1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright (C) STMicroelectronics 2019.
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/st,stm32-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: STM32 GPIO and Pin Mux/Config controller
maintainers:
- Alexandre TORGUE <alexandre.torgue@st.com>
description: |
STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware
controller. It controls the input/output settings on the available pins and
also provides ability to multiplex and configure the output of various
on-chip controllers onto these pads.
properties:
compatible:
enum:
- st,stm32f429-pinctrl
- st,stm32f469-pinctrl
- st,stm32f746-pinctrl
- st,stm32f769-pinctrl
- st,stm32h743-pinctrl
- st,stm32mp157-pinctrl
- st,stm32mp157-z-pinctrl
'#address-cells':
const: 1
'#size-cells':
const: 1
ranges: true
pins-are-numbered: true
hwlocks: true
st,syscfg:
allOf:
- $ref: "/schemas/types.yaml#/definitions/phandle-array"
description: Should be phandle/offset/mask
- Phandle to the syscon node which includes IRQ mux selection.
- The offset of the IRQ mux selection register.
- The field mask of IRQ mux, needed if different of 0xf.
st,package:
allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- enum: [1, 2, 4, 8]
description:
Indicates the SOC package used.
More details in include/dt-bindings/pinctrl/stm32-pinfunc.h
patternProperties:
'^gpio@[0-9a-f]*$':
type: object
properties:
gpio-controller: true
'#gpio-cells':
const: 2
reg:
maxItems: 1
clocks:
maxItems: 1
reset:
minItems: 1
maxItems: 1
gpio-ranges:
minItems: 1
maxItems: 16
ngpios:
description:
Number of available gpios in a bank.
minimum: 1
maximum: 16
st,bank-name:
allOf:
- $ref: "/schemas/types.yaml#/definitions/string"
- enum:
- GPIOA
- GPIOB
- GPIOC
- GPIOD
- GPIOE
- GPIOF
- GPIOG
- GPIOH
- GPIOI
- GPIOJ
- GPIOK
- GPIOZ
description:
Should be a name string for this bank as specified in the datasheet.
st,bank-ioport:
allOf:
- $ref: "/schemas/types.yaml#/definitions/uint32"
- minimum: 0
- maximum: 11
description:
Should correspond to the EXTI IOport selection (EXTI line used
to select GPIOs as interrupts).
required:
- gpio-controller
- '#gpio-cells'
- reg
- clocks
- st,bank-name
'-[0-9]*$':
type: object
patternProperties:
'^pins':
type: object
description: |
A pinctrl node should contain at least one subnode representing the
pinctrl group available on the machine. Each subnode will list the
pins it needs, and how they should be configured, with regard to muxer
configuration, pullups, drive, output high/low and output speed.
properties:
pinmux:
allOf:
- $ref: "/schemas/types.yaml#/definitions/uint32-array"
description: |
Integer array, represents gpio pin number and mux setting.
Supported pin number and mux varies for different SoCs, and are
defined in dt-bindings/pinctrl/<soc>-pinfunc.h directly.
These defines are calculated as: ((port * 16 + line) << 8) | function
With:
- port: The gpio port index (PA = 0, PB = 1, ..., PK = 11)
- line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15)
- function: The function number, can be:
* 0 : GPIO
* 1 : Alternate Function 0
* 2 : Alternate Function 1
* 3 : Alternate Function 2
* ...
* 16 : Alternate Function 15
* 17 : Analog
To simplify the usage, macro is available to generate "pinmux" field.
This macro is available here:
- include/dt-bindings/pinctrl/stm32-pinfunc.h
Some examples of using macro:
/* GPIO A9 set as alernate function 2 */
... {
pinmux = <STM32_PINMUX('A', 9, AF2)>;
};
/* GPIO A9 set as GPIO */
... {
pinmux = <STM32_PINMUX('A', 9, GPIO)>;
};
/* GPIO A9 set as analog */
... {
pinmux = <STM32_PINMUX('A', 9, ANALOG)>;
};
bias-disable:
type: boolean
bias-pull-down:
type: boolean
bias-pull-up:
type: boolean
drive-push-pull:
type: boolean
drive-open-drain:
type: boolean
output-low:
type: boolean
output-high:
type: boolean
slew-rate:
description: |
0: Low speed
1: Medium speed
2: Fast speed
3: High speed
allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- enum: [0, 1, 2, 3]
required:
- pinmux
required:
- compatible
- '#address-cells'
- '#size-cells'
- ranges
- pins-are-numbered
additionalProperties: false
examples:
- |
#include <dt-bindings/pinctrl/stm32-pinfunc.h>
#include <dt-bindings/mfd/stm32f4-rcc.h>
//Example 1
pinctrl@40020000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "st,stm32f429-pinctrl";
ranges = <0 0x40020000 0x3000>;
pins-are-numbered;
gpioa: gpio@0 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x0 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOA)>;
st,bank-name = "GPIOA";
};
};
//Example 2 (using gpio-ranges)
pinctrl@50020000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "st,stm32f429-pinctrl";
ranges = <0 0x50020000 0x3000>;
pins-are-numbered;
gpiob: gpio@1000 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x1000 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOB)>;
st,bank-name = "GPIOB";
gpio-ranges = <&pinctrl 0 0 16>;
};
gpioc: gpio@2000 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x2000 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOC)>;
st,bank-name = "GPIOC";
ngpios = <5>;
gpio-ranges = <&pinctrl 0 16 3>,
<&pinctrl 14 30 2>;
};
};
//Example 3 pin groups
pinctrl {
usart1_pins_a: usart1-0 {
pins1 {
pinmux = <STM32_PINMUX('A', 9, AF7)>;
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
pins2 {
pinmux = <STM32_PINMUX('A', 10, AF7)>;
bias-disable;
};
};
};
usart1 {
pinctrl-0 = <&usart1_pins_a>;
pinctrl-names = "default";
};
...
|
