Question regarding clocks in the DW-HDMI DT bindings

[Fabio Estevam]

Hi Laurent,

On Thu, Nov 24, 2016 at 9:26 PM, Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:

> Another question I have about the bus clock (CC'ing the devicetree mailing
> list as well as the clock maintainers) is whether it should be made optional.
> The clock is obviously mandatory from a hardware point of view (given that APB
> is a synchronous bus and thus requires a clock), but in some SoCs
> (specifically for the Renesas SoCs) that clock is always on and can't be
> controlled. We already omit bus clocks in DT for most IP cores when the clock
> can never be controlled (and we also omit a bunch of other clocks that we
> don't even know exist), so it could make sense to make the clock optional.
> Otherwise there would be runtime overhead trying to handle a clock that can't
> be controlled.

What if you register the clock as a "dummy" clock instead?