path: root/Documentation/devicetree/bindings/net/nfc
diff options
authorMark A. Greer <>2014-08-07 17:41:46 -0700
committerSamuel Ortiz <>2014-09-01 00:06:56 +0200
commit6afed0eb8c4158c99845f8d30cd5c3fd8e4855d9 (patch)
tree852fba64bf39af6c6f3ba2d075c801e710c9f57f /Documentation/devicetree/bindings/net/nfc
parent95064bd95a822659f4a606b485aba5009d70fc88 (diff)
NFC: trf7970a: Document the 'en2-rf-quirk' DT property
Current versions of the trf7970a have an erratum where the EN2 pin must be kept low. If it isn't kept low, it will generate an RF field even when in passive target mode. To work around this issue, create the 'en2-rf-quirk' device tree property to indicate that the trf7970a that the driver is using has this erratum. Signed-off-by: Mark A. Greer <> Signed-off-by: Samuel Ortiz <>
Diffstat (limited to 'Documentation/devicetree/bindings/net/nfc')
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
index 010e5c288801..7c89ca290ced 100644
--- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
+++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
@@ -16,6 +16,8 @@ Optional SoC Specific Properties:
- vin-voltage-override: Specify voltage of VIN pin in microvolts.
- irq-status-read-quirk: Specify that the trf7970a being used has the
"IRQ Status Read" erratum.
+- en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF"
+ erratum.
Example (for ARM-based BeagleBone with TRF7970A on SPI1):
@@ -36,6 +38,7 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1):
vin-voltage-override = <5000000>;
autosuspend-delay = <30000>;
+ en2-rf-quirk;
status = "okay";