12:30:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785328216; bh=c39gpDaipRq8GcdtmLLwaEV5JUvgZWUF8ZljIEE+fjc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IzCm6MggWANh3e4bwrTh1MiJjh2H9arRBbjgLLuDcL/Mq+sg/KFP+nnrHFEuKdiaR /2j8fHjyxeJgiIwOuA7KUWUmaw2WUKSJ877RlSNMYrmFVIo71DlI78QN18RlWBGrUh GgSCMvBAxW/wW+MwdqlW5ahL4+DPo6/L8wX8THSigqrPqwocNzbXCmoHOuYZ+KCSnK ggRa+42Whp1hURmBPlnAbOvREoh5sofdGKxNerHMyYtCxIUxQ8jfQrhKaIngdqkpJ7 wq5R4LCC27cg7nboC9uyfIEn78HwldYC2YeE9Z0nXneCSnZsvuC+KKEAyZmmK2OE4p 99H9i0Y3S+wLw== Message-ID: <3c484a68-5db8-464f-992a-6c7584841a10@kernel.org> Date: Wed, 29 Jul 2026 14:30:07 +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> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGPBBMBCgA5AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJp2mE8AAoJEBuTQ307QWKbeaIP /ihHTkTW4KsN/DQ945JJbyu5tI0J80Wue7QyyLPglyKfhgb5cLLNPpOC8cCIJsc7+W3i2P38 s2c1cOH6CYGE7E9ur3Vfme8NW2S2I/Z8VC7bZnzyS23wT17LrsdS/qCpx4o8U+pt/xdXDKph EGRYrIEmMpUWvyYzyYKGIe25FtaayIIKpq8eZYyFcp2f/sG5IkOW5uZzHPMPdcm87jU7fyuQ rAU2vx9r+ulUfQ/q9Z2roC/ode3l7t2pN7BCBCsUDp6JCrUyZrtT1e7EbA0ZRP3aOBNk2P2E DQOgJGjGdO5Yx2Y9LFtltu6JbsBJHi1syGRX3AtQYOMc4Y1WGoeZJmMlvKj2ZqqXNkcWi2DS IQEWB0uW6CqFsBBIMGDa+6OzdaVO/uAVXWDWml02Men3CILdI1MbVjoh8ECqYUY7OQ+JJvNN vnliuq5WM3Ghd3jg/LZZrxXjdIginRHFQCjIJYLKpLZWm1/iDFedcfzqRNYmTtqscdCNHW41 oT3Z7BmO9xwdjuwBS6nmS6JJwkbf5Ot2QR4pB/DRU7ZwjT1qHe+9r9gF32wXVQatHNGK/VVu sfwOnkdxCWkp/qb2gdQRmZh+SedStWshigH6sNfuHBloF/q+hjMRc8b2m326OZdrbSHwY1Sz vti8Hn7n8NjdHO9LKB7BIdjkA9DA5WsqOuVCzsFNBFVDXDQBEADNkrQYSREUL4D3Gws46JEo Z9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLueMNsWLJBv BaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6eiOMheesVS 5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wAGldWsRxb f3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA6z6lBZn0 WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9YegxWKvX XHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt91pFzBSO IpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gUBLHFTg2h YnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/JoFzZ4B0 p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu4vXVFBYI GmpyNPYzRm0QPwARAQABwsF2BBgBCgAgAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtBYpsFAmna YUkACgkQG5NDfTtBYptX+BAApg32CkxwNucNEi8WfWA8oKkW0y8YDuY6ORMo9FWNGiT/OTy0 vyJrLocrpn86zwfjVp+eCrssPYh8eqJfnWqmYv6ACQtHPYzPZQ3mSo8H97Z01oUxITzCxpXm ZkLgPIqtDPcC2E3dPM/fVxcyowM8XsaMA9wcsaUYrta8toOq2b9tKcjleKMfMrm0gQ9u7wUc QbLkwj6TCLOwucb07GXzLTNF9PZmaDUpKAZjMjmrW+le+SFvQbhamx0rxLWPR0NWntXpbCn+ +ACch03p/JyTBVktxFsFyCt7pTPE1kEaeuXBTe/a2D9iQvRxRW19LvuO2e59/u1wYUiH/orz wbIC2S4dBsPAPihL3ztOU1yE86GPyQtSE0kU+/7snnLt4QGi6PChf3t5gnNjAzjUUovO8rgI c+5yN5heq5loYHgK6OQ9OlHzsPHO9e9MOQcKlFycs1pyijFGzDwdNUm/SchK8iWT2QApTx4A K9bCVaboTA2T77QYkRcRJYSsO1alGX0ome/hMLD1daXlkrNUp1HWa3K4iytLRXjCSIorWiGs n+q3krnpXu3TFkA8qtOFZMdnIiFuiq1yLT8hptsV5xh1TA2nsVvSYiaCr3q4s4BKjS/KrLDb qoxzw8ISjdUp4pA85vb6YLCmb39NgidD+7PmAr65lBNveIFynTgsja1rRQ4= In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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. Best regards, Krzysztof