Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/gpio/fairchild,74hc595.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Generic 8-bit shift register
   8
   9 maintainers:
  10   - Maxime Ripard <mripard@kernel.org>
  11
  12 properties:
  13   compatible:
  14     enum:
  15       - fairchild,74hc595
  16       - nxp,74lvc594
  17
  18   reg:
  19     maxItems: 1
  20
  21   gpio-controller: true
  22
  23   '#gpio-cells':
  24     description:
  25       The second cell is only used to specify the GPIO polarity.
  26     const: 2
  27
  28   registers-number:
  29     $ref: /schemas/types.yaml#/definitions/uint32
  30     description: Number of daisy-chained shift registers
  31
  32   enable-gpios:
  33     description: GPIO connected to the OE (Output Enable) pin.
  34     maxItems: 1
  35
  36   spi-max-frequency: true
  37
  38 patternProperties:
  39   "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
  40     type: object
  41
  42     properties:
  43       gpio-hog: true
  44       gpios: true
  45       output-high: true
  46       output-low: true
  47       line-name: true
  48
  49     required:
  50       - gpio-hog
  51       - gpios
  52
  53     additionalProperties: false
  54
  55 required:
  56   - compatible
  57   - reg
  58   - gpio-controller
  59   - '#gpio-cells'
  60   - registers-number
  61
  62 additionalProperties: false
  63
  64 examples:
  65   - |
  66     spi {
  67             #address-cells = <1>;
  68             #size-cells = <0>;
  69
  70             gpio5: gpio5@0 {
  71                     compatible = "fairchild,74hc595";
  72                     reg = <0>;
  73                     gpio-controller;
  74                     #gpio-cells = <2>;
  75                     registers-number = <4>;
  76                     spi-max-frequency = <100000>;
  77             };
  78     };