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MCP23017: allow specification of the i2c bus #5650

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Oct 15, 2023
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MCP23017: allow specification of the i2c bus #5650

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10 changes: 10 additions & 0 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -2810,6 +2810,16 @@ 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
i2c3 Choose the I2C3 bus (configure with the i2c3
overlay - BCM2711 only)
i2c4 Choose the I2C4 bus (configure with the i2c4
overlay - BCM2711 only)
i2c5 Choose the I2C5 bus (configure with the i2c5
overlay - BCM2711 only)
i2c6 Choose the I2C6 bus (configure with the i2c6
overlay - BCM2711 only)


Name: mcp23s17
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36 changes: 34 additions & 2 deletions arch/arm/boot/dts/overlays/mcp23017-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
compatible = "brcm,bcm2835";

fragment@0 {
target = <&i2c1>;
target = <&i2cbus>;
__overlay__ {
status = "okay";
};
Expand All @@ -24,7 +24,7 @@
};

fragment@2 {
target = <&i2c1>;
target = <&i2cbus>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
Expand Down Expand Up @@ -58,12 +58,44 @@
};
};

frag100: fragment@100 {
target = <&i2c1>;
i2cbus: __overlay__ {
status = "okay";
};
};

fragment@101 {

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ERROR: trailing whitespace
target = <&i2c0if>;

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__dormant__ {

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status = "okay";

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};

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};

fragment@102 {

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target = <&i2c0mux>;

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__dormant__ {

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status = "okay";

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};

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};

__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>,
<0>,"+101+102";
i2c3 = <&frag100>, "target?=0",
<&frag100>, "target-path=i2c3";
i2c4 = <&frag100>, "target?=0",
<&frag100>, "target-path=i2c4";
i2c5 = <&frag100>, "target?=0",
<&frag100>, "target-path=i2c5";
i2c6 = <&frag100>, "target?=0",
<&frag100>, "target-path=i2c6";
};
};