From 3a8d33418117261b9d8423ac792b414947683b6d Mon Sep 17 00:00:00 2001
From: Dave Stevenson <6by9@users.noreply.github.com>
Date: Fri, 1 Apr 2016 15:28:46 +0100
Subject: [PATCH] RPi config: Add CONFIG_PWM_PCA9685 for NXP PCA9685 driver
 over I2C

Includes DT overlay to configure it.

Signed-off-by: Dave Stevenson <6by9@users.noreply.github.com>
---
 arch/arm/boot/dts/overlays/Makefile                |  1 +
 arch/arm/boot/dts/overlays/README                  |  6 +++++
 .../boot/dts/overlays/i2c-pwm-pca9685a-overlay.dts | 26 ++++++++++++++++++++++
 arch/arm/configs/bcm2709_defconfig                 |  1 +
 arch/arm/configs/bcmrpi_defconfig                  |  1 +
 5 files changed, 35 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/i2c-pwm-pca9685a-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -30,6 +30,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hy28b.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo
 dtbo-$(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-mmap.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -366,6 +366,12 @@ Load:   dtoverlay=i2c-mux-pca9548a,<para
 Params: addr                    I2C address of PCA9548A (default 0x70)
 
 
+Name:   i2c-pwm-pca9685a
+Info:   Adds support for an NXP PCA9685A I2C PWM controller on i2c_arm
+Load:   dtoverlay=i2c-pwm-pca9685a,<param>=<val>
+Params: addr                    I2C address of PCA9685A (default 0x40)
+
+
 Name:   i2c-rtc
 Info:   Adds support for a number of I2C Real Time Clock devices
 Load:   dtoverlay=i2c-rtc,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/i2c-pwm-pca9685a-overlay.dts
@@ -0,0 +1,26 @@
+// Definitions for NXP PCA9685A I2C PWM controller on ARM I2C bus.
+/dts-v1/;
+/plugin/;
+
+/{
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2c_arm>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pca: pca@40 {
+				compatible = "nxp,pca9685";
+				#pwm-cells = <2>;
+				reg = <0x40>;
+				status = "okay";
+			};
+		};
+	};
+	__overrides__ {
+		addr = <&pca>,"reg:0";
+	};
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -1122,6 +1122,7 @@ CONFIG_MCP320X=m
 CONFIG_MCP3422=m
 CONFIG_DHT11=m
 CONFIG_PWM_BCM2835=m
+CONFIG_PWM_PCA9685=m
 CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -1129,6 +1129,7 @@ CONFIG_MCP320X=m
 CONFIG_MCP3422=m
 CONFIG_DHT11=m
 CONFIG_PWM_BCM2835=m
+CONFIG_PWM_PCA9685=m
 CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y