Add TDM audio on StarFive JH7110

Merge series from Walker Chen <walker.chen@starfivetech.com>:

This patchset adds TDM audio driver for the StarFive JH7110 SoC. The
first patch adds device tree binding for TDM module. The second patch
adds tdm driver support for JH7110 SoC. The last patch adds device tree
node and pins configuration of tdm to JH7110 dts.

The series has been tested on the VisionFive 2 board by plugging an
audio expansion board.

For more information of audio expansion board, you can take a look
at the following webpage:
https://wiki.seeedstudio.com/ReSpeaker_2_Mics_Pi_HAT/

Documentation/devicetree/bindings/sound/starfive,jh7110-tdm.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/starfive,jh7110-tdm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 TDM Controller
+
+description: |
+  The TDM Controller is a Time Division Multiplexed audio interface
+  integrated in StarFive JH7110 SoC, allowing up to 8 channels of
+  audio over a serial interface. The TDM controller can operate both
+  in master and slave mode.
+
+maintainers:
+  - Walker Chen <walker.chen@starfivetech.com>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - starfive,jh7110-tdm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: TDM AHB Clock
+      - description: TDM APB Clock
+      - description: TDM Internal Clock
+      - description: TDM Clock
+      - description: Inner MCLK
+      - description: TDM External Clock
+
+  clock-names:
+    items:
+      - const: tdm_ahb
+      - const: tdm_apb
+      - const: tdm_internal
+      - const: tdm
+      - const: mclk_inner
+      - const: tdm_ext
+
+  resets:
+    items:
+      - description: tdm ahb reset line
+      - description: tdm apb reset line
+      - description: tdm core reset line
+
+  dmas:
+    items:
+      - description: RX DMA Channel
+      - description: TX DMA Channel
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - dmas
+  - dma-names
+  - "#sound-dai-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    tdm@10090000 {
+        compatible = "starfive,jh7110-tdm";
+        reg = <0x10090000 0x1000>;
+        clocks = <&syscrg 184>,
+                 <&syscrg 185>,
+                 <&syscrg 186>,
+                 <&syscrg 187>,
+                 <&syscrg 17>,
+                 <&tdm_ext>;
+        clock-names = "tdm_ahb", "tdm_apb",
+                      "tdm_internal", "tdm",
+                      "mclk_inner", "tdm_ext";
+        resets = <&syscrg 105>,
+                 <&syscrg 107>,
+                 <&syscrg 106>;
+        dmas = <&dma 20>, <&dma 21>;
+        dma-names = "rx","tx";
+        #sound-dai-cells = <0>;
+    };

MAINTAINERS

@@ -20127,6 +20127,12 @@ F:	Documentation/devicetree/bindings/power/starfive*
 F:	drivers/soc/starfive/jh71xx_pmu.c
 F:	include/dt-bindings/power/starfive,jh7110-pmu.h
 
+STARFIVE JH7110 TDM DRIVER
+M:	Walker Chen <walker.chen@starfivetech.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/sound/starfive,jh7110-tdm.yaml
+F:	sound/soc/starfive/jh7110_tdm.c
+
 STARFIVE SOC DRIVERS
 M:	Conor Dooley <conor@kernel.org>
 S:	Maintained

sound/soc/Kconfig

@@ -92,6 +92,7 @@ source "sound/soc/sh/Kconfig"
 source "sound/soc/sof/Kconfig"
 source "sound/soc/spear/Kconfig"
 source "sound/soc/sprd/Kconfig"
+source "sound/soc/starfive/Kconfig"
 source "sound/soc/sti/Kconfig"
 source "sound/soc/stm/Kconfig"
 source "sound/soc/sunxi/Kconfig"

sound/soc/Makefile

@@ -60,6 +60,7 @@ obj-$(CONFIG_SND_SOC)	+= sh/
 obj-$(CONFIG_SND_SOC)	+= sof/
 obj-$(CONFIG_SND_SOC)	+= spear/
 obj-$(CONFIG_SND_SOC)	+= sprd/
+obj-$(CONFIG_SND_SOC)	+= starfive/
 obj-$(CONFIG_SND_SOC)	+= sti/
 obj-$(CONFIG_SND_SOC)	+= stm/
 obj-$(CONFIG_SND_SOC)	+= sunxi/

sound/soc/starfive/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+config SND_SOC_STARFIVE
+	tristate "Audio support for StarFive SoC"
+	depends on COMPILE_TEST || ARCH_STARFIVE
+	help
+	  Say Y or M if you want to add support for codecs attached to
+	  the Starfive SoCs' Audio interfaces. You will also need to
+	  select the audio interfaces to support below.
+
+config SND_SOC_JH7110_TDM
+	tristate "JH7110 TDM device driver"
+	depends on HAVE_CLK && SND_SOC_STARFIVE
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y or M if you want to add support for StarFive TDM driver.

sound/soc/starfive/Makefile

+# StarFive Platform Support
+obj-$(CONFIG_SND_SOC_JH7110_TDM) += jh7110_tdm.o