diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2015-05-06 20:31:20 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-06-01 09:07:00 +0200 |
| commit | 19f4424677455a01b93163975cfbcffa9adb3336 (patch) | |
| tree | 995b9643e6ac498a8d9991e6df13bd2cf6db05e3 /Documentation/devicetree/bindings/mmc | |
| parent | 9f6e0bff2afb52a4c29f5ca8a4db01810357974e (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>
Diffstat (limited to 'Documentation/devicetree/bindings/mmc')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc.txt | 5 |
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. |