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-rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml new file mode 100644 index 000000000..226fb1919 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml @@ -0,0 +1,64 @@ +# 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). + + power-off-delay-us: + description: + Delay in us after asserting the reset-gpios (if any) + during power off of the card. + +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"; + }; +... |