Messages in this thread Patch in this message | | | From | Amelie Delaunay <> | Subject | [PATCH 2/2] ARM: dts: stm32: add mcp23017 IO expander on I2C1 on stm32mp135f-dk | Date | Mon, 24 Oct 2022 11:46:48 +0200 |
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MCP23017 is an IO expander offering 16 input/output port expander with interrupt output. On stm32mp135f-dk, only INTA is routed (on PG12), but MCP23017 can mirror the bank B interrupts on INTA, that's why the property microchip,irq-mirror is used.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> --- arch/arm/boot/dts/stm32mp135f-dk.dts | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts index a87ab067c955..d5fc6462ba33 100644 --- a/arch/arm/boot/dts/stm32mp135f-dk.dts +++ b/arch/arm/boot/dts/stm32mp135f-dk.dts @@ -112,6 +112,20 @@ &i2c1 { /* spare dmas for other usage */ /delete-property/dmas; /delete-property/dma-names; + + mcp23017: pinctrl@21 { + compatible = "microchip,mcp23017"; + reg = <0x21>; + gpio-controller; + #gpio-cells = <2>; + interrupts = <12 IRQ_TYPE_LEVEL_LOW>; + interrupt-parent = <&gpiog>; + pinctrl-names = "default"; + pinctrl-0 = <&mcp23017_pins_a>; + interrupt-controller; + #interrupt-cells = <2>; + microchip,irq-mirror; + }; }; &i2c5 { -- 2.25.1
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