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Date:   Wed, 31 Aug 2022 16:28:09 +0200
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     Andrew Lunn <andrew@lunn.ch>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Marek Behun <marek.behun@nic.cz>
Cc:     linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: turris-omnia: Add mcu node
Message-ID: <20220831142809.lcmnv3l4rnulo522@pali>
References: <20220819131152.6513-1-pali@kernel.org>
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On Friday 19 August 2022 15:11:52 Pali Rohár wrote:
> At i2c address 0x2a is MCU command interface which provides access to GPIOs
> connected to Turris Omnia MCU. So define mcu node in Turris Omnia DTS file.
> 
> Signed-off-by: Pali Rohár <pali@kernel.org>
> 
> ---
> Same change was already sent to U-Boot project together with driver. As
> Turris Omnia DTS file is shared between Linux kernel U-Boot, I'm sending
> this change also in Linux. There is a plan to write also Linux driver for
> Turris Omnia MCU, like there is already in U-Boot.
> 
> https://source.denx.de/u-boot/u-boot/-/commit/832738974806e6264a3d0ac2aaa92d0f662fd128
> https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/gpio/turris_omnia_mcu.c
> ---
>  arch/arm/boot/dts/armada-385-turris-omnia.dts | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/armada-385-turris-omnia.dts b/arch/arm/boot/dts/armada-385-turris-omnia.dts
> index f4878df39753..f655e9229d68 100644
> --- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
> +++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
> @@ -184,7 +184,13 @@
>  			#size-cells = <0>;
>  			reg = <0>;
>  
> -			/* STM32F0 command interface at address 0x2a */
> +			/* MCU command i2c API */
> +			mcu: mcu@2a {
> +				compatible = "cznic,turris-omnia-mcu";
> +				reg = <0x2a>;
> +				gpio-controller;
> +				#gpio-cells = <3>;
> +			};
>  
>  			led-controller@2b {
>  				compatible = "cznic,turris-omnia-leds";
> -- 
> 2.20.1
>