On Thu, Aug 26, 2021 at 05:18:28PM -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 v6: > - Fix incorrect schema id > - Enumerate possible counter widths > > Changes in v5: > - Update commit message to reflect revisions > - Fix indentation lint > - Add example for timer binding > - Remove xlnx,axi-timer-2.0 compatible string > - Move schema into the timer directory > > Changes in v4: > - Remove references to generate polarity so this can get merged > - Predicate PWM driver on the presence of #pwm-cells > - Make some properties optional for clocksource drivers > > Changes in v3: > - Mark all boolean-as-int properties as deprecated > - Add xlnx,pwm and xlnx,gen?-active-low properties. > - Make newer replacement properties mutually-exclusive with what they > replace > - Add an example with non-deprecated properties only. > > Changes in v2: > - Use 32-bit addresses for example binding > > .../bindings/timer/xlnx,xps-timer.yaml | 90 +++++++++++++++++++ > 1 file changed, 90 insertions(+) > create mode 100644 Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml > > diff --git a/Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml b/Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml > new file mode 100644 > index 000000000000..5be353a642aa > --- /dev/null > +++ b/Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml > @@ -0,0 +1,90 @@ > +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/timer/xlnx,xps-timer.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Xilinx LogiCORE IP AXI Timer Device Tree Binding > + > +maintainers: > + - Sean Anderson <sean.anderson@xxxxxxxx> > + > +properties: > + compatible: > + contains: > + const: xlnx,xps-timer-1.00.a > + > + clocks: > + maxItems: 1 > + > + clock-names: > + const: s_axi_aclk > + > + interrupts: > + maxItems: 1 > + > + reg: > + maxItems: 1 > + > + xlnx,count-width: > + $ref: /schemas/types.yaml#/definitions/uint32 > + enum: [8, 16, 32] > + default: 32 > + description: > + The width of the counter(s), in bits. > + > + xlnx,one-timer-only: > + $ref: /schemas/types.yaml#/definitions/uint32 > + enum: [ 0, 1 ] > + description: > + Whether only one timer is present in this block. > + > +required: > + - compatible > + - reg > + - xlnx,one-timer-only > + > +allOf: > + - if: > + required: > + - '#pwm-cells' > + then: > + allOf: > + - required: > + - clocks > + - properties: > + xlnx,one-timer-only: > + const: 0 > + else: > + required: > + - interrupts > + - if: > + required: > + - clocks > + then: > + required: > + - clock-names > + > +additionalProperties: true This needs to be false. What else do you expect to be present? > + > +examples: > + - | > + timer@800e0000 { > + clock-names = "s_axi_aclk"; > + clocks = <&zynqmp_clk 71>; > + compatible = "xlnx,xps-timer-1.00.a"; > + reg = <0x800e0000 0x10000>; > + interrupts = <0 39 2>; > + xlnx,count-width = <16>; > + xlnx,one-timer-only = <0x0>; > + }; > + > + timer@800f0000 { > + #pwm-cells = <0>; > + clock-names = "s_axi_aclk"; > + clocks = <&zynqmp_clk 71>; > + compatible = "xlnx,xps-timer-1.00.a"; > + reg = <0x800e0000 0x10000>; > + xlnx,count-width = <32>; > + xlnx,one-timer-only = <0x0>; > + }; > -- > 2.25.1 > >
