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 7title: Simple MMC power sequence provider binding 8 9maintainers: 10 - Ulf Hansson <ulf.hansson@linaro.org> 11 12description: 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 17properties: 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 50required: 51 - compatible 52 53additionalProperties: false 54 55examples: 56 - | 57 #include <dt-bindings/gpio/gpio.h> 58 sdhci0_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... 65