linux-kernel - Re: [linux-sunxi] [PATCH] [V2] ARM: dts: sun7i: Add dts file for Bananapi M1 Plus board

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Date:	Mon, 13 Jun 2016 11:01:53 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Bernhard Nortmann <bernhard.nortmann@....de>,
	Julian Calaby <julian.calaby@...il.com>,
	罗翼 <luoyi.ly@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree <devicetree@...r.kernel.org>,
	"Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH] [V2] ARM: dts: sun7i: Add dts file for
 Bananapi M1 Plus board

On Fri, Jun 10, 2016 at 5:38 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> On Thu, Jun 02, 2016 at 11:15:55AM +0200, Bernhard Nortmann wrote:
>> Am 02.06.2016 um 10:16 schrieb Maxime Ripard:
>> >[...]
>> >Yes, everything that is shared with the banana-pro (which, judging
>> >from Bernhard, is pretty much everything but a GPIO) should be merged
>> >in the banapro DT.
>> >
>> >Maxime
>> >
>>
>> Don't take my word for granted, as I do not own this hardware or know it
>> particularly well. There is no doubt that "BPi-M1+" and "Banana Pro" are
>> very similar, but if in doubt the information form the wiki should be
>> verified.
>
> Hmmmm, ok. Chen-Yu, any input on this? You know the banana-pis much
> more than I do.

I did a comparison of the "Banana Pro" vs the "BPi-M1+".

The differences are similar to what we have with any other development
board, say the Cubietruck:

  - A different WiFi chip is used, and the BT part is not hooked up.
  - Different GPIOs for external power regulator/switches
  - Different GPIOs for LEDs
  - Different peripherals exposed on the headers.

IMO There's no need to merge or have a common .dtsi for the two boards.
They (and all the other development boards) look similar because
everyone is following the basic set by Allwinner's reference design,
like which MMC controller and pins are used for SD/MMC, which ones
are used for SDIO-based WiFi, and so on.

I did a version completely from scratch using just the schematics:

  https://github.com/wens/linux/commits/bpi-m1-plus

Please ignore the last commit. It's just me playing with NTP support
for GPS time.


Regards
ChenYu