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 14:00:58 +0100
From: Mathieu Othacehe <othacehe@....org>
To: Stefan Wahren <wahrenst@....net>
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


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

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.

Thanks,

Mathieu