[linux-sunxi] Re: [RFC PATCH] ARM: dts: sun8i: add simplefb node for H3

[Icenowy Zheng]

01.12.2016, 04:52, "Maxime Ripard" <maxime.ripard at free-electrons.com>:
> On Wed, Nov 30, 2016 at 09:41:26PM +0100, Jernej Škrabec wrote:
>>  > > > > The only
>>  > > > > code left from you is for DE2. HDMI stuff is basically copied from
>>  > > > > Rockhip
>>  > > > > driver (including EDID reading), TCON code is now reverted to the same
>>  > > > > as
>>  > > > > it is in sunxi_display.c. I think it is worth to take a look at EDID
>>  > > > > code
>>  > > > > and compare it.
>>  > > >
>>  > > > So is the TCON of DE 2.0 identical to the original TCON?
>>  > > >
>>  > > > If so, we should reuse sun4i-tcon ...
>>  > >
>>  > > Well, TCON is splitted in two parts (two base addresses), one for HDMI and
>>  > > one for TV. However, register offsets are same as before, so I guess
>>  > > driver reusage make sense. I think that there are few additional
>>  > > registers, but they can be ignored for simplefb.
>>  >
>>  > The TCON1 of the H3 is not usable (no ckock). Analog TV has its own
>>  > clock and I/O area.
>>  >
>>
>>  True, H3 user manual can be misleading sometimes. But this doesn't change the
>>  fact that TCON0 has same register offsets with same meaning.
>
> Then yes, we should definitely share the drivers too. So, in the end,
> the only thing that is actually new is the display-engine?

And HDMI PHY on H3 ;-)

In my opinion, we should just put sun8i-de2-drm related code into drivers/gpu/drm/sun4i/ .
(Or rename the directory to sunxi)

>
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com