1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/clock/pwm-c 4 $id: http://devicetree.org/schemas/clock/pwm-clock.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: An external clock signal driven by a PW 7 title: An external clock signal driven by a PWM pin.
8 8
9 maintainers: 9 maintainers:
10 - Philipp Zabel <p.zabel@pengutronix.de> 10 - Philipp Zabel <p.zabel@pengutronix.de>
11 11
12 properties: 12 properties:
13 compatible: 13 compatible:
14 const: pwm-clock 14 const: pwm-clock
15 15
16 '#clock-cells': 16 '#clock-cells':
17 const: 0 17 const: 0
18 18
19 clock-frequency: 19 clock-frequency:
20 description: Exact output frequency, in ca 20 description: Exact output frequency, in case the PWM period is not exact
21 but was rounded to nanoseconds. 21 but was rounded to nanoseconds.
22 22
23 clock-output-names: 23 clock-output-names:
24 maxItems: 1 24 maxItems: 1
25 25
26 pwms: 26 pwms:
27 maxItems: 1 27 maxItems: 1
28 28
29 required: 29 required:
30 - compatible 30 - compatible
31 - '#clock-cells' 31 - '#clock-cells'
32 - pwms 32 - pwms
33 33
34 additionalProperties: false 34 additionalProperties: false
35 35
36 examples: 36 examples:
37 - | 37 - |
38 clock { 38 clock {
39 compatible = "pwm-clock"; 39 compatible = "pwm-clock";
40 #clock-cells = <0>; 40 #clock-cells = <0>;
41 clock-frequency = <25000000>; 41 clock-frequency = <25000000>;
42 clock-output-names = "mipi_mclk"; 42 clock-output-names = "mipi_mclk";
43 pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 43 pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 MHz */
44 }; 44 };
45 ... 45 ...
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