dtoverlays: Add override for target-path on I2C overlays

To allow for attaching any of the standard overlays to a bitbashed i2c-gpio bus, allow specifying the target path for the overlay. Suggested by: https://forums.raspberrypi.com/viewtopic.php?t=381059 2 overlays implemented as examples, but could be applied to all. Example: dtoverlay=i2c-gpio,i2c_gpio_sda=10,i2c_gpio_scl=11 dtoverlay=mcp23017,i2c-path=/i2c@0 dtoverlay=i2c-gpio,i2c_gpio_sda=12,i2c_gpio_scl=13,bus=3 dtoverlay=mcp23017,i2c-path=/i2c@3 Signed-off-by: Dave Stevenson <[email protected]>
6by9 · Dec 16, 2024 · cda0203 · cda0203
1 parent 77c09f1
commit cda0203
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diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
@@ -555,6 +555,7 @@ Params: addr                    I2C bus address of device. Set based on how the
                                 overlay - BCM2711 only)
         i2c6                    Choose the I2C6 bus (configure with the i2c6
                                 overlay - BCM2711 only)
+        i2c-path                Override I2C path to allow for i2c-gpio buses
 
         Channel parameters can be set for each enabled channel.
         A maximum of 4 channels can be enabled (letters a thru d).
@@ -3138,6 +3139,7 @@ Params: gpiopin                 Gpio pin connected to the INTA output of the
                                 overlay - BCM2711 only)
         i2c6                    Choose the I2C6 bus (configure with the i2c6
                                 overlay - BCM2711 only)
+        i2c-path                Override I2C path to allow for i2c-gpio buses
 
 
 Name:   mcp23s17

diff --git a/arch/arm/boot/dts/overlays/ads1115-overlay.dts b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
@@ -131,5 +131,7 @@
 		       <&frag100>, "target-path=i2c5";
 		i2c6 = <&frag100>, "target?=0",
 		       <&frag100>, "target-path=i2c6";
+		i2c-path = <&frag100>, "target?=0",
+		       <&frag100>, "target-path";
 	};
 };
diff --git a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
@@ -98,6 +98,8 @@
 		       <&frag100>, "target-path=i2c5";
 		i2c6 = <&frag100>, "target?=0",
 		       <&frag100>, "target-path=i2c6";
+		i2c-path = <&frag100>, "target?=0",
+		       <&frag100>, "target-path";
 	};
 };