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@xxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Pawel Moll <pawel.moll@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx> Cc: Kumar Gala <galak@xxxxxxxxxxxxxx> --- Documentation/devicetree/bindings/mmc/mmc.txt | 5 +++++ drivers/mmc/core/host.c | 3 +++ 2 files changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt index 438899e..0384fc3 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. diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 8be0df7..1eabdd0 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -400,6 +400,9 @@ int mmc_of_parse(struct mmc_host *host) else if (ret != -ENOENT) return ret; + if (of_property_read_bool(np, "disable-wp")) + host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT; + /* See the comment on CD inversion above */ if (ro_cap_invert ^ ro_gpio_invert) host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
