dtoverlays: Add option for PoE HAT to use Linux I2C instead of FW.

Adds parameter "i2c" to use the PoE HAT I2C MFD driver to instantiate
the PoE HAT drivers, instead of being off the firmware.

Signed-off-by: Dave Stevenson <[email protected]>

Author: 6by9

arch/arm/boot/dts/overlays/README

@@ -2858,6 +2858,8 @@ Params: poe_fan_temp0           Temperature (in millicelcius) at which the fan
                                 speeds up (default 55000)
         poe_fan_temp3_hyst      Temperature delta (in millicelcius) at which
                                 the fan slows down (default 5000)
+        i2c                     Control the fan via Linux I2C drivers instead of
+                                the firmware.
 
 
 Name:   rpi-poe-plus
@@ -2879,6 +2881,8 @@ Params: poe_fan_temp0           Temperature (in millicelcius) at which the fan
                                 speeds up (default 55000)
         poe_fan_temp3_hyst      Temperature delta (in millicelcius) at which
                                 the fan slows down (default 5000)
+        i2c                     Control the fan via Linux I2C drivers instead of
+                                the firmware.
 
 
 Name:   rpi-proto

arch/arm/boot/dts/overlays/rpi-poe-overlay.dts

@@ -8,16 +8,6 @@
 	compatible = "brcm,bcm2835";
 
 	fragment@0 {
-		target = <&firmware>;
-		__overlay__ {
-			fwpwm: pwm {
-				compatible = "raspberrypi,firmware-poe-pwm";
-				#pwm-cells = <2>;
-			};
-		};
-	};
-
-	fragment@1 {
 		target-path = "/";
 		__overlay__ {
 			fan: pwm-fan {
@@ -29,7 +19,7 @@
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&cpu_thermal>;
 		__overlay__ {
 			trips {
@@ -75,7 +65,7 @@
 		};
 	};
 
-	fragment@3 {
+	fragment@2 {
 		target-path = "/__overrides__";
 		__overlay__ {
 			poe_fan_temp0 =		<&trip0>,"temperature:0";
@@ -89,6 +79,52 @@
 		};
 	};
 
+	fragment@3 {
+		target = <&firmware>;
+		__overlay__ {
+			fwpwm: pwm {
+				compatible = "raspberrypi,firmware-poe-pwm";
+				#pwm-cells = <2>;
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&i2c0>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			poe_mfd: poe@51 {
+				compatible = "raspberrypi,poe-core";
+				reg = <0x51>;
+				status = "okay";
+
+				poe_mfd_pwm: poe_pwm@f0 {
+					compatible = "raspberrypi,poe-pwm";
+					reg = <0xf0>;
+					status = "okay";
+					#pwm-cells = <2>;
+				};
+			};
+		};
+	};
+
+	fragment@5 {
+		target = <&i2c0if>;
+		__dormant__ {
+			status = "okay";
+		};
+	};
+
+	fragment@6 {
+		target = <&i2c0mux>;
+		__dormant__ {
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
 		poe_fan_temp0 =		<&trip0>,"temperature:0";
 		poe_fan_temp0_hyst =	<&trip0>,"hysteresis:0";
@@ -98,5 +134,7 @@
 		poe_fan_temp2_hyst =	<&trip2>,"hysteresis:0";
 		poe_fan_temp3 =		<&trip3>,"temperature:0";
 		poe_fan_temp3_hyst =	<&trip3>,"hysteresis:0";
+		i2c =			<0>, "-3+4+5+6",
+					<&fan>,"pwms:0=",<&poe_mfd_pwm>;
 	};
 };

arch/arm/boot/dts/overlays/rpi-poe-plus-overlay.dts

@@ -16,6 +16,21 @@
 			};
 		};
 	};
+	fragment@11 {
+		target = <&poe_mfd>;
+		__dormant__ {
+			rpi-poe-power-supply@f2 {
+				compatible = "raspberrypi,rpi-poe-power-supply";
+				reg = <0xf2>;
+				status = "okay";
+			};
+		};
+	};
+
+	__overrides__ {
+		i2c =	<0>, "-3+4+5+6-10+11",
+			<&fan>,"pwms:0=",<&poe_mfd_pwm>;
+	};
 };
 
 &fan {