[linux-sunxi] Re: [PATCH v4 0/5] simplefb: add clock handling code

[Geert Uytterhoeven]

Hi Grant,

On Tue, Nov 11, 2014 at 10:49 PM, Grant Likely <grant.likely at linaro.org> wrote:
> However, I am concerned about handover. I've lost track over the entire
> thread on whether the handover mechanism has been resolved, and I would
> really like to have a proposed solution to this documented in the
> binding. The fact that there is nothing tying the simple framebuffer to
> the actual hardware backing the framebuffer is concerning. It means the
> kernel needs to guess which graphics device is associated with the
> framebuffer.

We did discuss handover in Düsseldorf, and concluded that the simplefb's
regs property can be used for this.

While on a modern system with unified memory this association cannot be
derived in a generic way, a device-specific driver for the graphics hardware
can if the regs property of the simplefb node matches the address the CRTC
engine is configured for.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds