ASoC: codecs: add new pm4125 audio codec driver

The audio codec is found in Qualcomm PM2250/PM4125 PMICs and is used on
platforms like Qualcomm QCM2290. It has soundwire interface and
corresponding RX and TX slave devices.

It has only two input channels: HPH left and right. The line output (LO)
is linked to HPHL so the hardware has some limitations regarding concurrent
playback via HPH and LO for instance.

The codec driver also uses WCD MBCH framework. The MBHC functionality is
implemented in a minimalistic way to enable IRQs and avoid different
issues with IRQs.

Co-developed-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Link: https://patch.msgid.link/20250915-pm4125_audio_codec_v1-v4-3-b247b64eec52@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: laklimov

sound/soc/codecs/Kconfig

@@ -192,6 +192,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_PCM512x_SPI
 	imply SND_SOC_PCM6240
 	imply SND_SOC_PEB2466
+	imply SND_SOC_PM4125_SDW
 	imply SND_SOC_RK3308
 	imply SND_SOC_RK3328
 	imply SND_SOC_RK817
@@ -1542,6 +1543,23 @@ config SND_SOC_PEB2466
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-soc-peb2466.
 
+config SND_SOC_PM4125
+	depends on SND_SOC_PM4125_SDW
+	tristate
+	depends on SOUNDWIRE || !SOUNDWIRE
+
+config SND_SOC_PM4125_SDW
+	tristate "PM4125 audio codec - SDW"
+	select SND_SOC_PM4125
+	select SND_SOC_WCD_MBHC
+	select REGMAP_IRQ
+	depends on SOUNDWIRE
+	select REGMAP_SOUNDWIRE
+	help
+	  The PMIC PM4125 has an in-built audio codec IC used with SoCs
+	  like QCM2290, and it is connected via soundwire and SPMI.
+	  To compile this codec driver say Y or m.
+
 config SND_SOC_RK3308
 	tristate "Rockchip RK3308 audio CODEC"
 	depends on ARM64 || COMPILE_TEST

sound/soc/codecs/Makefile

@@ -222,6 +222,8 @@ snd-soc-pcm512x-i2c-y := pcm512x-i2c.o
 snd-soc-pcm512x-spi-y := pcm512x-spi.o
 snd-soc-pcm6240-y := pcm6240.o
 snd-soc-peb2466-y := peb2466.o
+snd-soc-pm4125-y := pm4125.o
+snd-soc-pm4125-sdw-y := pm4125-sdw.o
 snd-soc-rk3308-y := rk3308_codec.o
 snd-soc-rk3328-y := rk3328_codec.o
 snd-soc-rk817-y := rk817_codec.o
@@ -642,6 +644,12 @@ obj-$(CONFIG_SND_SOC_PCM512x_I2C)	+= snd-soc-pcm512x-i2c.o
 obj-$(CONFIG_SND_SOC_PCM512x_SPI)	+= snd-soc-pcm512x-spi.o
 obj-$(CONFIG_SND_SOC_PCM6240)	+= snd-soc-pcm6240.o
 obj-$(CONFIG_SND_SOC_PEB2466)	+= snd-soc-peb2466.o
+obj-$(CONFIG_SND_SOC_PM4125_SDW) += snd-soc-pm4125-sdw.o
+obj-$(CONFIG_SND_SOC_PM4125)   += snd-soc-pm4125.o
+ifdef CONFIG_SND_SOC_PM4125_SDW
+# avoid link failure by forcing sdw code built-in when needed
+obj-$(CONFIG_SND_SOC_PM4125) += snd-soc-pm4125-sdw.o
+endif
 obj-$(CONFIG_SND_SOC_RK3308)	+= snd-soc-rk3308.o
 obj-$(CONFIG_SND_SOC_RK3328)	+= snd-soc-rk3328.o
 obj-$(CONFIG_SND_SOC_RK817)	+= snd-soc-rk817.o