openwrtv4/target/linux/brcm2708/patches-4.4/0341-BCM270X_DT-Add-umbrella-I2C-Mux-overlay-i2c-mux.patch

From 76abdcc15b223ab75922f38c1cab6d224510af52 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 11 May 2016 15:38:04 +0100
Subject: [PATCH] BCM270X_DT: Add umbrella I2C Mux overlay i2c-mux

This overlay supports a range of I2C multiplexers - PCA9542 (2 ports),
PCA9545 (4 ports) and PCA9548 (8 ports).

Also remove the dedicated i2c-mux-9548a overlays since it is no longer
needed.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile                |   2 +-
 arch/arm/boot/dts/overlays/README                  |  17 ++-
 arch/arm/boot/dts/overlays/i2c-mux-overlay.dts     | 138 +++++++++++++++++++++
 .../boot/dts/overlays/i2c-mux-pca9548a-overlay.dts |  67 ----------
 4 files changed, 152 insertions(+), 72 deletions(-)
 create mode 100644 arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
 delete mode 100644 arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -34,7 +34,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hy28a.dtbo
 dtbo-$(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-mux.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-pwm-pca9685a.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c1-bcm2708.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -421,10 +421,19 @@ Params: i2c_gpio_sda            GPIO use
                                 (default "2" = ~100kHz)
 
 
-Name:   i2c-mux-pca9548a
-Info:   Adds support for an NXP PCA9548A I2C multiplexer on i2c_arm
-Load:   dtoverlay=i2c-mux-pca9548a,<param>=<val>
-Params: addr                    I2C address of PCA9548A (default 0x70)
+Name:   i2c-mux
+Info:   Adds support for a number of I2C bus multiplexers on i2c_arm
+Load:   dtoverlay=i2c-mux,<param>=<val>
+Params: pca9542                 Select the NXP PCA9542 device
+
+        pca9545                 Select the NXP PCA9545 device
+
+        pca9548                 Select the NXP PCA9548 device
+
+        addr                    Change I2C address of the device (default 0x70)
+
+
+[ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
 
 
 Name:   i2c-pwm-pca9685a
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
@@ -0,0 +1,138 @@
+// Umbrella I2C Mux overlay
+
+/dts-v1/;
+/plugin/;
+
+/{
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2c_arm>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pca9542: mux@70 {
+				compatible = "nxp,pca9542";
+				reg = <0x70>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+				};
+				i2c@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&i2c_arm>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pca9545: mux@70 {
+				compatible = "nxp,pca9545";
+				reg = <0x70>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+				};
+				i2c@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+				i2c@2 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <2>;
+				};
+				i2c@3 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <3>;
+				};
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&i2c_arm>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pca9548: mux@70 {
+				compatible = "nxp,pca9548";
+				reg = <0x70>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+				};
+				i2c@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+				i2c@2 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <2>;
+				};
+				i2c@3 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <3>;
+				};
+				i2c@4 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <4>;
+				};
+				i2c@5 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <5>;
+				};
+				i2c@6 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <6>;
+				};
+				i2c@7 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <7>;
+				};
+			};
+		};
+	};
+
+	__overrides__ {
+		pca9542 = <0>, "+0";
+		pca9545 = <0>, "+1";
+		pca9548 = <0>, "+2";
+
+		addr =  <&pca9545>,"reg:0",
+			<&pca9548>,"reg:0";
+	};
+};
--- a/arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts
+++ /dev/null
@@ -1,67 +0,0 @@
-// Definitions for NXP PCA9548A I2C mux on ARM I2C bus.
-/dts-v1/;
-/plugin/;
-
-/{
-	compatible = "brcm,bcm2708";
-
-	fragment@0 {
-		target = <&i2c_arm>;
-		__overlay__ {
-			#address-cells = <1>;
-			#size-cells = <0>;
-			status = "okay";
-
-			i2cmux: mux@70 {
-				compatible = "nxp,pca9548";
-				reg = <0x70>;
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				i2c@0 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <0>;
-				};
-				i2c@1 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <1>;
-				};
-				i2c@2 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <2>;
-				};
-				i2c@3 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <3>;
-				};
-				i2c@4 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <4>;
-				};
-				i2c@5 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <5>;
-				};
-				i2c@6 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <6>;
-				};
-				i2c@7 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <7>;
-				};
-			};
-		};
-	};
-	__overrides__ {
-		addr = <&i2cmux>,"reg:0";
-	};
-};