From a10aaa00964e6543b3c310fa982d893f468378a8 Mon Sep 17 00:00:00 2001
From: Florin Sarbu <florin@resin.io>
Date: Mon, 30 Apr 2018 09:11:52 +0200
Subject: [PATCH 320/321] overlays: Add support for Balena Fin board

Signed-off-by: Florin Sarbu <florin@resin.io>
---
 arch/arm/boot/dts/overlays/Makefile               |  1 +
 arch/arm/boot/dts/overlays/README                 |  7 ++
 arch/arm/boot/dts/overlays/balena-fin-overlay.dts | 79 +++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/balena-fin-overlay.dts

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index 22f7aa2952aa..a22141d24850 100644
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -17,6 +17,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	audioinjector-addons.dtbo \
 	audioinjector-wm8731-audio.dtbo \
 	audremap.dtbo \
+	balena-fin.dtbo \
 	bmp085_i2c-sensor.dtbo \
 	dht11.dtbo \
 	dionaudio-loco.dtbo \
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 37484904c2d5..bea703661027 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -404,6 +404,13 @@ Params: swap_lr                 Reverse the channel allocation, which will also
                                 (default off)
 
 
+Name:   balena-fin
+Info:   Overlay that enables WiFi, Bluetooth and the GPIO expander on the
+        Balena Fin board.
+Load:   dtoverlay=balena-fin
+Params: <None>
+
+
 Name:   bmp085_i2c-sensor
 Info:   This overlay is now deprecated - see i2c-sensor
 Load:   dtoverlay=bmp085_i2c-sensor
diff --git a/arch/arm/boot/dts/overlays/balena-fin-overlay.dts b/arch/arm/boot/dts/overlays/balena-fin-overlay.dts
new file mode 100644
index 000000000000..269ab7d72938
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/balena-fin-overlay.dts
@@ -0,0 +1,79 @@
+/dts-v1/;
+/plugin/;
+
+/{
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&mmc>;
+		sdio_wifi: __overlay__ {
+			pinctrl-names = "default";
+			pinctrl-0 = <&sdio_pins>;
+			bus-width = <4>;
+			brcm,overclock-50 = <35>;
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			sdio_pins: sdio_pins {
+				brcm,pins = <34 35 36 37 38 39>;
+				brcm,function = <7>; /* ALT3 = SD1 */
+				brcm,pull = <0 2 2 2 2 2>;
+			};
+
+			power_ctrl_pins: power_ctrl_pins {
+				brcm,pins = <40>;
+				brcm,function = <1>; // out
+			};
+		};
+	};
+
+	fragment@2 {
+		target-path = "/";
+		__overlay__ {
+			// We should investigate how to switch to mmc-pwrseq-sd8787
+			// Currently that module requires two GPIOs to function since it
+			// targets a slightly different chip
+			power_ctrl: power_ctrl {
+				compatible = "gpio-poweroff";
+				gpios = <&gpio 40 1>;
+				force;
+			};
+
+			i2c_soft: i2c@0 {
+				compatible = "i2c-gpio";
+				gpios = <&gpio 43 0 /* sda */ &gpio 42 0 /* scl */>;
+				i2c-gpio,delay-us = <2>; /* ~100 kHz */
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
+		};
+	};
+
+	fragment@3 {
+		target = <&i2c_soft>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			gpio_expander: gpio_expander@20 {
+				compatible = "nxp,pca9554";
+				gpio-controller;
+				#gpio-cells = <2>;
+				reg = <0x20>;
+				status = "okay";
+			};
+
+			// rtc clock
+			ds1307: ds1307@68 {
+				compatible = "maxim,ds1307";
+				reg = <0x68>;
+				status = "okay";
+			};
+		};
+	};
+};
-- 
2.16.1