sound: airoha: add support for AN7581 PCM driver

The Airoha AN7581 SoC have alternative Sound Card that expose PCM OPs dedicated for VoIP application.

---

This is posted as RFC waiting for Airoha to verify correct functionality with ZSI or SLIC Voip chip.

Some register/compatible related stuff will be dropped in the final version.

Driver has been verified by enabling internal loopback mode.

Changes v2:
- Rentirely rework IRQ handling
- Fix problem for timeslow configuration
- Better support duplex mode
- Better handle descriptor tracking
- Move to Soc directory
- General code fixup and cleanup

 sound/soc/Kconfig             |   1 +
 sound/soc/Makefile            |   1 +
 sound/soc/airoha/Kconfig      |  10 +
 sound/soc/airoha/Makefile     |   3 +
 sound/soc/airoha/an7581-pcm.c | 926 ++++++++++++++++++++++++++++++++++
 5 files changed, 941 insertions(+)
 create mode 100644 sound/soc/airoha/Kconfig
 create mode 100644 sound/soc/airoha/Makefile
 create mode 100644 sound/soc/airoha/an7581-pcm.c

index edfdcbf734fe..27fc13e11b77 100644
@@ -103,6 +103,7 @@ config SND_SOC_USB
 
 # All the supported SoCs
 source "sound/soc/adi/Kconfig"
+source "sound/soc/airoha/Kconfig"
 source "sound/soc/amd/Kconfig"
 source "sound/soc/apple/Kconfig"
 source "sound/soc/atmel/Kconfig"

index 21d8406767fc..ea581930bb3d 100644
@@ -46,6 +46,7 @@ obj-$(CONFIG_SND_SOC)	+= codecs/
 obj-$(CONFIG_SND_SOC)	+= generic/
 obj-$(CONFIG_SND_SOC)	+= apple/
 obj-$(CONFIG_SND_SOC)	+= adi/
+obj-$(CONFIG_SND_SOC)	+= airoha/
 obj-$(CONFIG_SND_SOC)	+= amd/
 obj-$(CONFIG_SND_SOC)	+= atmel/
 obj-$(CONFIG_SND_SOC)	+= au1x/

new file mode 100644
index 000000000000..20c9211430c9
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config SND_SOC_AN7581_PCM
+	tristate "PCM support for Airoha AN7581 chip"
+	depends on ARCH_AIROHA || COMPILE_TEST
+	help
+	  This adds PCM driver for Airoha AN7581 boards
+	  that can be used with other codecs.
+	  Select Y if you have such device.
+	  If unsure select "N".

new file mode 100644
index 000000000000..2522fe705d9a
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SND_SOC_AN7581_PCM) += an7581-pcm.o

2.55.0

Please submit patches using subject lines reflecting the style for the subsystem, this makes it easier for people to identify relevant patches. Look at what existing commits in the area you're changing are doing and make sure your subject lines visually resemble what they're doing. There's no need to resubmit to fix this alone.