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- These properties are common to multiple MMC host controllers. Any host
- that requires the respective functionality should implement them using
- these definitions.
- Interpreted by the OF core:
- - reg: Registers location and length.
- - interrupts: Interrupts used by the MMC controller.
- Required properties:
- - bus-width: Number of data lines, can be <1>, <4>, or <8>
- Card detection:
- If no property below is supplied, standard SDHCI card detect is used.
- Only one of the properties in this section should be supplied:
- - broken-cd: There is no card detection available; polling must be used.
- - cd-gpios: Specify GPIOs for card detection, see gpio binding
- - non-removable: non-removable slot (like eMMC); assume always present.
- Optional properties:
- - wp-gpios: Specify GPIOs for write protection, see gpio binding
- - cd-inverted: when present, polarity on the cd gpio line is inverted
- - wp-inverted: when present, polarity on the wp gpio line is inverted
- - max-frequency: maximum operating clock frequency
- Example:
- sdhci@ab000000 {
- compatible = "sdhci";
- reg = <0xab000000 0x200>;
- interrupts = <23>;
- bus-width = <4>;
- cd-gpios = <&gpio 69 0>;
- cd-inverted;
- wp-gpios = <&gpio 70 0>;
- max-frequency = <50000000>;
- }
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