[source] ramips: fix DCH-M225 support

[LEDE Commits]

mkresin pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/6cfa7e57887fe1b021cc50b4b7547d2e51240ac1

commit 6cfa7e57887fe1b021cc50b4b7547d2e51240ac1
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 wifi 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 3465c70..3c269a5 100644
--- a/target/linux/ramips/dts/DCH-M225.dts
+++ b/target/linux/ramips/dts/DCH-M225.dts
@@ -89,7 +89,7 @@
 	#sound-dai-cells = <0>;
 	status = "okay";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gpio_i2s_pins>, <&wm8960_mclk_pins>;
+	pinctrl-0 = <&wm8960_mclk_pins>;
 };
 
 &spi0 {
@@ -157,6 +157,11 @@
 			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 1736d9f..af1bda4 100644
--- a/target/linux/ramips/image/mt7620.mk
+++ b/target/linux/ramips/image/mt7620.mk
@@ -445,7 +445,7 @@ 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