Re: [PATCH v4 1/2] dt-bindings: Add GPIO-locked fixed clock

[Vyacheslav Yurkov]

On 10.08.2026 18:58, Conor Dooley wrote:
> On Mon, Aug 10, 2026 at 11:54:03AM -0500, Rob Herring wrote:
> > On Mon, Aug 10, 2026 at 11:40:00AM -0500, Rob Herring wrote:
> >
> > I missed that this is N input clocks and 1 output clock. But that leads
> > to other questions. You've implemented a clock mux then? I still don't
> > understand for what h/w that makes sense. Which input clock is selected?
> > The locked one?
>
> Yeah, I thought this was n inputs and n outputs, with each gpio
> signalling that an individual PLL had locked.


It is n input clocks and 1 output clock. It is kind of a mux, but the 
CPU doesn't control the clocks or GPIO signals. The whole idea is that 
peripherals check the output clock, when it's locked that means _all_ 
the clocks are locked and GPIOs are in expected state. That's why the 
selection operation is not really implemented.

Actually the number of input clocks don't have to correspond to the 
number of the GPIOs, because the GPIO signals indicate the locked state 
of the clocks that are not accessible to the CPU.

Slava