linux-kernel - Re: [PATCH v4 2/2] arm64: dts: imx93-var-som: Add Variscite VAR-SOM-MX93

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Date: Fri, 29 Dec 2023 15:08:02 +0100
From: Stefan Wahren <wahrenst@....net>
To: Mathieu Othacehe <othacehe@....org>
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>,
 Li Yang <leoyang.li@....com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v4 2/2] arm64: dts: imx93-var-som: Add Variscite
 VAR-SOM-MX93

Hi Mathieu,

Am 29.12.23 um 14:00 schrieb Mathieu Othacehe:
> Hello Stefan,
>
>> there are neither gpio-line-names defined for this GPIO expander nor the
>> SOC. Are there no GPIOs which can be accessed from userspace?
> The carrier board schematic is here:
> https://www.variscite.com/wp-content/uploads/2023/01/symphony-board_VAR-SOM-MX93.pdf
Thanks this helps.
>
> All the pin headers are mapped to specific functions. On the other,
> already mainlined device-trees, that are based on the same "Symphony"
> carrier board, there are however gpio-keys for three buttons:
>
>
> 	gpio-keys {
> 		compatible = "gpio-keys";
>
> 		key-back {
> 			label = "Back";
> 			gpios = <&pca9534 1 GPIO_ACTIVE_LOW>;
> 			linux,code = <KEY_BACK>;
> 		};
>
> 		key-home {
> 			label = "Home";
> 			gpios = <&pca9534 2 GPIO_ACTIVE_LOW>;
> 			linux,code = <KEY_HOME>;
> 		};
>
> 		key-menu {
> 			label = "Menu";
> 			gpios = <&pca9534 3 GPIO_ACTIVE_LOW>;
> 			linux,code = <KEY_MENU>;
> 		};
> 	};
>
> I can add that in v5.
yes please.

I also saw in the other Symphony DTS a LED for heartbeat. Is it usable, too?

According to the datasheet the SOM expose 7 UARTs, but only the debug
UART is enable. What is the reason for this?

Btw the commit log mentions a Wifi (via SDIO?) and audio interface. This
is currently not supported by Linux?

Thanks
>
> Thanks,
>
> Mathieu