1 Pincontrol driver for MAX77620 Power management IC from Maxim Semiconductor.
2
3 Device has 8 GPIO pins which can be configured as GPIO as well as the
4 special IO functions.
5
6 Please refer file <devicetree/bindings/pinctrl/pinctrl-bindings.txt>
7 for details of the common pinctrl bindings used by client devices,
8 including the meaning of the phrase "pin configuration node".
9
10 Optional Pinmux properties:
11 --------------------------
12 Following properties are required if default setting of pins are required
13 at boot.
14 - pinctrl-names: A pinctrl state named per <pinctrl-bindings.txt>.
15 - pinctrl[0...n]: Properties to contain the phandle for pinctrl states per
16 <pinctrl-bindings.txt>.
17
18 The pin configurations are defined as child of the pinctrl states node. Each
19 sub-node have following properties:
20
21 Required properties:
22 ------------------
23 - pins: List of pins. Valid values of pins properties are:
24 gpio0, gpio1, gpio2, gpio3, gpio4, gpio5, gpio6, gpio7.
25
26 Optional properties:
27 -------------------
28 Following are optional properties defined as pinmux DT binding document
29 <pinctrl-bindings.txt>. Absence of properties will leave the configuration
30 on default.
31 function,
32 drive-push-pull,
33 drive-open-drain,
34 bias-pull-up,
35 bias-pull-down.
36
37 Valid values for function properties are:
38 gpio, lpm-control-in, fps-out, 32k-out, sd0-dvs-in, sd1-dvs-in,
39 reference-out
40
41 There are also customised properties for the GPIO1, GPIO2 and GPIO3. These
42 customised properties are required to configure FPS configuration parameters
43 of these GPIOs. Please refer <devicetree/bindings/mfd/max77620.txt> for more
44 detail of Flexible Power Sequence (FPS).
45
46 - maxim,active-fps-source: FPS source for the GPIOs to get
47 enabled/disabled when system is in
48 active state. Valid values are:
49 - MAX77620_FPS_SRC_0,
50 FPS source is FPS0.
51 - MAX77620_FPS_SRC_1,
52 FPS source is FPS1
53 - MAX77620_FPS_SRC_2 and
54 FPS source is FPS2
55 - MAX77620_FPS_SRC_NONE.
56 GPIO is not controlled
57 by FPS events and it gets
58 enabled/disabled by register
59 access.
60 Absence of this property will leave
61 the FPS configuration register for that
62 GPIO to default configuration.
63
64 - maxim,active-fps-power-up-slot: Sequencing event slot number on which
65 the GPIO get enabled when
66 master FPS input event set to HIGH.
67 Valid values are 0 to 7.
68 This is applicable if FPS source is
69 selected as FPS0, FPS1 or FPS2.
70
71 - maxim,active-fps-power-down-slot: Sequencing event slot number on which
72 the GPIO get disabled when master
73 FPS input event set to LOW.
74 Valid values are 0 to 7.
75 This is applicable if FPS source is
76 selected as FPS0, FPS1 or FPS2.
77
78 - maxim,suspend-fps-source: This is same as property
79 "maxim,active-fps-source" but value
80 get configured when system enters in
81 to suspend state.
82
83 - maxim,suspend-fps-power-up-slot: This is same as property
84 "maxim,active-fps-power-up-slot" but
85 this value get configured into FPS
86 configuration register when system
87 enters into suspend.
88 This is applicable if suspend state
89 FPS source is selected as FPS0, FPS1 or
90
91 - maxim,suspend-fps-power-down-slot: This is same as property
92 "maxim,active-fps-power-down-slot" but
93 this value get configured into FPS
94 configuration register when system
95 enters into suspend.
96 This is applicable if suspend state
97 FPS source is selected as FPS0, FPS1 or
98 FPS2.
99
100 Example:
101 --------
102 #include <dt-bindings/mfd/max77620.h>
103 ...
104 max77620@3c {
105
106 pinctrl-names = "default";
107 pinctrl-0 = <&spmic_default>;
108
109 spmic_default: pinmux@0 {
110 pin_gpio0 {
111 pins = "gpio0";
112 function = "gpio";
113 };
114
115 pin_gpio1 {
116 pins = "gpio1";
117 function = "fps-out";
118 maxim,active-fps-source = <MAX77620_FPS_SRC_0>;
119 };
120
121 pin_gpio2 {
122 pins = "gpio2";
123 function = "fps-out";
124 maxim,active-fps-source = <MAX77620_FPS_SRC_1>;
125 };
126 };
127 };
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