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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Simple MMC power sequence provider binding
maintainers:
- Ulf Hansson <ulf.hansson@linaro.org>
description:
The purpose of the simple MMC power sequence provider is to supports a set
of common properties between various SOC designs. It thus enables us to use
the same provider for several SOC designs.
properties:
compatible:
const: mmc-pwrseq-simple
reset-gpios:
minItems: 1
# Put some limit to avoid false warnings
maxItems: 32
description:
contains a list of GPIO specifiers. The reset GPIOs are asserted
at initialization and prior we start the power up procedure of the card.
They will be de-asserted right after the power has been provided to the
card.
clocks:
minItems: 1
description: Handle for the entry in clock-names.
clock-names:
items:
- const: ext_clock
description: External clock provided to the card.
post-power-on-delay-ms:
description:
Delay in ms after powering the card and de-asserting the
reset-gpios (if any).
$ref: /schemas/types.yaml#/definitions/uint32
power-off-delay-us:
description:
Delay in us after asserting the reset-gpios (if any)
during power off of the card.
$ref: /schemas/types.yaml#/definitions/uint32
required:
- compatible
examples:
- |
#include <dt-bindings/gpio/gpio.h>
sdhci0_pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
clocks = <&clk_32768_ck>;
clock-names = "ext_clock";
};
...
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