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 ...
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