On Fri, 15 Oct 2021 15:00:24 -0400, Sean Anderson wrote: > This adds a binding for the Xilinx LogiCORE IP AXI Timer. This device is a > "soft" block, so it has some parameters which would not be configurable in > most hardware. This binding is usually automatically generated by Xilinx's > tools, so the names and values of some properties should be kept as they > are, if possible. In addition, this binding is already in the kernel at > arch/microblaze/boot/dts/system.dts, and in user software such as QEMU. > > The existing driver uses the clock-frequency property, or alternatively the > /cpus/timebase-frequency property as its frequency input. Because these > properties are deprecated, they have not been included with this schema. > All new bindings should use the clocks/clock-names properties to specify > the parent clock. > > Because we need to init timer devices so early in boot, we determine if we > should use the PWM driver or the clocksource/clockevent driver by the > presence/absence, respectively, of #pwm-cells. Because both counters are > used by the PWM, there is no need for a separate property specifying which > counters are to be used for the PWM. > > Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx> > --- > > Changes in v8: > - Set additionalProperties: false > > Changes in v7: > - Add #pwm-cells to properties > - Document why additionalProperties is true > > Changes in v6: > - Enumerate possible counter widths > - Fix incorrect schema id > > Changes in v5: > - Add example for timer binding > - Fix indentation lint > - Move schema into the timer directory > - Remove xlnx,axi-timer-2.0 compatible string > - Update commit message to reflect revisions > > Changes in v4: > - Make some properties optional for clocksource drivers > - Predicate PWM driver on the presence of #pwm-cells > - Remove references to generate polarity so this can get merged > > Changes in v3: > - Add an example with non-deprecated properties only. > - Add xlnx,pwm and xlnx,gen?-active-low properties. > - Make newer replacement properties mutually-exclusive with what they > replace > - Mark all boolean-as-int properties as deprecated > > Changes in v2: > - Use 32-bit addresses for example binding > > .../bindings/timer/xlnx,xps-timer.yaml | 92 +++++++++++++++++++ > 1 file changed, 92 insertions(+) > create mode 100644 Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
