1ImgTec TZ1090 PDC pin controller
2
3Required properties:
4- compatible: "img,tz1090-pdc-pinctrl"
5- reg: Should contain the register physical address and length of the
6  SOC_GPIO_CONTROL registers in the PDC register region.
7
8Please refer to pinctrl-bindings.txt in this directory for details of the
9common pinctrl bindings used by client devices, including the meaning of the
10phrase "pin configuration node".
11
12TZ1090-PDC's pin configuration nodes act as a container for an arbitrary number
13of subnodes. Each of these subnodes represents some desired configuration for a
14pin, a group, or a list of pins or groups. This configuration can include the
15mux function to select on those pin(s)/group(s), and various pin configuration
16parameters, such as pull-up, drive strength, etc.
17
18The name of each subnode is not important; all subnodes should be enumerated
19and processed purely based on their content.
20
21Each subnode only affects those parameters that are explicitly listed. In
22other words, a subnode that lists a mux function but no pin configuration
23parameters implies no information about any pin configuration parameters.
24Similarly, a pin subnode that describes a pullup parameter implies no
25information about e.g. the mux function. For this reason, even seemingly boolean
26values are actually tristates in this binding: unspecified, off, or on.
27Unspecified is represented as an absent property, and off/on are represented as
28integer values 0 and 1.
29
30Required subnode-properties:
31- tz1090,pins : An array of strings. Each string contains the name of a pin or
32  group. Valid values for these names are listed below.
33
34Optional subnode-properties:
35- tz1090,function: A string containing the name of the function to mux to the
36  pin or group. Valid values for function names are listed below, including
37  which pingroups can be muxed to them.
38- supported generic pinconfig properties (for further details see
39  Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt):
40  - bias-disable
41  - bias-high-impedance
42  - bias-bus-hold
43  - bias-pull-up
44  - bias-pull-down
45  - input-schmitt-enable
46  - input-schmitt-disable
47  - drive-strength: Integer, control drive strength of pins in mA.
48      2: 2mA
49      4: 4mA
50      8: 8mA
51      12: 12mA
52  - low-power-enable: Flag, power-on-start weak pull-down for invalid power.
53  - low-power-disable: Flag, power-on-start weak pull-down disabled.
54
55Note that many of these properties are only valid for certain specific pins
56or groups. See the TZ1090 TRM for complete details regarding which groups
57support which functionality. The Linux pinctrl driver may also be a useful
58reference.
59
60Valid values for pin and group names are:
61
62  pins:
63
64    These all support bias-high-impediance, bias-pull-up, bias-pull-down, and
65    bias-bus-hold (which can also be provided to any of the groups below to set
66    it for all gpio pins in that group).
67
68    gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data, ext_power.
69
70  mux groups:
71
72    These all support function.
73
74    gpio0
75        pins:       gpio0.
76        function:   ir_mod_stable_out.
77    gpio1
78        pins:       gpio1.
79        function:   ir_mod_power_out.
80
81  drive groups:
82
83    These support input-schmitt-enable, input-schmitt-disable,
84    drive-strength, low-power-enable, and low-power-disable.
85
86    pdc
87        pins:   gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data,
88                ext_power.
89
90Example:
91
92	pinctrl_pdc: pinctrl@02006500 {
93		#gpio-range-cells = <3>;
94		compatible = "img,tz1090-pdc-pinctrl";
95		reg = <0x02006500 0x100>;
96	};
97
98Example board file extracts:
99
100	&pinctrl_pdc {
101		pinctrl-names = "default";
102		pinctrl-0 = <&syswake_default>;
103
104		syswake_default: syswakes {
105			syswake_cfg {
106				tz1090,pins =	"sys_wake0",
107						"sys_wake1",
108						"sys_wake2";
109				pull-up;
110			};
111		};
112		irmod_default: irmod {
113			gpio0_cfg {
114				tz1090,pins =	"gpio0";
115				tz1090,function = "ir_mod_stable_out";
116			};
117			gpio1_cfg {
118				tz1090,pins =	"gpio1";
119				tz1090,function = "ir_mod_power_out";
120			};
121		};
122	};
123
124	ir: ir@02006200 {
125		pinctrl-names = "default";
126		pinctrl-0 = <&irmod_default>;
127	};
128