[PATCH v2 6/6] arm64: dts: amlogic: gx: add AUDIN node

AUDIN provides audio input support to Amlogic Meson GXBB/GXL platforms.

What's missing after this to get capture support working is to connect a
capture capable codec to the SoC. For example to test these changes an
NXP SGTL5000 chip has been connected to an OdroidC2 (Meson GXBB) board
using a custom hat board.

The following additions/overlay are required on top of
'amlogic/meson-gxbb-odroidc2.dts' to make that hat board to work:

    &sound {
            audio-routing = "AUDIN I2S Formatter", "AIU I2S Encoder Capture";

            dai-link-1 {
                    codec-1 {
                            sound-dai = <&sgtl5000>;
                    };
            };

            dai-link-3 {
                    sound-dai = <&audin 0>;
            };
    };

    &audin {
            status = "okay";
    };

Then, from userspace:

    $ amixer sset 'AUDIN FIFO0 SRC SEL' 'I2S'
    $ arecord -l  # find the "FIFO Capture" device
    $ arecord -D hw:0,<N> -f S16_LE -r 48000 -c 2 /tmp/in.wav

Signed-off-by: Valerio Setti <redacted>
---
 arch/arm64/boot/dts/amlogic/meson-gx.dtsi   | 9 +++++++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 6 ++++++
 arch/arm64/boot/dts/amlogic/meson-gxl.dtsi  | 6 ++++++
 3 files changed, 21 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
index c1d8e81d95cb..54b6cc0bb8ff 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi

@@ -436,6 +436,15 @@ watchdog@98d0 {
 				reg = <0x0 0x098d0 0x0 0x10>;
 				clocks = <&xtal>;
 			};
+
+			audin: audio-controller@a000 {
+				compatible = "amlogic,gx-audin";
+				reg = <0x0 0xa000 0x0 0x148>;
+				interrupts = <GIC_SPI 7 IRQ_TYPE_EDGE_RISING>;
+				sound-name-prefix = "AUDIN";
+				#sound-dai-cells = <1>;
+				status = "disabled";
+			};
 		};
 
 		gic: interrupt-controller@c4301000 {

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index a9c830a570cc..7ad69992a226 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi

@@ -84,6 +84,12 @@ &aiu {
 	resets = <&reset RESET_AIU>;
 };
 
+&audin {
+	compatible = "amlogic,gxbb-audin", "amlogic,gx-audin";
+	clocks = <&clkc CLKID_I2S_SPDIF>;
+	resets = <&reset RESET_AUDIN>;
+};
+
 &aobus {
 	pinctrl_aobus: pinctrl@14 {
 		compatible = "amlogic,meson-gxbb-aobus-pinctrl";

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
index d5e0f72892f8..9181eba81eb7 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi

@@ -100,6 +100,12 @@ &aiu {
 	resets = <&reset RESET_AIU>;
 };
 
+&audin {
+	compatible = "amlogic,gxl-audin", "amlogic,gx-audin";
+	clocks = <&clkc CLKID_I2S_SPDIF>;
+	resets = <&reset RESET_AUDIN>;
+};
+
 &apb {
 	usb2_phy0: phy@78000 {
 		compatible = "amlogic,meson-gxl-usb2-phy";

-- 
2.47.3