nxp,pcf8575.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/gpio/nxp,pcf8575.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: PCF857x-compatible I/O expanders
    8 
    9 maintainers:
   10   - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
   11 
   12 description:
   13   The PCF857x-compatible chips have "quasi-bidirectional" I/O lines that can be
   14   driven high by a pull-up current source or driven low to ground. This
   15   combines the direction and output level into a single bit per line, which
   16   can't be read back. We can't actually know at initialization time whether a
   17   line is configured (a) as output and driving the signal low/high, or (b) as
   18   input and reporting a low/high value, without knowing the last value written
   19   since the chip came out of reset (if any). The only reliable solution for
   20   setting up line direction is thus to do it explicitly.
   21 
   22 properties:
   23   compatible:
   24     enum:
   25       - maxim,max7328
   26       - maxim,max7329
   27       - nxp,pca8574
   28       - nxp,pca8575
   29       - nxp,pca9670
   30       - nxp,pca9671
   31       - nxp,pca9672
   32       - nxp,pca9673
   33       - nxp,pca9674
   34       - nxp,pca9675
   35       - nxp,pcf8574
   36       - nxp,pcf8574a
   37       - nxp,pcf8575
   38 
   39   reg:
   40     maxItems: 1
   41 
   42   gpio-controller: true
   43 
   44   '#gpio-cells':
   45     const: 2
   46     description:
   47       The first cell is the GPIO number and the second cell specifies GPIO
   48       flags, as defined in <dt-bindings/gpio/gpio.h>. Only the GPIO_ACTIVE_HIGH
   49       and GPIO_ACTIVE_LOW flags are supported.
   50 
   51   lines-initial-states:
   52     $ref: /schemas/types.yaml#/definitions/uint32
   53     description:
   54       Bitmask that specifies the initial state of each line.
   55       When a bit is set to zero, the corresponding line will be initialized to
   56       the input (pulled-up) state.
   57       When the  bit is set to one, the line will be initialized to the
   58       low-level output state.
   59       If the property is not specified all lines will be initialized to the
   60       input state.
   61 
   62   interrupts:
   63     maxItems: 1
   64 
   65   interrupt-controller: true
   66 
   67   '#interrupt-cells':
   68     const: 2
   69 
   70   wakeup-source: true
   71 
   72 patternProperties:
   73   "^(.+-hog(-[0-9]+)?)$":
   74     type: object
   75 
   76     required:
   77       - gpio-hog
   78 
   79 required:
   80   - compatible
   81   - reg
   82   - gpio-controller
   83   - '#gpio-cells'
   84 
   85 additionalProperties: false
   86 
   87 examples:
   88   - |
   89     i2c {
   90             #address-cells = <1>;
   91             #size-cells = <0>;
   92 
   93             pcf8575: gpio@20 {
   94                     compatible = "nxp,pcf8575";
   95                     reg = <0x20>;
   96                     interrupt-parent = <&irqpin2>;
   97                     interrupts = <3 0>;
   98                     gpio-controller;
   99                     #gpio-cells = <2>;
  100                     interrupt-controller;
  101                     #interrupt-cells = <2>;
  102             };
  103     };

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sys/contrib/device-tree/Bindings/gpio/nxp,pcf8575.yaml