linux-kernel - [PATCH v2 0/5] ASoC: wm8904: Add DMIC and DRC support

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Message-Id: <20250224155500.52462-1-francesco@dolcini.it>
Date: Mon, 24 Feb 2025 16:54:55 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	patches@...nsource.cirrus.com
Cc: Francesco Dolcini <francesco.dolcini@...adex.com>,
	linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ckeepax@...nsource.cirrus.com
Subject: [PATCH v2 0/5] ASoC: wm8904: Add DMIC and DRC support

From: Francesco Dolcini <francesco.dolcini@...adex.com>

This patch series adds DMIC and DRC support to the WM8904 driver, a new
of_ helper is added to simplify the driver code.

DRC functionality is added in the same patch series to provide the
necessary dynamic range control to make DMIC support useful.

The WM8904 supports digital microphones on two of its inputs:
IN1L/DMICDAT1 and IN1R/DMICDAT2. These two inputs can either be
connected to an ADC or to the DMIC system. There is an ADC for each
line, and only one DMIC block. This DMIC block is either connected to
DMICDAT1 or to DMICDAT2. One DMIC data line supports two digital
microphones via time multiplexing.

The pin's functionality is decided during hardware design (IN1L vs
DMICDAT1 and IN1R vs DMICDAT2). This is reflected in the Device Tree.

If one line is analog and one is DMIC, we need to be able to switch
between ADC and DMIC at runtime. The DMIC source is known from the
Device Tree. If both are DMIC inputs, we need to be able to switch the
DMIC source. There is no need to switch between ADC and DMIC at runtime.

Therefore, kcontrols are dynamically added by the driver depending on
its Device Tree configuration.

This is a heavy rework of a previous patch series provided by Alifer
Moraes and Pierluigi Passaro,
https://lore.kernel.org/lkml/20220307141041.27538-1-alifer.m@variscite.com.

v2:
 * Fixed a bug in wm8904_parse_retune_cfg_from_of()
 * Added full usage example of the three ReTune Mobile config properties in the
   DT binding.
 * Improved the DAPM routing:
   * Only add IN1L/IN1R routes to ADCL/ADCR conditionally depending on which
     DMIC is in use.
   * Do not connect PGAs to ADC when they are not needed.
   * Keep the mux between ADC/DMIC even when two DMICs are used, as the IN1
     pins share a mux with IN2 and IN3 and the ADC could still be used for
     them.

v1: https://lore.kernel.org/all/20250206163152.423199-1-francesco@dolcini.it/

Ernest Van Hoecke (5):
  of: Add of_property_read_u16_index
  ASoC: wm8904: Don't touch GPIO configs set to 0xFFFF
  ASoC: dt-bindings: wm8904: Add DMIC, GPIO, MIC and EQ support
  ASoC: wm8904: get platform data from DT
  ASoC: wm8904: add DMIC support

 .../devicetree/bindings/sound/wlf,wm8904.yaml | 106 ++++++
 drivers/of/property.c                         |  33 ++
 include/linux/of.h                            |   9 +
 include/sound/wm8904.h                        |   3 +
 sound/soc/codecs/wm8904.c                     | 317 +++++++++++++++++-
 5 files changed, 461 insertions(+), 7 deletions(-)

-- 
2.39.5