Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt

   1 Qualcomm PMIC GPIO block
   2
   3 This binding describes the GPIO block(s) found in the 8xxx series of
   4 PMIC's from Qualcomm.
   5
   6 - compatible:
   7         Usage: required
   8         Value type: <string>
   9         Definition: must be one of:
  10                     "qcom,pm8018-gpio"
  11                     "qcom,pm8038-gpio"
  12                     "qcom,pm8058-gpio"
  13                     "qcom,pm8916-gpio"
  14                     "qcom,pm8917-gpio"
  15                     "qcom,pm8921-gpio"
  16                     "qcom,pm8941-gpio"
  17                     "qcom,pm8994-gpio"
  18                     "qcom,pma8084-gpio"
  19
  20 - reg:
  21         Usage: required
  22         Value type: <prop-encoded-array>
  23         Definition: Register base of the GPIO block and length.
  24
  25 - interrupts:
  26         Usage: required
  27         Value type: <prop-encoded-array>
  28         Definition: Must contain an array of encoded interrupt specifiers for
  29                     each available GPIO
  30
  31 - gpio-controller:
  32         Usage: required
  33         Value type: <none>
  34         Definition: Mark the device node as a GPIO controller
  35
  36 - #gpio-cells:
  37         Usage: required
  38         Value type: <u32>
  39         Definition: Must be 2;
  40                     the first cell will be used to define gpio number and the
  41                     second denotes the flags for this gpio
  42
  43 Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
  44 a general description of GPIO and interrupt bindings.
  45
  46 Please refer to pinctrl-bindings.txt in this directory for details of the
  47 common pinctrl bindings used by client devices, including the meaning of the
  48 phrase "pin configuration node".
  49
  50 The pin configuration nodes act as a container for an arbitrary number of
  51 subnodes. Each of these subnodes represents some desired configuration for a
  52 pin or a list of pins. This configuration can include the
  53 mux function to select on those pin(s), and various pin configuration
  54 parameters, as listed below.
  55
  56
  57 SUBNODES:
  58
  59 The name of each subnode is not important; all subnodes should be enumerated
  60 and processed purely based on their content.
  61
  62 Each subnode only affects those parameters that are explicitly listed. In
  63 other words, a subnode that lists a mux function but no pin configuration
  64 parameters implies no information about any pin configuration parameters.
  65 Similarly, a pin subnode that describes a pullup parameter implies no
  66 information about e.g. the mux function.
  67
  68 The following generic properties as defined in pinctrl-bindings.txt are valid
  69 to specify in a pin configuration subnode:
  70
  71 - pins:
  72         Usage: required
  73         Value type: <string-array>
  74         Definition: List of gpio pins affected by the properties specified in
  75                     this subnode.  Valid pins are:
  76                     gpio1-gpio6 for pm8018
  77                     gpio1-gpio12 for pm8038
  78                     gpio1-gpio40 for pm8058
  79                     gpio1-gpio4 for pm8916
  80                     gpio1-gpio38 for pm8917
  81                     gpio1-gpio44 for pm8921
  82                     gpio1-gpio36 for pm8941
  83                     gpio1-gpio22 for pm8994
  84                     gpio1-gpio22 for pma8084
  85
  86 - function:
  87         Usage: required
  88         Value type: <string>
  89         Definition: Specify the alternative function to be configured for the
  90                     specified pins.  Valid values are:
  91                     "normal",
  92                     "paired",
  93                     "func1",
  94                     "func2",
  95                     "dtest1",
  96                     "dtest2",
  97                     "dtest3",
  98                     "dtest4"
  99
 100 - bias-disable:
 101         Usage: optional
 102         Value type: <none>
 103         Definition: The specified pins should be configured as no pull.
 104
 105 - bias-pull-down:
 106         Usage: optional
 107         Value type: <none>
 108         Definition: The specified pins should be configured as pull down.
 109
 110 - bias-pull-up:
 111         Usage: optional
 112         Value type: <empty>
 113         Definition: The specified pins should be configured as pull up.
 114
 115 - qcom,pull-up-strength:
