[PATCH 2/2] mmc: sdhci: DT: Allow to specify that no write protect signal is present

[Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>]

Allow to specify in the device-tree that no physical write-protect signal
is connected to a particular instance of a SDHCI controller. This allows a
driver to ignore potential bogus values of the SDHCI_WRITE_PROTECT bit in
the SDHCI_PRESENT_STATE register if it is aware that no write-protect
signal is connected.

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-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Cc: Ian Campbell <ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>
Cc: Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 Documentation/devicetree/bindings/mmc/mmc.txt | 1 +
 drivers/mmc/host/sdhci-pltfm.c                | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 438899e..b068549 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -21,6 +21,7 @@ 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
 - 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/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index a207f5a..aa4d343 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -86,6 +86,9 @@ void sdhci_get_of_property(struct platform_device *pdev)
 	if (sdhci_of_wp_inverted(np))
 		host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 
+	if (of_property_read_bool(np, "disable-wp"))
+		host->quirks2 |= SDHCI_QUIRK2_DISABLE_WRITE_PROTECT;
+
 	if (of_get_property(np, "broken-cd", NULL))
 		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 
-- 
1.8.0

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