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authorLars-Peter Clausen <lars@metafoo.de>2015-05-06 20:31:20 +0200
committerNitin Garg <nitin.garg@nxp.com>2016-01-14 10:59:25 -0600
commitabc87e1105fa45cbd61a17546c6db9852fb3a44b (patch)
treea3dba8993501ac3894d6f6d3d2c25ec906f63279 /Documentation
parentcd1ba3e917cfbb15b66873636ba0c570617d7ae1 (diff)
mmc: dt: Allow to specify that no write protect signal is present
Allow to specify in the device-tree that no physical write-protect signal is connected to a particular instance of a MMC controller. Setting the property will cause the core will assume that the SD card is always read-write. The name for the new property is 'disable-wp' and was chosen based on the property with the same function from the Synopsys designware mobile storage host controller DT bindings specification. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> (cherry picked from commit 19f4424677455a01b93163975cfbcffa9adb3336)
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/mmc/mmc.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 438899e8829b..0384fc3f64e8 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -21,6 +21,11 @@ Optional properties:
below for the case, when a GPIO is used for the CD line
- wp-inverted: when present, polarity on the WP line is inverted. See the note
below for the case, when a GPIO is used for the WP line
+- disable-wp: When set no physical WP line is present. This property should
+ only be specified when the controller has a dedicated write-protect
+ detection logic. If a GPIO is always used for the write-protect detection
+ logic it is sufficient to not specify wp-gpios property in the absence of a WP
+ line.
- 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.