ARM: dts: stm32: add mcp23017 IO expander on I2C1 on stm32mp135f-dk

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>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index b7bf36b..9ff5a3e 100644 (file)
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -129,6 +129,20 @@
        /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;
+       };
+
        typec@53 {
                compatible = "st,stm32g0-typec";
                reg = <0x53>;