From: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx> 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@xxxxxxxxxxxxx. 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@xxxxxxxxxx/ 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
