Supporting Allwinner ARM SoCs in Fedora 21+ kernels

[Hans de Goede]

Hi All,

As you probably know in my spare time I'm working on Linux Allwinner SoC support.

We (the linux-sunxi community) are currently making good progress on getting
Allwinner SoCs supported in the upstream kernel. It looks like the majority
of it will land in 3.14 and 3.15. As such I believe the time has come to
start supporting Allwinner SoCs with the official Fedora kernels ootb for
F-21.

I've written a Feature page for this, which you can find here:
https://fedoraproject.org/wiki/Changes/AllwinnerSunxiSupport

This will likely require carrying some kernel patches for 1-2 kernel releases,
until all the necessary bits for headless operation have landed upstream.

As always I'm willing to put my time were my work is, and I'll maintain these
patches for as long as necessary. To give you an idea of where things are
going, here is a break down of the tree I'm currently using for testing
and development, see:
https://github.com/linux-sunxi/linux-sunxi/commits/sunxi-devel

This branch contains 3.13-rc5

+ the following, which should all go upstream for 3.14:

  https://github.com/mripard/linux/commits/sunxi-clk-for-3.13
  https://github.com/mripard/linux/commits/sunxi-drivers-for-3.14
  https://github.com/mripard/linux/commits/sunxi-core-for-3.14
  https://github.com/mripard/linux/commits/sunxi-dt-for-3.14
  sunxi-bits of:
   https://git.linaro.org/people/daniel.lezcano/linux.git/shortlog/refs/heads/clockevents/next
  Emilio's "[PATCH v3 00/13] clk: sunxi: add PLL5 and PLL6 support" series

+ the following which is not quite ready for 3.14 yet, but people
are working hard to get it ready so hopefully we will see some of
it in 3.14, and the rest should make 3.15:

  Emilio's sunxi-clk branch: patches not part of the above set
  David's and mine sunxi-mmc work
  Chen's gmac work
  Oliver's ahci work
  Arokux' ehci work
  mripard's "ARM: sunxi: Add A31 High Speed Timer Support" series
  wens' "v2 of A20 external output clock support patch series"
  hansg's resistive touchscreen controller driver (rtp) including temp sensor support

Of the above list, we should at a minimum carry the mmc, gmac (gigabit nic) and
ahci patches if those don't get upstream in time. USB support would also be very nice,
but is not a must have. The last 3 patch-sets we don't need.

Regards,

Hans