 116         Usage: optional
 117         Value type: <u32>
 118         Definition: Specifies the strength to use for pull up, if selected.
 119                     Valid values are; as defined in
 120                     <dt-bindings/pinctrl/qcom,pmic-gpio.h>:
 121                     1: 30uA                     (PMIC_GPIO_PULL_UP_30)
 122                     2: 1.5uA                    (PMIC_GPIO_PULL_UP_1P5)
 123                     3: 31.5uA                   (PMIC_GPIO_PULL_UP_31P5)
 124                     4: 1.5uA + 30uA boost       (PMIC_GPIO_PULL_UP_1P5_30)
 125                     If this property is omitted 30uA strength will be used if
 126                     pull up is selected
 127
 128 - bias-high-impedance:
 129         Usage: optional
 130         Value type: <none>
 131         Definition: The specified pins will put in high-Z mode and disabled.
 132
 133 - input-enable:
 134         Usage: optional
 135         Value type: <none>
 136         Definition: The specified pins are put in input mode.
 137
 138 - output-high:
 139         Usage: optional
 140         Value type: <none>
 141         Definition: The specified pins are configured in output mode, driven
 142                     high.
 143
 144 - output-low:
 145         Usage: optional
 146         Value type: <none>
 147         Definition: The specified pins are configured in output mode, driven
 148                     low.
 149
 150 - power-source:
 151         Usage: optional
 152         Value type: <u32>
 153         Definition: Selects the power source for the specified pins. Valid
 154                     power sources are defined per chip in
 155                     <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 156
 157 - qcom,drive-strength:
 158         Usage: optional
 159         Value type: <u32>
 160         Definition: Selects the drive strength for the specified pins. Value
 161                     drive strengths are:
 162                     0: no (PMIC_GPIO_STRENGTH_NO)
 163                     1: high (PMIC_GPIO_STRENGTH_HIGH) 0.9mA @ 1.8V - 1.9mA @ 2.6V
 164                     2: medium (PMIC_GPIO_STRENGTH_MED) 0.6mA @ 1.8V - 1.25mA @ 2.6V
 165                     3: low (PMIC_GPIO_STRENGTH_LOW) 0.15mA @ 1.8V - 0.3mA @ 2.6V
 166                     as defined in <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 167
 168 - drive-push-pull:
 169         Usage: optional
 170         Value type: <none>
 171         Definition: The specified pins are configured in push-pull mode.
 172
 173 - drive-open-drain:
 174         Usage: optional
 175         Value type: <none>
 176         Definition: The specified pins are configured in open-drain mode.
 177
 178 - drive-open-source:
 179         Usage: optional
 180         Value type: <none>
 181         Definition: The specified pins are configured in open-source mode.
 182
 183 Example:
 184
 185         pm8921_gpio: gpio@150 {
 186                 compatible = "qcom,pm8921-gpio";
 187                 reg = <0x150 0x160>;
 188                 interrupts = <192 1>, <193 1>, <194 1>,
 189                              <195 1>, <196 1>, <197 1>,
 190                              <198 1>, <199 1>, <200 1>,
 191                              <201 1>, <202 1>, <203 1>,
 192                              <204 1>, <205 1>, <206 1>,
 193                              <207 1>, <208 1>, <209 1>,
 194                              <210 1>, <211 1>, <212 1>,
 195                              <213 1>, <214 1>, <215 1>,
 196                              <216 1>, <217 1>, <218 1>,
 197                              <219 1>, <220 1>, <221 1>,
 198                              <222 1>, <223 1>, <224 1>,
 199                              <225 1>, <226 1>, <227 1>,
 200                              <228 1>, <229 1>, <230 1>,
 201                              <231 1>, <232 1>, <233 1>,
 202                              <234 1>, <235 1>;
 203
 204                 gpio-controller;
 205                 #gpio-cells = <2>;
 206
 207                 pm8921_gpio_keys: gpio-keys {
 208                         volume-keys {
 209                                 pins = "gpio20", "gpio21";
 210                                 function = "normal";
 211
 212                                 input-enable;
 213                                 bias-pull-up;
 214                                 drive-push-pull;
 215                                 qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
 216                                 power-source = <PM8921_GPIO_S4>;
 217                         };
 218                 };
 219         };