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

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Date:   Mon, 7 Oct 2019 07:48:13 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
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,
        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

Hi Jonathan,

On Mon, 7 Oct 2019 00:38:48 +0200
Jonathan Neuschäfer <j.neuschaefer@....net> wrote:

> 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?
> 
Yes, for that purpose yes, The i.MX6SL has more functions than the i.MX6SLL,
which you will of course not find on the SLL pins.

> > +	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?
> 
It is on the power key. So probably we could have "power" in its name.
GLED is just the name in vendors uboot and kernel.

I use that led also as an output in uboot to have multiboot between
vendor system, vendor kernel +debian system and patched mainline + debian system.

> > +			gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;
> > +			linux,default-trigger = "timer";
> > +		};
> > +	};
> > +
> > +	memory {
> > +		reg = <0x80000000 0x80000000>;  
> 
> 2 GiB of memory?
> 
Well, 512MByte. Seems that uboot overwrites that. But we should use the correct
value here.

> > +			/* Core3_3V3 */  
> 
> What are these labels (Core3_3V3, Core4_1V2, etc.)?
>
I have taken then from the tolino board file. Probably they are netnames
of the pcb but not the names of the regulators in the pmic.
 
> > +			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>;
> > +				};
> > +			};  
> 
Regards,
Andreas

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