Merge pull request #1430 from msperl/i2s-on-gpio-28-31

ARM: bcm2708: add overlay to move i2s to gpio28-31 for compute module

Author: pelwell

arch/arm/boot/dts/overlays/Makefile

@@ -37,6 +37,7 @@ dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9548a.dtbo
 dtbo-$(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

arch/arm/boot/dts/overlays/README

@@ -464,6 +464,12 @@ Params: sda1_pin                GPIO pin for SDA1 (2 or 44 - default 2)
                                 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

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 */
+		};
+	};
+};