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-rw-r--r--Documentation/devicetree/bindings/mmc/mmc.txt25
1 files changed, 21 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 6e70dcde0a7..a591c6741d7 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -2,16 +2,31 @@ 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:
-- cd-gpios : Specify GPIOs for card detection, see gpio binding
-- wp-gpios : Specify GPIOs for write protection, see gpio binding
-- cd-inverted: when present, polarity on the wp gpio line is inverted
+- 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
-- non-removable: non-removable slot (like eMMC)
- max-frequency: maximum operating clock frequency
+- no-1-8-v: when present, denotes that 1.8v card voltage is not supported on
+ this system, even if the controller claims it is.
+
+Optional SDIO properties:
+- keep-power-in-suspend: Preserves card power during a suspend/resume cycle
+- enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion
Example:
@@ -24,4 +39,6 @@ sdhci@ab000000 {
cd-inverted;
wp-gpios = <&gpio 70 0>;
max-frequency = <50000000>;
+ keep-power-in-suspend;
+ enable-sdio-wakeup;
}