[source] ramips: fix DCH-M225 support

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/a783185e280f5b8d7ca5c7a1a4f5adad8a287637

commit a783185e280f5b8d7ca5c7a1a4f5adad8a287637
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Sat Nov 18 11:59:22 2017 +0100

    ramips: fix DCH-M225 support
    
    Setting the pins of the UARTF group to GPIO+I2S at the time the I2C
    driver loads is to late for the wps GPIO button.
    
    The gpio-keys driver fails to load since the pin used by the wps button
    is not yet set to GPIO. The wps button with the rfkill keycode is
    essential for this wireless only board.
    
    Add the missing sound and I2C kernel modules corresponding to the
    device nodes.
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 target/linux/ramips/dts/DCH-M225.dts | 7 ++++++-
 target/linux/ramips/image/mt7620.mk  | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/linux/ramips/dts/DCH-M225.dts b/target/linux/ramips/dts/DCH-M225.dts
index 867335e..5856036 100644
--- a/target/linux/ramips/dts/DCH-M225.dts
+++ b/target/linux/ramips/dts/DCH-M225.dts
@@ -90,7 +90,7 @@
 	#sound-dai-cells = <0>;
 	status = "okay";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gpio_i2s_pins>, <&wm8960_mclk_pins>;
+	pinctrl-0 = <&wm8960_mclk_pins>;
 };
 
 &spi0 {
@@ -158,6 +158,11 @@
 			ralink,function = "gpio";
 		};
 
+		gpio_i2s {
+			ralink,group = "uartf";
+			ralink,function = "gpio i2s";
+		};
+
 		pa {
 			ralink,group = "pa";
 			ralink,function = "pa";
diff --git a/target/linux/ramips/image/mt7620.mk b/target/linux/ramips/image/mt7620.mk
index 796cc61..ab03cf1 100644
--- a/target/linux/ramips/image/mt7620.mk
+++ b/target/linux/ramips/image/mt7620.mk
@@ -139,7 +139,7 @@ define Device/dch-m225
 	seama-seal -m "signature=wapn22_dlink.2013gui_dap1320b" | \
 	check-size $$$$(IMAGE_SIZE)
   DEVICE_TITLE := D-Link DCH-M225
-  DEVICE_PACKAGES := kmod-mt76
+  DEVICE_PACKAGES := kmod-mt76 kmod-sound-core kmod-sound-mt7620 kmod-i2c-ralink
 endef
 TARGET_DEVICES += dch-m225