From e4de9ee7541710cc21c1069c6d13b8c74db38eff Mon Sep 17 00:00:00 2001
From: Jaechul Lee <jcsing.lee@samsung.com>
Date: Mon, 4 Nov 2019 16:16:17 +0900
Subject: [PATCH] arm: dts: bcm2711-rpi-4-b: Adds buttons for speaker profile

Tizen Speaker Profile uses a keypad that consists of 5 buttons for
up/down/left/right/center. The buttons are connected to GPIO pins as
follows.

GPIO16 : KEY_VOLUMEUP
GPIO13 : KEY_VOLUMEDOWN
GPIO6 : KEY_FASTFORWARD
GPIO12 : KEY_REWIND
GPIO25 : KEY_PLAYPAUSE

Change-Id: Iadaa10478c32517ae09c1c10f1d29d0f2518bfb5
Signed-off-by: Jaechul Lee <jcsing.lee@samsung.com>
---
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 66 +++++++++++++++++++++++++++++++++++
 rpi4/boot/config.txt                  |  3 ++
 2 files changed, 69 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 8ff80d6..a392164 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -2,6 +2,7 @@
 /dts-v1/;
 #include "bcm2711.dtsi"
 #include "bcm2835-rpi.dtsi"
+#include <dt-bindings/input/input.h>
 
 / {
 	compatible = "raspberrypi,4-model-b", "brcm,bcm2711";
@@ -22,6 +23,40 @@
 		ethernet0 = &genet;
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		key-volume-up {
+			lable = "volume-up";
+			linux,code = <KEY_VOLUMEUP>;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		key-volume-down {
+			lable = "volume-down";
+			linux,code = <KEY_VOLUMEDOWN>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+	        };
+
+		key-fastforward {
+			lable = "fastforward";
+			linux,code = <KEY_FASTFORWARD>;
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+		};
+
+		key-rewind {
+			lable = "rewind";
+			linux,code = <KEY_REWIND>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		key-playpause {
+			lable = "playpause";
+			linux,code = <KEY_PLAYPAUSE>;
+			gpios = <&gpio 25 GPIO_ACTIVE_LOW>;
+		};
+	};
+
 	leds {
 		act {
 			gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
@@ -420,6 +455,37 @@
 		brcm,function = <BCM2835_FSEL_ALT4>;
 		brcm,pull = <0 2>;
 	};
+
+	/* Needs to describe gpio settings at config.txt */
+	key_volume_up: key_volume_up {
+		brcm,pins = <16>;
+		brcm,function = <1>; /* BCM2835_FSEL_GPIO_IN */
+		brcm,pull = <2>; /* BCM2835_PUD_UP */
+	};
+
+	key_volume_down: key_volume_down {
+		brcm,pins = <13>;
+		brcm,function = <1>;
+		brcm,pull = <2>;
+	};
+
+	key_fastforward: key_fastforward {
+		brcm,pins = <6>;
+		brcm,function = <1>;
+		brcm,pull = <2>;
+	};
+
+	key_rewind: key_rewind {
+		brcm,pins = <12>;
+		brcm,function = <1>;
+		brcm,pull = <2>;
+	};
+
+	key_playpause: key_playpause {
+		brcm,pins = <25>;
+		brcm,function = <1>;
+		brcm,pull = <2>;
+	};
 };
 
 &i2c0if {
diff --git a/rpi4/boot/config.txt b/rpi4/boot/config.txt
index 1dd43e0..8984ea8 100644
--- a/rpi4/boot/config.txt
+++ b/rpi4/boot/config.txt
@@ -77,3 +77,6 @@ disable_camera_led=1
 # Defines the HDMI output group DMT, set defualt mode 720p
 hdmi_group=2
 hdmi_mode=85
+
+# Set gpio pins to Input, Pullup mode.
+gpio=6,12,13,16,25=ip,pu
-- 
2.7.4