ASoC: ssm3515: Add new amp driver

The Analog Devices' SSM3515 is a mono audio amplifier with digital
input, equipped on Apple's 2021 iMacs. Add an ASoC driver for it, and
register both the driver code and schema in MAINTAINERS.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org
Link: https://lore.kernel.org/r/20230511150546.8499-3-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org

MAINTAINERS

@@ -1990,9 +1990,11 @@ M:	Martin Povišer <povik+lin@cutebit.org>
 L:	asahi@lists.linux.dev
 L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
 S:	Maintained
+F:	Documentation/devicetree/bindings/sound/adi,ssm3515.yaml
 F:	Documentation/devicetree/bindings/sound/apple,*
 F:	sound/soc/apple/*
 F:	sound/soc/codecs/cs42l83-i2c.c
+F:	sound/soc/codecs/ssm3515.c
 
 ARM/ARTPEC MACHINE SUPPORT
 M:	Jesper Nilsson <jesper.nilsson@axis.com>

sound/soc/codecs/Kconfig

@@ -1659,6 +1659,12 @@ config SND_SOC_SSM2602_I2C
 	select SND_SOC_SSM2602
 	select REGMAP_I2C
 
+config SND_SOC_SSM3515
+	tristate "Analog Devices SSM3515 amplifier driver"
+	select REGMAP_I2C
+	depends on I2C
+	depends on OF
+
 config SND_SOC_SSM4567
 	tristate "Analog Devices ssm4567 amplifier driver support"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -257,6 +257,7 @@ snd-soc-ssm2518-objs := ssm2518.o
 snd-soc-ssm2602-objs := ssm2602.o
 snd-soc-ssm2602-spi-objs := ssm2602-spi.o
 snd-soc-ssm2602-i2c-objs := ssm2602-i2c.o
+snd-soc-ssm3515-objs := ssm3515.o
 snd-soc-ssm4567-objs := ssm4567.o
 snd-soc-sta32x-objs := sta32x.o
 snd-soc-sta350-objs := sta350.o
@@ -625,6 +626,7 @@ obj-$(CONFIG_SND_SOC_SSM2518)	+= snd-soc-ssm2518.o
 obj-$(CONFIG_SND_SOC_SSM2602)	+= snd-soc-ssm2602.o
 obj-$(CONFIG_SND_SOC_SSM2602_SPI)	+= snd-soc-ssm2602-spi.o
 obj-$(CONFIG_SND_SOC_SSM2602_I2C)	+= snd-soc-ssm2602-i2c.o
+obj-$(CONFIG_SND_SOC_SSM3515)	+= snd-soc-ssm3515.o
 obj-$(CONFIG_SND_SOC_SSM4567)	+= snd-soc-ssm4567.o
 obj-$(CONFIG_SND_SOC_STA32X)   += snd-soc-sta32x.o
 obj-$(CONFIG_SND_SOC_STA350)   += snd-soc-sta350.o