1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/mfd/st,stm32-lptimer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: STMicroelectronics STM32 Low-Power Timers
8
9 description: |
10 The STM32 Low-Power Timer (LPTIM) is a 16-bit timer that provides several
11 functions
12 - PWM output (with programmable prescaler, configurable polarity)
13 - Trigger source for STM32 ADC/DAC (LPTIM_OUT)
14 - Several counter modes:
15 - quadrature encoder to detect angular position and direction of rotary
16 elements, from IN1 and IN2 input signals.
17 - simple counter from IN1 input signal.
18
19 maintainers:
20 - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
21
22 properties:
23 compatible:
24 const: st,stm32-lptimer
25
26 reg:
27 maxItems: 1
28
29 clocks:
30 maxItems: 1
31
32 clock-names:
33 items:
34 - const: mux
35
36 interrupts:
37 maxItems: 1
38
39 "#address-cells":
40 const: 1
41
42 "#size-cells":
43 const: 0
44
45 wakeup-source: true
46
47 access-controllers:
48 minItems: 1
49 maxItems: 2
50
51 pwm:
52 type: object
53 additionalProperties: false
54
55 properties:
56 compatible:
57 const: st,stm32-pwm-lp
58
59 "#pwm-cells":
60 const: 3
61
62 required:
63 - "#pwm-cells"
64 - compatible
65
66 counter:
67 type: object
68 additionalProperties: false
69
70 properties:
71 compatible:
72 const: st,stm32-lptimer-counter
73
74 required:
75 - compatible
76
77 timer:
78 type: object
79 additionalProperties: false
80
81 properties:
82 compatible:
83 const: st,stm32-lptimer-timer
84
85 required:
86 - compatible
87
88 patternProperties:
89 "^trigger@[0-9]+$":
90 type: object
91 additionalProperties: false
92
93 properties:
94 compatible:
95 const: st,stm32-lptimer-trigger
96
97 reg:
98 description: Identify trigger hardware block.
99 items:
100 minimum: 0
101 maximum: 2
102
103 required:
104 - compatible
105 - reg
106
107 required:
108 - "#address-cells"
109 - "#size-cells"
110 - compatible
111 - reg
112 - clocks
113 - clock-names
114
115 additionalProperties: false
116
117 examples:
118 - |
119 #include <dt-bindings/clock/stm32mp1-clks.h>
120 #include <dt-bindings/interrupt-controller/arm-gic.h>
121 timer@40002400 {
122 compatible = "st,stm32-lptimer";
123 reg = <0x40002400 0x400>;
124 clocks = <&timer_clk>;
125 clock-names = "mux";
126 interrupts-extended = <&exti 47 IRQ_TYPE_LEVEL_HIGH>;
127 #address-cells = <1>;
128 #size-cells = <0>;
129
130 pwm {
131 compatible = "st,stm32-pwm-lp";
132 #pwm-cells = <3>;
133 };
134
135 trigger@0 {
136 compatible = "st,stm32-lptimer-trigger";
137 reg = <0>;
138 };
139
140 counter {
141 compatible = "st,stm32-lptimer-counter";
142 };
143
144 timer {
145 compatible = "st,stm32-lptimer-timer";
146 };
147 };
148
149 ...
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