linux-kernel - [PATCH v1 0/3] db845c/rb3: add i2s playback support

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Message-ID: <20241205023344.2232529-1-alexey.klimov@linaro.org>
Date: Thu,  5 Dec 2024 02:33:41 +0000
From: Alexey Klimov <alexey.klimov@...aro.org>
To: broonie@...nel.org,
	konradybcio@...nel.org,
	andersson@...nel.org,
	srinivas.kandagatla@...aro.org
Cc: tiwai@...e.com,
	lgirdwood@...il.com,
	perex@...ex.cz,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dmitry.baryshkov@...aro.org,
	linux-sound@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/3] db845c/rb3: add i2s playback support

There are i2s signals provided in low-speed connector on such boards
as required by 96boards spec. Looks like it is possible to actually
playback something via these pins after adding missing parts here
and there.

I tested simple widely available cheap DACs like UDA1334 and PCM5102A
and they works just fine without need for mclk. I guess any DAC that
can handle 48 kHz and 16bit will do.

In theory db845 can work without mezzanine board and this provides
one more use-case to playback sound and not all mezzanines have cosy
audio connectors.

After staring at
https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210621074152.306362-1-judyhsiao@chromium.org/
I suspect that this might not gonna fly since it requires dummy codec.
Or maybe specific half-dummy qcom codec for such use-case is required to
verify hw parameters. Couldn't say.

Alexey Klimov (3):
  ASoC: qcom: common: set codecless link to be a backend
  ASoC: qcom: sdm845: add handling of secondary MI2S clock
  arm64: dts: qcom: sdm845-db845c: add i2s playback support via LS1
    connector

 arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 43 +++++++++++++++++++++-
 sound/soc/qcom/common.c                    |  4 ++
 sound/soc/qcom/sdm845.c                    |  5 ++-
 3 files changed, 48 insertions(+), 4 deletions(-)

-- 
2.45.2