Bindings/mmc/mmc-pwrseq-simple.yaml

   1 # SPDX-License-Identifier: GPL-2.0
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Simple MMC power sequence provider
   8
   9 maintainers:
  10   - Ulf Hansson <ulf.hansson@linaro.org>
  11
  12 description:
  13   The purpose of the simple MMC power sequence provider is to supports a set
  14   of common properties between various SOC designs. It thus enables us to use
  15   the same provider for several SOC designs.
  16
  17 properties:
  18   compatible:
  19     const: mmc-pwrseq-simple
  20
  21   reset-gpios:
  22     minItems: 1
  23     # Put some limit to avoid false warnings
  24     maxItems: 32
  25     description:
  26       contains a list of GPIO specifiers. The reset GPIOs are asserted
  27       at initialization and prior we start the power up procedure of the card.
  28       They will be de-asserted right after the power has been provided to the
  29       card.
  30
  31   clocks:
  32     minItems: 1
  33     description: Handle for the entry in clock-names.
  34
  35   clock-names:
  36     items:
  37       - const: ext_clock
  38     description: External clock provided to the card.
  39
  40   post-power-on-delay-ms:
  41     description:
  42       Delay in ms after powering the card and de-asserting the
  43       reset-gpios (if any).
  44
  45   power-off-delay-us:
  46     description:
  47       Delay in us after asserting the reset-gpios (if any)
  48       during power off of the card.
  49
  50 required:
  51   - compatible
  52
  53 additionalProperties: false
  54
  55 examples:
  56   - |
  57     #include <dt-bindings/gpio/gpio.h>
  58     pwrseq {
  59       compatible = "mmc-pwrseq-simple";
  60       reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
  61       clocks = <&clk_32768_ck>;
  62       clock-names = "ext_clock";
  63     };
  64 ...