linux-kernel - Re: [PATCH v2 2/3] ARM: dts: add Netronix E60K02 board common file

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Date:   Mon, 7 Oct 2019 00:38:48 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, manivannan.sadhasivam@...aro.org,
        andrew.smirnov@...il.com, marex@...x.de, angus@...ea.ca,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, j.neuschaefer@....net,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Marco Felsch <m.felsch@...gutronix.de>
Subject: Re: [PATCH v2 2/3] ARM: dts: add Netronix E60K02 board common file

Thanks for CCing me on this patchset. Nice to see more e-book reader
related work!

A few comments and questions below.

On Mon, Sep 30, 2019 at 09:43:31PM +0200, Andreas Kemnade wrote:
> The Netronix board E60K02 can be found some several Ebook-Readers,
> at least the Kobo Clara HD and the Tolino Shine 3. The board
> is equipped with different SoCs requiring different pinmuxes.

Do I understand it correctly that i.MX6SL and i.MX6SLL are pin-
compatible so we can use the same pin numbers and GPIO handles in the
DT?

> +	leds {
> +		compatible = "gpio-leds";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_led>;
> +
> +		GLED {

What does "GLED" mean? It's not obvious to me.
What user-visible purpose does this LED have, or where is it on the
board?

> +			gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;
> +			linux,default-trigger = "timer";
> +		};
> +	};
> +
> +	memory {
> +		reg = <0x80000000 0x80000000>;

2 GiB of memory?

> +			/* Core3_3V3 */

What are these labels (Core3_3V3, Core4_1V2, etc.)?

> +			dcdc2_reg: DCDC2 {
> +				regulator-name = "DCDC2";
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-state-mem {
> +					regulator-on-in-suspend;
> +					regulator-suspend-max-microvolt = <3300000>;
> +					regulator-suspend-min-microvolt = <3300000>;
> +				};
> +			};


Thanks,
Jonathan Neuschäfer

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