[PATCH V2] ARM: dts: sun6i: Add dts file for MSI Primo81 tablet

Maxime Ripard wrote:

On Sat, Dec 27, 2014 at 09:37:20AM +0200, Siarhei Siamashka wrote:

quoted

The MSI Primo81 is an A31s based tablet, with 1G RAM, 16G NAND,
1024x768 IPS LCD display, mono speaker, 0.3 MP front camera, 2.0 MP
rear camera, 3500 mAh battery, gt911 touchscreen, mma8452 accelerometer
and rtl8188etv usb wifi. Has "power", "volume+" and "volume-" buttons
(both volume buttons are also connected to the UBOOT_SEL pin). The
external connectors are represented by MicroSD slot, MiniHDMI, MicroUSB
OTG and 3.5mm headphone jack. More details are available at
    http://linux-sunxi.org/MSI_Primo81

This initial dts file only provides support for mmc, wifi and uart
(there is no external connector for uart though). Graphics can be used
via simplefb. However, without usb otg, there are no reasonable means
to handle user input yet.

[...]

These two patches look very good overall.

There's two things about the two of them though:
  - We just switched to using the DT includes, please use them for
    your GPIO flags and pinctrl drive strength and pull
    configurations.
  - We will switch soon to using the kind of syntax used for example
    by TI in their DTSes (you can look at the beaglebone black for an
    good example.), it would be great if you could use that in your
    two DTSes, in order to avoid changing everything again in a near
    future.

As far as I can see nobody has taken this up until now, so I have
slightly reworked Siarhei's original patch:

- changed the numeric pinctrl and gpio values to their symbolic
  equivalents

- changed the include syntax from /include/ to #include to make
  the dts build with current kernels.

I have current u-boot master working on the tablet (booted from
SD card), with console on the LCD, USB-OTG-support and a USB
keyboard.  A defconfig patch for OTG+keyboard support has been
submitted to the u-boot list.

Unfortunately I have not yet had much luck with the kernel.
I try to get Hans de Goede's sunxi-wip branch
(https://github.com/jwrdegoede/linux-sunxi/tree/sunxi-wip) to
work on the Primo81, but I have not yet been able to get any
kernel output on the LCD.  Debugging this is slightly difficult
as I currently lack an SD breakout board, so I have no way to
get a serial console for now.

Siarhei, could you perhaps give Hans' sunxi-wip branch a try on
your Primo81? AFAIK you have a breakout board for it.

Regards,
Karsten
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