openwrt/target/linux/brcm2708/patches-4.14/950-0235-overlays-Add-overlay-for-PiBell-soundcard.patch

From 36a2db8647b19b0c8576a10ab787b14098049f9b Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 28 Feb 2018 21:29:42 +0000
Subject: [PATCH 235/454] overlays: Add overlay for PiBell soundcard

This overlay is presented as another example of using the simple card
driver.

See: https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=99784&p=1279490#p1278971

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  7 ++
 arch/arm/boot/dts/overlays/pibell-overlay.dts | 81 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/pibell-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -76,6 +76,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	pi3-disable-bt.dtbo \
 	pi3-disable-wifi.dtbo \
 	pi3-miniuart-bt.dtbo \
+	pibell.dtbo \
 	piscreen.dtbo \
 	piscreen2r.dtbo \
 	pisound.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1182,6 +1182,13 @@ Load:   dtoverlay=pi3-miniuart-bt
 Params: <None>
 
 
+Name:   pibell
+Info:   Configures the pibell audio card.
+Load:   dtoverlay=pibell,<param>=<val>
+Params: alsaname                Set the name as it appears in ALSA (default
+                                "PiBell")
+
+
 Name:   piscreen
 Info:   PiScreen display by OzzMaker.com
 Load:   dtoverlay=piscreen,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pibell-overlay.dts
@@ -0,0 +1,81 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+    compatible = "brcm,bcm2708";
+
+    fragment@0 {
+        target-path = "/";
+        __overlay__ {
+            codec_out: spdif-transmitter {
+                #address-cells = <0>;
+                #size-cells = <0>;
+                #sound-dai-cells = <0>;
+                compatible = "linux,spdif-dit";
+                status = "okay";
+            };
+
+            codec_in: card-codec {
+                #sound-dai-cells = <0>;
+                compatible = "invensense,ics43432";
+                status = "okay";
+            };
+        };
+    };
+
+    fragment@1 {
+        target = <&i2s>;
+        __overlay__ {
+            #sound-dai-cells = <0>;
+            status = "okay";
+        };
+    };
+
+    fragment@2 {
+        target = <&sound>;
+        snd: __overlay__ {
+            compatible = "simple-audio-card";
+            simple-audio-card,name = "PiBell";
+
+            status="okay";
+
+            capture_link: simple-audio-card,dai-link@0 {
+                format = "i2s";
+
+                r_cpu_dai: cpu {
+                    sound-dai = <&i2s>;
+
+/* example TDM slot configuration
+                    dai-tdm-slot-num = <2>;
+                    dai-tdm-slot-width = <32>;
+*/
+                };
+
+                r_codec_dai: codec {
+                    sound-dai = <&codec_in>;
+                };
+            };
+
+            playback_link: simple-audio-card,dai-link@1 {
+                format = "i2s";
+
+                p_cpu_dai: cpu {
+                    sound-dai = <&i2s>;
+
+/* example TDM slot configuration
+                    dai-tdm-slot-num = <2>;
+                    dai-tdm-slot-width = <32>;
+*/
+                };
+
+                p_codec_dai: codec {
+                    sound-dai = <&codec_out>;
+                };
+            };
+        };
+    };
+
+    __overrides__ {
+        alsaname = <&snd>, "simple-audio-card,name";
+    };
+};