1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun%YAML 1.2 3*4882a593Smuzhiyun--- 4*4882a593Smuzhiyun$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml# 5*4882a593Smuzhiyun$schema: http://devicetree.org/meta-schemas/core.yaml# 6*4882a593Smuzhiyun 7*4882a593Smuzhiyuntitle: Simple MMC power sequence provider binding 8*4882a593Smuzhiyun 9*4882a593Smuzhiyunmaintainers: 10*4882a593Smuzhiyun - Ulf Hansson <ulf.hansson@linaro.org> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyundescription: 13*4882a593Smuzhiyun The purpose of the simple MMC power sequence provider is to supports a set 14*4882a593Smuzhiyun of common properties between various SOC designs. It thus enables us to use 15*4882a593Smuzhiyun the same provider for several SOC designs. 16*4882a593Smuzhiyun 17*4882a593Smuzhiyunproperties: 18*4882a593Smuzhiyun compatible: 19*4882a593Smuzhiyun const: mmc-pwrseq-simple 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun reset-gpios: 22*4882a593Smuzhiyun minItems: 1 23*4882a593Smuzhiyun # Put some limit to avoid false warnings 24*4882a593Smuzhiyun maxItems: 32 25*4882a593Smuzhiyun description: 26*4882a593Smuzhiyun contains a list of GPIO specifiers. The reset GPIOs are asserted 27*4882a593Smuzhiyun at initialization and prior we start the power up procedure of the card. 28*4882a593Smuzhiyun They will be de-asserted right after the power has been provided to the 29*4882a593Smuzhiyun card. 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun clocks: 32*4882a593Smuzhiyun minItems: 1 33*4882a593Smuzhiyun description: Handle for the entry in clock-names. 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun clock-names: 36*4882a593Smuzhiyun items: 37*4882a593Smuzhiyun - const: ext_clock 38*4882a593Smuzhiyun description: External clock provided to the card. 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun post-power-on-delay-ms: 41*4882a593Smuzhiyun description: 42*4882a593Smuzhiyun Delay in ms after powering the card and de-asserting the 43*4882a593Smuzhiyun reset-gpios (if any). 44*4882a593Smuzhiyun $ref: /schemas/types.yaml#/definitions/uint32 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun power-off-delay-us: 47*4882a593Smuzhiyun description: 48*4882a593Smuzhiyun Delay in us after asserting the reset-gpios (if any) 49*4882a593Smuzhiyun during power off of the card. 50*4882a593Smuzhiyun $ref: /schemas/types.yaml#/definitions/uint32 51*4882a593Smuzhiyun 52*4882a593Smuzhiyunrequired: 53*4882a593Smuzhiyun - compatible 54*4882a593Smuzhiyun 55*4882a593SmuzhiyunadditionalProperties: false 56*4882a593Smuzhiyun 57*4882a593Smuzhiyunexamples: 58*4882a593Smuzhiyun - | 59*4882a593Smuzhiyun #include <dt-bindings/gpio/gpio.h> 60*4882a593Smuzhiyun sdhci0_pwrseq { 61*4882a593Smuzhiyun compatible = "mmc-pwrseq-simple"; 62*4882a593Smuzhiyun reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>; 63*4882a593Smuzhiyun clocks = <&clk_32768_ck>; 64*4882a593Smuzhiyun clock-names = "ext_clock"; 65*4882a593Smuzhiyun }; 66*4882a593Smuzhiyun... 67