MCP23017: allow the specification of the i2c bus

Analogous to i2c-rtc-overlay.dts
raspberrypi · Oct 15, 2023 · 938957b · 938957b
1 parent 392b984
commit 938957b
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Showing 2 changed files with 16 additions and 2 deletions.
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
@@ -2811,6 +2811,10 @@ Params: gpiopin                 Gpio pin connected to the INTA output of the
         mcp23008                Configure an MCP23008 instead.
         noints                  Disable the interrupt GPIO line.
 
+        i2c0                    Choose the I2C0 bus on GPIOs 0&1
+
+        i2c_csi_dsi             Choose the I2C0 bus on GPIOs 44&45
+
 
 Name:   mcp23s17
 Info:   Configures the MCP23S08/17 SPI GPIO expanders.

diff --git a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
@@ -7,7 +7,7 @@
 	compatible = "brcm,bcm2835";
 
 	fragment@0 {
-		target = <&i2c1>;
+		target = <&i2cbus>;
 		__overlay__ {
 			status = "okay";
 		};
@@ -24,7 +24,7 @@
 	};
 
 	fragment@2 {
-		target = <&i2c1>;
+		target = <&i2cbus>;
 		__overlay__ {
 			#address-cells = <1>;
 			#size-cells = <0>;
@@ -58,12 +58,22 @@
 		};
 	};
 
+	frag100: fragment@100 {
+		target = <&i2c_arm>;
+		i2cbus: __overlay__ {
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
 		gpiopin = <&mcp23017_pins>,"brcm,pins:0",
 				<&mcp23017_irq>,"interrupts:0";
 		addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
 		mcp23008 = <0>,"=3";
 		noints = <0>,"!1!4";
+		i2c0 = <&frag100>, "target:0=",<&i2c0>;
+		i2c_csi_dsi = <&frag100>, "target:0=",<&i2c_csi_dsi>;
 	};
 };
 
+