b477426e37
The file Documentation/devicetree/bindings/mmc/mmc.txt is common for all MMC host drivers. Use a generic MMC host reference instead of an SDHCI left-over. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
These properties are common to multiple MMC host controllers. Any host
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that requires the respective functionality should implement them using
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these definitions.
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Interpreted by the OF core:
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- reg: Registers location and length.
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- interrupts: Interrupts used by the MMC controller.
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Required properties:
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- bus-width: Number of data lines, can be <1>, <4>, or <8>
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Card detection:
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If no property below is supplied, host native card detect is used.
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Only one of the properties in this section should be supplied:
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- broken-cd: There is no card detection available; polling must be used.
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- cd-gpios: Specify GPIOs for card detection, see gpio binding
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- non-removable: non-removable slot (like eMMC); assume always present.
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Optional properties:
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- wp-gpios: Specify GPIOs for write protection, see gpio binding
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- cd-inverted: when present, polarity on the cd gpio line is inverted
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- wp-inverted: when present, polarity on the wp gpio line is inverted
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- max-frequency: maximum operating clock frequency
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- no-1-8-v: when present, denotes that 1.8v card voltage is not supported on
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this system, even if the controller claims it is.
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Optional SDIO properties:
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- keep-power-in-suspend: Preserves card power during a suspend/resume cycle
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- enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion
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Example:
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sdhci@ab000000 {
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compatible = "sdhci";
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reg = <0xab000000 0x200>;
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interrupts = <23>;
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bus-width = <4>;
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cd-gpios = <&gpio 69 0>;
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cd-inverted;
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wp-gpios = <&gpio 70 0>;
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max-frequency = <50000000>;
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keep-power-in-suspend;
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enable-sdio-wakeup;
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}
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