0001 # SPDX-License-Identifier: GPL-2.0
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: Simple MMC power sequence provider binding
0008
0009 maintainers:
0010 - Ulf Hansson <ulf.hansson@linaro.org>
0011
0012 description:
0013 The purpose of the simple MMC power sequence provider is to supports a set
0014 of common properties between various SOC designs. It thus enables us to use
0015 the same provider for several SOC designs.
0016
0017 properties:
0018 compatible:
0019 const: mmc-pwrseq-simple
0020
0021 reset-gpios:
0022 minItems: 1
0023 # Put some limit to avoid false warnings
0024 maxItems: 32
0025 description:
0026 contains a list of GPIO specifiers. The reset GPIOs are asserted
0027 at initialization and prior we start the power up procedure of the card.
0028 They will be de-asserted right after the power has been provided to the
0029 card.
0030
0031 clocks:
0032 minItems: 1
0033 description: Handle for the entry in clock-names.
0034
0035 clock-names:
0036 items:
0037 - const: ext_clock
0038 description: External clock provided to the card.
0039
0040 post-power-on-delay-ms:
0041 description:
0042 Delay in ms after powering the card and de-asserting the
0043 reset-gpios (if any).
0044
0045 power-off-delay-us:
0046 description:
0047 Delay in us after asserting the reset-gpios (if any)
0048 during power off of the card.
0049
0050 required:
0051 - compatible
0052
0053 additionalProperties: false
0054
0055 examples:
0056 - |
0057 #include <dt-bindings/gpio/gpio.h>
0058 sdhci0_pwrseq {
0059 compatible = "mmc-pwrseq-simple";
0060 reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
0061 clocks = <&clk_32768_ck>;
0062 clock-names = "ext_clock";
0063 };
0064 ...
