From c286380fe677e404af0a1226c6589b3f24fafc6c Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 20 Feb 2018 17:32:02 +0000
Subject: [PATCH 227/454] overlays: Add sc16is752-i2c overlay

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             | 15 +++++--
 .../dts/overlays/sc16is752-i2c-overlay.dts    | 40 +++++++++++++++++++
 3 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm/boot/dts/overlays/sc16is752-i2c-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -100,6 +100,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	rpi-tv.dtbo \
 	rra-digidac1-wm8741-audio.dtbo \
 	sc16is750-i2c.dtbo \
+	sc16is752-i2c.dtbo \
 	sc16is752-spi1.dtbo \
 	sdhost.dtbo \
 	sdio.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1447,14 +1447,23 @@ Params: <None>
 
 Name:   sc16is750-i2c
 Info:   Overlay for the NXP SC16IS750 UART with I2C Interface
-        Enables the chip on I2C1 at 0x48. To select another address,
-        please refer to table 10 in reference manual.
-
+        Enables the chip on I2C1 at 0x48 (or the "addr" parameter value). To
+        select another address, please refer to table 10 in reference manual.
 Load:   dtoverlay=sc16is750-i2c,<param>=<val>
 Params: int_pin                 GPIO used for IRQ (default 24)
         addr                    Address (default 0x48)
 
 
+Name:   sc16is752-i2c
+Info:   Overlay for the NXP SC16IS752 dual UART with I2C Interface
+        Enables the chip on I2C1 at 0x48 (or the "addr" parameter value). To
+        select another address, please refer to table 10 in reference manual.
+Load:   dtoverlay=sc16is752-i2c,<param>=<val>
+Params: int_pin                 GPIO used for IRQ (default 24)
+        addr                    Address (default 0x48)
+        xtal                    On-board crystal frequency (default 14745600)
+
+
 Name:   sc16is752-spi1
 Info:   Overlay for the NXP SC16IS752 Dual UART with SPI Interface
         Enables the chip on SPI1.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/sc16is752-i2c-overlay.dts
@@ -0,0 +1,40 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&i2c1>;
+
+		frag1: __overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			sc16is752: sc16is752@48 {
+				compatible = "nxp,sc16is752";
+				reg = <0x48>; // i2c address
+				clocks = <&sc16is752_clk>;
+				interrupt-parent = <&gpio>;
+				interrupts = <24 0x2>; /* IRQ_TYPE_EDGE_FALLING */
+				gpio-controller;
+				#gpio-cells = <0>;
+				i2c-max-frequency = <400000>;
+				status = "okay";
+
+				sc16is752_clk: sc16is752_clk {
+					compatible = "fixed-clock";
+					#clock-cells = <0>;
+					clock-frequency = <14745600>;
+				};
+			};
+		};
+	};
+
+	__overrides__ {
+		int_pin = <&sc16is752>,"interrupts:0";
+		addr = <&sc16is752>,"reg:0";
+		xtal = <&sc16is752>,"clock-frequency:0";
+	};
+};