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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 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 <dave.stevenson@raspberrypi.com>
1 parent 7e692aa commit 0a4fd47

16 files changed

Lines changed: 201 additions & 7 deletions

‎arch/arm/boot/dts/overlays/README‎

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Original file line numberDiff line numberDiff line change
@@ -555,6 +555,7 @@ Params: addr I2C bus address of device. Set based on how the
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
558+
i2c-path Override I2C path to allow for i2c-gpio buses
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Channel parameters can be set for each enabled channel.
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A maximum of 4 channels can be enabled (letters a thru d).
@@ -1253,6 +1254,7 @@ Params: sizex Touchscreen size x (default 800)
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addr Sets the address for the touch controller. Note
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that the device must be configured to use the
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specified address.
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i2c-path Override I2C path to allow for i2c-gpio buses
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12571259

12581260
Name: enc28j60
@@ -1454,6 +1456,7 @@ Info: Enables I2C connected Goodix gt9271 multiple touch controller using
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Load: dtoverlay=goodix,<param>=<val>
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Params: interrupt GPIO used for interrupt (default 4)
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reset GPIO used for reset (default 17)
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i2c-path Override I2C path to allow for i2c-gpio buses
14571460

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14591462
Name: googlevoicehat-soundcard
@@ -1745,6 +1748,7 @@ Params: addr I2C address of PCF8574
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display_height Height of the display in characters (default 2)
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display_width Width of the display in characters (default 16)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: hd44780-lcd
@@ -2110,6 +2114,8 @@ Params: addr Sets the address for the fan controller. Note
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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minpwm PWM setting for the fan when the SoC is below
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mintemp (range 0-255. default 0)
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maxpwm PWM setting for the fan when the SoC is above
@@ -2180,6 +2186,8 @@ Params: pca9542 Select the NXP PCA9542 device
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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disconnect_on_idle Force the mux to disconnect all child buses
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after every transaction.
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@@ -2201,6 +2209,7 @@ Params: addr I2C address of PCA9685A (default 0x40)
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: i2c-rtc
@@ -2270,6 +2279,8 @@ Params: abx80x Select one of the ABx80x family:
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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addr Sets the address for the RTC. Note that the
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device must be configured to use the specified
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address.
@@ -2551,6 +2562,8 @@ Params: addr Set the address for the ADT7410, AS73211,
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: i2c0
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Info: Change i2c0 pin usage. Not all pin combinations are usable on all
@@ -2693,6 +2706,7 @@ Params: interrupt GPIO used for interrupt (default 4)
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touchscreen (in pixels)
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sizey Touchscreen size y, vertical resolution of
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touchscreen (in pixels)
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i2c-path Override I2C path to allow for i2c-gpio buses
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26982712
Name: imx219
@@ -3170,6 +3184,7 @@ Params: gpiopin Gpio pin connected to the INTA output of the
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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31753190
Name: mcp23s17
@@ -3619,6 +3634,17 @@ Params: addr I2C address of expander. Default 0x20.
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cat9554 Select the Onnn CAT9554 (8 bit)
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pca9654 Select the Onnn PCA9654 (8 bit)
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xra1202 Select the Exar XRA1202 (8 bit)
3637+
i2c0 Choose the I2C0 bus on GPIOs 0&1
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i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
3639+
i2c3 Choose the I2C3 bus (configure with the i2c3
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overlay - BCM2711 only)
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i2c4 Choose the I2C3 bus (configure with the i2c3
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overlay - BCM2711 only)
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i2c5 Choose the I2C5 bus (configure with the i2c4
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: pcf857x
@@ -3630,6 +3656,17 @@ Params: addr I2C address of expander. Default
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pcf8574a Select the NXP PCF8574A (8 bit)
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pcf8575 Select the NXP PCF8575 (16 bit)
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pca8574 Select the NXP PCA8574 (8 bit)
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i2c0 Choose the I2C0 bus on GPIOs 0&1
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i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
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i2c3 Choose the I2C3 bus (configure with the i2c3
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overlay - BCM2711 only)
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i2c4 Choose the I2C3 bus (configure with the i2c3
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overlay - BCM2711 only)
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i2c5 Choose the I2C5 bus (configure with the i2c4
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: pcie-32bit-dma
@@ -4291,6 +4328,17 @@ Load: dtoverlay=sc16is750-i2c,<param>=<val>
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Params: int_pin GPIO used for IRQ (default 24)
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addr Address (default 0x48)
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xtal On-board crystal frequency (default 14745600)
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i2c0 Choose the I2C0 bus on GPIOs 0&1
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i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
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i2c3 Choose the I2C3 bus (configure with the i2c3
4334+
overlay - BCM2711 only)
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i2c4 Choose the I2C4 bus (configure with the i2c4
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overlay - BCM2711 only)
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i2c5 Choose the I2C5 bus (configure with the i2c5
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
4340+
overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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42964344
Name: sc16is750-spi0
@@ -4309,6 +4357,17 @@ Load: dtoverlay=sc16is752-i2c,<param>=<val>
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Params: int_pin GPIO used for IRQ (default 24)
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addr Address (default 0x48)
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xtal On-board crystal frequency (default 14745600)
4360+
i2c0 Choose the I2C0 bus on GPIOs 0&1
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i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
4362+
i2c3 Choose the I2C3 bus (configure with the i2c3
4363+
overlay - BCM2711 only)
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i2c4 Choose the I2C4 bus (configure with the i2c4
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overlay - BCM2711 only)
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i2c5 Choose the I2C5 bus (configure with the i2c5
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overlay - BCM2711 only)
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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i2c-path Override I2C path to allow for i2c-gpio buses
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Name: sc16is752-spi0

