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

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Message-ID: <04c725a0-1382-10e7-8404-992aad007f78@foss.st.com>
Date:   Thu, 17 Nov 2022 09:39:06 +0100
From:   Alexandre TORGUE <alexandre.torgue@...s.st.com>
To:     Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: stm32: add mcp23017 IO expander on I2C1 on
 stm32mp135f-dk

Hi Amélie

On 10/24/22 11:46, Amelie Delaunay wrote:
> 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 {

Both patches applied on stm32-next.

thanks
Alex