On Fri, Aug 30, 2024 at 04:02:08PM +0300, Claudiu wrote: > From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> > > The VBATTB controllers controls the clock for the RTC on the Renesas > RZ/G3S. The HW block diagram for the clock logic is as follows: > > +----------+ XC `\ > RTXIN --->| |----->| \ +----+ VBATTCLK > | 32K clock| | |----->|gate|-----------> > | osc | XBYP | | +----+ > RTXOUT --->| |----->| / > +----------+ ,/ > > One could connect as input to this HW block either a crystal oscillator or > an external clock device. > > After discussions w/ Stephen Boyd the clock tree associated with this > hardware block was exported in Linux as: > > input-xtal > xbyp > xc > mux > vbattclk > > where: > - input-xtal is the input clock (connected to RTXIN, RTXOUT pins) > - xc, xbyp are mux inputs > - mux is the internal mux > - vbattclk is the gate clock that feeds in the end the RTC > > to allow selecting the input of the MUX though assigned-clock DT > properties, using the already existing clock drivers and avoid adding > other DT properties. > > This allows select the input of the mux based on the type of the > connected input clock: > - if the 32768 crystal oscillator is connected as input for the VBATTB, > the input of the mux should be xc > - if an external clock device is connected as input for the VBATTB the > input of the mux should be xbyp > > Add clock IDs for the VBATTB controller. > > Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> > --- > > Changes in v3: > - none; this patch is new > > include/dt-bindings/clock/r9a08g045-vbattb.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > create mode 100644 include/dt-bindings/clock/r9a08g045-vbattb.h Squash this into the previous patch. It is part of the binding. Rob
