openwrt/target/linux/bcm27xx/patches-5.4/950-0355-overlays-Make-mcp342x-run-time-compatible.patch

From 00f01136b1c165e0f4a190fcb5ec8aa11428362f Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 9 Dec 2019 12:32:20 +0000
Subject: [PATCH] overlays: Make mcp342x run-time compatible

The order of processing of run-time overlays differs from that done by
the firmware. This means that certain parameter processing techniques
are not compatible with run-time use.  The mcp342x overlay is one such
overlay, but it is easy to change the implementation without changing
the interface.

See: https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=258294

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 .../arm/boot/dts/overlays/mcp342x-overlay.dts | 133 ++++++++++++++----
 1 file changed, 102 insertions(+), 31 deletions(-)

--- a/arch/arm/boot/dts/overlays/mcp342x-overlay.dts
+++ b/arch/arm/boot/dts/overlays/mcp342x-overlay.dts
@@ -8,14 +8,15 @@
 
 	fragment@0 {
 		target = <&i2c1>;
-		__overlay__ {
+		__dormant__ {
 			#address-cells = <1>;
 			#size-cells = <0>;
 
 			status = "okay";
 
-			mcp342x: mcp@68 {
+			mcp3421: mcp@68 {
 				reg = <0x68>;
+				compatible = "microchip,mcp3421";
 
 				status = "okay";
 			};
@@ -23,71 +24,141 @@
 	};
 
 	fragment@1 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3421";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3422: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3422";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@2 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3422";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3423: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3423";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@3 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3423";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3424: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3424";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@4 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3424";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3425: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3425","mcp3425";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@5 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3425";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3426: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3426";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@6 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3426";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			mcp3427: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3427";
+
+				status = "okay";
+			};
 		};
 	};
 
 	fragment@7 {
-		target = <&mcp342x>;
+		target = <&i2c1>;
 		__dormant__ {
-			compatible = "microchip,mcp3427";
-		};
-	};
+			#address-cells = <1>;
+			#size-cells = <0>;
 
-	fragment@8 {
-		target = <&mcp342x>;
-		__dormant__ {
-			compatible = "microchip,mcp3428";
+			status = "okay";
+
+			mcp3428: mcp@68 {
+				reg = <0x68>;
+				compatible = "microchip,mcp3428";
+
+				status = "okay";
+			};
 		};
 	};
 
 	__overrides__ {
-		addr = <&mcp342x>,"reg:0";
-		mcp3421 = <0>,"=1";
-		mcp3422 = <0>,"=2";
-		mcp3423 = <0>,"=3";
-		mcp3424 = <0>,"=4";
-		mcp3425 = <0>,"=5";
-		mcp3426 = <0>,"=6";
-		mcp3427 = <0>,"=7";
-		mcp3428 = <0>,"=8";
+		addr = <&mcp3421>,"reg:0",
+		       <&mcp3422>,"reg:0",
+		       <&mcp3423>,"reg:0",
+		       <&mcp3424>,"reg:0",
+		       <&mcp3425>,"reg:0",
+		       <&mcp3426>,"reg:0",
+		       <&mcp3427>,"reg:0",
+		       <&mcp3428>,"reg:0";
+		mcp3421 = <0>,"=0";
+		mcp3422 = <0>,"=1";
+		mcp3423 = <0>,"=2";
+		mcp3424 = <0>,"=3";
+		mcp3425 = <0>,"=4";
+		mcp3426 = <0>,"=5";
+		mcp3427 = <0>,"=6";
+		mcp3428 = <0>,"=7";
 	};
 };