Documentation/devicetree/bindings/pinctrl/img,tz1090-pdc-pinctrl.txt

   1 ImgTec TZ1090 PDC pin controller
   2
   3 Required 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
   8 Please refer to pinctrl-bindings.txt in this directory for details of the
   9 common pinctrl bindings used by client devices, including the meaning of the
  10 phrase "pin configuration node".
  11
  12 TZ1090-PDC's pin configuration nodes act as a container for an arbitrary number
  13 of subnodes. Each of these subnodes represents some desired configuration for a
  14 pin, a group, or a list of pins or groups. This configuration can include the
  15 mux function to select on those pin(s)/group(s), and various pin configuration
  16 parameters, such as pull-up, drive strength, etc.
  17
  18 The name of each subnode is not important; all subnodes should be enumerated
  19 and processed purely based on their content.
  20
  21 Each subnode only affects those parameters that are explicitly listed. In
  22 other words, a subnode that lists a mux function but no pin configuration
  23 parameters implies no information about any pin configuration parameters.
  24 Similarly, a pin subnode that describes a pullup parameter implies no
  25 information about e.g. the mux function. For this reason, even seemingly boolean
  26 values are actually tristates in this binding: unspecified, off, or on.
  27 Unspecified is represented as an absent property, and off/on are represented as
  28 integer values 0 and 1.
  29
  30 Required 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
  34 Optional 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
  55 Note that many of these properties are only valid for certain specific pins
  56 or groups. See the TZ1090 TRM for complete details regarding which groups
  57 support which functionality. The Linux pinctrl driver may also be a useful
  58 reference.
  59
  60 Valid 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
  90 Example:
  91
  92         pinctrl_pdc: pinctrl@02006500 {
  93                 #gpio-range-cells = <3>;
  94                 compatible = "img,tz1090-pdc-pinctrl";
  95                 reg = <0x02006500 0x100>;
  96         };
  97
  98 Example 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         };