| # 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 |
| |
| additionalProperties: false |
| |
| 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"; |
| }; |
| ... |