openwrt/target/linux/brcm2708/patches-4.4/0301-ARM-bcm2835-add-i2s-gpio28-31-for-cm.patch

From e64de6a371f40d4d1b3333e2b85ca8aa0b52fe74 Mon Sep 17 00:00:00 2001
From: Martin Sperl <kernel@martin.sperl.org>
Date: Sat, 23 Apr 2016 15:21:41 +0000
Subject: [PATCH] ARM: bcm2835: add i2s-gpio28-31 for cm

Add i2s-gpio28-31 overlay for compute module
so that i2s is using gpio28-31

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
---
 arch/arm/boot/dts/overlays/Makefile                  |  1 +
 arch/arm/boot/dts/overlays/README                    |  6 ++++++
 arch/arm/boot/dts/overlays/i2s-gpio28-31-overlay.dts | 18 ++++++++++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/i2s-gpio28-31-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -37,6 +37,7 @@ dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca95
 dtbo-$(RPI_DT_OVERLAYS) += i2c-pwm-pca9685a.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c1-bcm2708.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += i2s-gpio28-31.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2s-mmap.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += iqaudio-dac.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += iqaudio-dacplus.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -464,6 +464,12 @@ Params: sda1_pin                GPIO pin
                                 default 4)
 
 
+Name:   i2s-gpio28-31
+Info:   move I2S function block to GPIO 28 to 31
+Load:   dtoverlay=i2s-gpio28-31
+Params: <None>
+
+
 Name:   i2s-mmap
 Info:   Enables mmap support in the bcm2708-i2s driver
 Load:   dtoverlay=i2s-mmap
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/i2s-gpio28-31-overlay.dts
@@ -0,0 +1,18 @@
+/*
+ * Device tree overlay to move i2s to gpio 28 to 31 on CM
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
+
+	fragment@0 {
+		target = <&i2s_pins>;
+		__overlay__ {
+			brcm,pins = <28 29 30 31>;
+			brcm,function = <6>; /* alt2 */
+		};
+	};
+};