This adds a binding for the Xilinx LogiCORE IP AXI Timer. This device is a "soft" block, so it has many 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 must be kept as they are. Replacement properties have been provided for new device trees. Because we need to init timer devices so early in boot, the easiest way to configure things is to use a device tree property. For the moment this is 'xlnx,pwm', but this could be extended/renamed/etc. in the future if these is a need for a generic property. Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx> --- 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/pwm/xlnx,axi-timer.yaml | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml diff --git a/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml b/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml new file mode 100644 index 000000000000..48a280f96e63 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/xlnx,axi-timer.yaml# +$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: + oneOf: + - items: + - const: xlnx,axi-timer-2.0 + - const: xlnx,xps-timer-1.00.a + - items: + - 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 + minimum: 8 + maximum: 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 + +examples: + - | + axi_timer_0: timer@800e0000 { + #pwm-cells = <0>; + clock-names = "s_axi_aclk"; + clocks = <&zynqmp_clk 71>; + compatible = "xlnx,axi-timer-2.0", "xlnx,xps-timer-1.00.a"; + reg = <0x800e0000 0x10000>; + xlnx,count-width = <0x20>; + xlnx,one-timer-only = <0x0>; + }; -- 2.25.1
