| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 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 | ... |