summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt
blob: 7ed08048516a9c9815913602fdd1c252689c1315 (plain)
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
Qualcomm PMIC GPIO block

This binding describes the GPIO block(s) found in the 8xxx series of
PMIC's from Qualcomm.

- compatible:
	Usage: required
	Value type: <string>
	Definition: must be one of:
		    "qcom,pm8018-gpio"
		    "qcom,pm8038-gpio"
		    "qcom,pm8058-gpio"
		    "qcom,pm8917-gpio"
		    "qcom,pm8921-gpio"
		    "qcom,pm8941-gpio"
		    "qcom,pma8084-gpio"

- reg:
	Usage: required
	Value type: <prop-encoded-array>
	Definition: Register base of the GPIO block and length.

- interrupts:
	Usage: required
	Value type: <prop-encoded-array>
	Definition: Must contain an array of encoded interrupt specifiers for
		    each available GPIO

- gpio-controller:
	Usage: required
	Value type: <none>
	Definition: Mark the device node as a GPIO controller

- #gpio-cells:
	Usage: required
	Value type: <u32>
	Definition: Must be 2;
		    the first cell will be used to define gpio number and the
		    second denotes the flags for this gpio

Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
a general description of GPIO and interrupt bindings.

Please refer to pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the meaning of the
phrase "pin configuration node".

The pin configuration nodes act as a container for an arbitrary number of
subnodes. Each of these subnodes represents some desired configuration for a
pin or a list of pins. This configuration can include the
mux function to select on those pin(s), and various pin configuration
parameters, as listed below.


SUBNODES:

The name of each subnode is not important; all subnodes should be enumerated
and processed purely based on their content.

Each subnode only affects those parameters that are explicitly listed. In
other words, a subnode that lists a mux function but no pin configuration
parameters implies no information about any pin configuration parameters.
Similarly, a pin subnode that describes a pullup parameter implies no
information about e.g. the mux function.

The following generic properties as defined in pinctrl-bindings.txt are valid
to specify in a pin configuration subnode:

- pins:
	Usage: required
	Value type: <string-array>
	Definition: List of gpio pins affected by the properties specified in
		    this subnode.  Valid pins are:
		    gpio1-gpio6 for pm8018
		    gpio1-gpio12 for pm8038
		    gpio1-gpio40 for pm8058
		    gpio1-gpio38 for pm8917
		    gpio1-gpio44 for pm8921
		    gpio1-gpio36 for pm8941
		    gpio1-gpio22 for pma8084

- function:
	Usage: required
	Value type: <string>
	Definition: Specify the alternative function to be configured for the
		    specified pins.  Valid values are:
		    "normal",
		    "paired",
		    "func1",
		    "func2",
		    "dtest1",
		    "dtest2",
		    "dtest3",
		    "dtest4"

- bias-disable:
	Usage: optional
	Value type: <none>
	Definition: The specified pins should be configured as no pull.

- bias-pull-down:
	Usage: optional
	Value type: <none>
	Definition: The specified pins should be configured as pull down.

- bias-pull-up:
	Usage: optional
	Value type: <empty>
	Definition: The specified pins should be configured as pull up.

- qcom,pull-up-strength:
	Usage: optional
	Value type: <u32>
	Definition: Specifies the strength to use for pull up, if selected.
		    Valid values are; as defined in
		    <dt-bindings/pinctrl/qcom,pmic-gpio.h>:
		    1: 30uA                     (PMIC_GPIO_PULL_UP_30)
		    2: 1.5uA                    (PMIC_GPIO_PULL_UP_1P5)
		    3: 31.5uA                   (PMIC_GPIO_PULL_UP_31P5)
		    4: 1.5uA + 30uA boost       (PMIC_GPIO_PULL_UP_1P5_30)
		    If this property is ommited 30uA strength will be used if
		    pull up is selected

- bias-high-impedance:
	Usage: optional
	Value type: <none>
	Definition: The specified pins will put in high-Z mode and disabled.

- input-enable:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are put in input mode.

- output-high:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are configured in output mode, driven
		    high.

- output-low:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are configured in output mode, driven
		    low.

- power-source:
	Usage: optional
	Value type: <u32>
	Definition: Selects the power source for the specified pins. Valid
		    power sources are defined per chip in
		    <dt-bindings/pinctrl/qcom,pmic-gpio.h>

- qcom,drive-strength:
	Usage: optional
	Value type: <u32>
	Definition: Selects the drive strength for the specified pins. Value
		    drive strengths are:
		    0: no (PMIC_GPIO_STRENGTH_NO)
		    1: high (PMIC_GPIO_STRENGTH_HIGH) 0.9mA @ 1.8V - 1.9mA @ 2.6V
		    2: medium (PMIC_GPIO_STRENGTH_MED) 0.6mA @ 1.8V - 1.25mA @ 2.6V
		    3: low (PMIC_GPIO_STRENGTH_LOW) 0.15mA @ 1.8V - 0.3mA @ 2.6V
		    as defined in <dt-bindings/pinctrl/qcom,pmic-gpio.h>

- drive-push-pull:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are configured in push-pull mode.

- drive-open-drain:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are configured in open-drain mode.

- drive-open-source:
	Usage: optional
	Value type: <none>
	Definition: The specified pins are configured in open-source mode.

Example:

	pm8921_gpio: gpio@150 {
		compatible = "qcom,pm8921-gpio";
		reg = <0x150 0x160>;
		interrupts = <192 1>, <193 1>, <194 1>,
			     <195 1>, <196 1>, <197 1>,
			     <198 1>, <199 1>, <200 1>,
			     <201 1>, <202 1>, <203 1>,
			     <204 1>, <205 1>, <206 1>,
			     <207 1>, <208 1>, <209 1>,
			     <210 1>, <211 1>, <212 1>,
			     <213 1>, <214 1>, <215 1>,
			     <216 1>, <217 1>, <218 1>,
			     <219 1>, <220 1>, <221 1>,
			     <222 1>, <223 1>, <224 1>,
			     <225 1>, <226 1>, <227 1>,
			     <228 1>, <229 1>, <230 1>,
			     <231 1>, <232 1>, <233 1>,
			     <234 1>, <235 1>;

		gpio-controller;
		#gpio-cells = <2>;

		pm8921_gpio_keys: gpio-keys {
			volume-keys {
				pins = "gpio20", "gpio21";
				function = "normal";

				input-enable;
				bias-pull-up;
				drive-push-pull;
				qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
				power-source = <PM8921_GPIO_S4>;
			};
		};
	};