Add the Renesas IDT821034 codec support

Merge series from Herve Codina <herve.codina@bootlin.com>:

The Renesas IDT821034 codec is four channel PCM codec with on-chip
filters and programmable gain setting.  It also provides SLIC
(Subscriber Line Interface Circuit) signals as GPIOs.

Documentation/devicetree/bindings/sound/renesas,idt821034.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/renesas,idt821034.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas IDT821034 codec device
+
+maintainers:
+  - Herve Codina <herve.codina@bootlin.com>
+
+description: |
+  The IDT821034 codec is a four channel PCM codec with onchip filters and
+  programmable gain setting.
+
+  The time-slots used by the codec must be set and so, the properties
+  'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
+  'dai-tdm-slot-rx-mask' must be present in the ALSA sound card node for
+  sub-nodes that involve the codec. The codec uses one 8bit time-slot per
+  channel.
+  'dai-tdm-tdm-slot-with' must be set to 8.
+
+  The IDT821034 codec also supports 5 gpios (SLIC signals) per channel.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: renesas,idt821034
+
+  reg:
+    description:
+      SPI device address.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 8192000
+
+  spi-cpha: true
+
+  '#sound-dai-cells':
+    const: 0
+
+  '#gpio-cells':
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - reg
+  - spi-cpha
+  - '#sound-dai-cells'
+  - gpio-controller
+  - '#gpio-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        audio-codec@0 {
+            compatible = "renesas,idt821034";
+            reg = <0>;
+            spi-max-frequency = <8192000>;
+            spi-cpha;
+            #sound-dai-cells = <0>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };

MAINTAINERS

@@ -17790,6 +17790,13 @@ F:	Documentation/devicetree/bindings/net/renesas,*.yaml
 F:	drivers/net/ethernet/renesas/
 F:	include/linux/sh_eth.h
 
+RENESAS IDT821034 ASoC CODEC
+M:	Herve Codina <herve.codina@bootlin.com>
+L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
+S:	Maintained
+F:	Documentation/devicetree/bindings/sound/renesas,idt821034.yaml
+F:	sound/soc/codecs/idt821034.c
+
 RENESAS R-CAR GYROADC DRIVER
 M:	Marek Vasut <marek.vasut@gmail.com>
 L:	linux-iio@vger.kernel.org

sound/soc/codecs/Kconfig

@@ -107,6 +107,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_HDAC_HDMI
 	imply SND_SOC_HDAC_HDA
 	imply SND_SOC_ICS43432
+	imply SND_SOC_IDT821034
 	imply SND_SOC_INNO_RK3036
 	imply SND_SOC_ISABELLE
 	imply SND_SOC_JZ4740_CODEC
@@ -973,6 +974,16 @@ config SND_SOC_HDA
 config SND_SOC_ICS43432
 	tristate "ICS43423 and compatible i2s microphones"
 
+config SND_SOC_IDT821034
+	tristate "Renesas IDT821034 quad PCM codec"
+	depends on SPI
+	help
+	  Enable support for the Renesas IDT821034 quad PCM with
+	  programmable gain codec.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-soc-idt821034.
+
 config SND_SOC_INNO_RK3036
 	tristate "Inno codec driver for RK3036 SoC"
 	select REGMAP_MMIO

sound/soc/codecs/Makefile

@@ -111,6 +111,7 @@ snd-soc-hdac-hdmi-objs := hdac_hdmi.o
 snd-soc-hdac-hda-objs := hdac_hda.o
 snd-soc-hda-codec-objs := hda.o hda-dai.o
 snd-soc-ics43432-objs := ics43432.o
+snd-soc-idt821034-objs := idt821034.o
 snd-soc-inno-rk3036-objs := inno_rk3036.o
 snd-soc-isabelle-objs := isabelle.o
 snd-soc-jz4740-codec-objs := jz4740.o
@@ -473,6 +474,7 @@ obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
 obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o
 obj-$(CONFIG_SND_SOC_HDA) += snd-soc-hda-codec.o
 obj-$(CONFIG_SND_SOC_ICS43432)	+= snd-soc-ics43432.o
+obj-$(CONFIG_SND_SOC_IDT821034)	+= snd-soc-idt821034.o
 obj-$(CONFIG_SND_SOC_INNO_RK3036)	+= snd-soc-inno-rk3036.o
 obj-$(CONFIG_SND_SOC_ISABELLE)	+= snd-soc-isabelle.o
 obj-$(CONFIG_SND_SOC_JZ4740_CODEC)	+= snd-soc-jz4740-codec.o