linux-kernel - [PATCH 2/2] ARM: dts: stm32: add mcp23017 IO expander on I2C1 on stm32mp135f-dk

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Date:   Mon, 24 Oct 2022 11:46:48 +0200
From:   Amelie Delaunay <amelie.delaunay@...s.st.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     Amelie Delaunay <amelie.delaunay@...s.st.com>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] 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@...s.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