‎arch/arm/boot/dts/overlays/ads1115-overlay.dts‎

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@@ -131,5 +131,7 @@
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<&frag100>, "target-path=i2c5";
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i2c6 = <&frag100>, "target?=0",
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<&frag100>, "target-path=i2c6";
134+
i2c-path = <&frag100>, "target?=0",
135+
<&frag100>, "target-path";
134136
};
135137
};

‎arch/arm/boot/dts/overlays/edt-ft5406-overlay.dts‎

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Original file line numberDiff line numberDiff line change
@@ -41,6 +41,9 @@
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i2c6 = <&ts_i2c_frag>, "target?=0",
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<&ts_i2c_frag>, "target-path=i2c6",
4343
<0>,"-0-1";
44+
i2c-path = <&ts_i2c_frag>, "target?=0",
45+
<&ts_i2c_frag>, "target-path",
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<0>,"-0-1";
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addr = <&ft5406>,"reg:0";
4548
};
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};

‎arch/arm/boot/dts/overlays/goodix-overlay.dts‎

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Original file line numberDiff line numberDiff line change
@@ -16,7 +16,7 @@
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};
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};
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19-
fragment@1 {
19+
i2c_frag: fragment@1 {
2020
target = <&i2c1>;
2121
__overlay__ {
2222
#address-cells = <1>;
@@ -42,5 +42,7 @@
4242
<&gt9271>,"irq-gpios:4";
4343
reset = <&goodix_pins>,"brcm,pins:4",
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<&gt9271>,"reset-gpios:4";
45+
i2c-path = <&i2c_frag>, "target?=0",
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<&i2c_frag>, "target-path";
4547
};
4648
};

‎arch/arm/boot/dts/overlays/hd44780-i2c-lcd-overlay.dts‎

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Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
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/ {
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compatible = "brcm,bcm2835";
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7-
fragment@0 {
7+
i2c_frag: fragment@0 {
88
target = <&i2c_arm>;
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__overlay__ {
1010
status = "okay";
@@ -52,6 +52,8 @@
5252
display_height = <&lcd_screen>,"display-height-chars:0";
5353
display_width = <&lcd_screen>,"display-width-chars:0";
5454
addr = <&pcf857x>,"reg:0";
55+
i2c-path = <&i2c_frag>, "target?=0",
56+
<&i2c_frag>, "target-path";
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};
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};

‎arch/arm/boot/dts/overlays/i2c-fan-overlay.dts‎

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@@ -93,6 +93,8 @@
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<&frag100>, "target-path=i2c5";
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i2c6 = <&frag100>, "target?=0",
9595
<&frag100>, "target-path=i2c6";
96+
i2c-path = <&frag100>, "target?=0",
97+
<&frag100>, "target-path";
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addr = <&emc2301>,"reg:0";
9799
minpwm = <&emc2301>,"emc2305,pwm-min.0";
98100
maxpwm = <&emc2301>,"emc2305,pwm-max.0";

‎arch/arm/boot/dts/overlays/i2c-mux-overlay.dts‎

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@@ -175,6 +175,8 @@
175175
<&frag100>, "target-path=i2c5";
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i2c6 = <&frag100>, "target?=0",
177177
<&frag100>, "target-path=i2c6";
178+
i2c-path = <&frag100>, "target?=0",
179+
<&frag100>, "target-path";
178180
disconnect_on_idle =
179181
<&pca9542>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,
180182
<&pca9545>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,

‎arch/arm/boot/dts/overlays/i2c-pwm-pca9685a-overlay.dts‎

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Original file line numberDiff line numberDiff line change
@@ -57,5 +57,7 @@
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<&frag100>, "target-path=i2c5";
5858
i2c6 = <&frag100>, "target?=0",
5959
<&frag100>, "target-path=i2c6";
60+
i2c-path = <&frag100>, "target?=0",
61+
<&frag100>, "target-path";
6062
};
6163
};

‎arch/arm/boot/dts/overlays/i2c-rtc-overlay.dts‎

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@@ -38,5 +38,7 @@
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<&frag100>, "target-path=i2c5";
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i2c6 = <&frag100>, "target?=0",
4040
<&frag100>, "target-path=i2c6";
41+
i2c-path = <&frag100>, "target?=0",
42+
<&frag100>, "target-path";
4143
};
4244
};

‎arch/arm/boot/dts/overlays/i2c-sensor-overlay.dts‎

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Original file line numberDiff line numberDiff line change
@@ -38,5 +38,7 @@
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<&frag100>, "target-path=i2c5";
3939
i2c6 = <&frag100>, "target?=0",
4040
<&frag100>, "target-path=i2c6";
41+
i2c-path = <&frag100>, "target?=0",
42+
<&frag100>, "target-path";
4143
};
4244
};

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