diff options
| author | Geoff Lansberry <geoff@kuvee.com> | 2016-12-21 23:18:32 -0500 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2017-04-05 11:03:47 +0200 |
| commit | 837eb4d21ecde7bde7a1fe523594fdf509055f3f (patch) | |
| tree | d0ec2d6e158ecc238c25beda6186f1c6b022d3b7 /Documentation/devicetree/bindings/net/nfc | |
| parent | 2891f2d5c13b7386331250d59920bdf8a54bfccb (diff) | |
NFC: trf7970a: add device tree option for 27MHz clock
The TRF7970A has configuration options to support hardware designs
which use a 27.12MHz clock. This commit adds a device tree option
'clock-frequency' to support configuring the this chip for default
13.56MHz clock or the optional 27.12MHz clock.
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Geoff Lansberry <geoff@kuvee.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'Documentation/devicetree/bindings/net/nfc')
| -rw-r--r-- | Documentation/devicetree/bindings/net/nfc/trf7970a.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt index 5889a3d133b2..1d186cd9817b 100644 --- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt +++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt @@ -21,6 +21,7 @@ Optional SoC Specific Properties: - t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum where an extra byte is returned by Read Multiple Block commands issued to Type 5 tags. +- clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz Example (for ARM-based BeagleBone with TRF7970A on SPI1): @@ -43,6 +44,7 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): irq-status-read-quirk; en2-rf-quirk; t5t-rmb-extra-byte-quirk; + clock-frequency = <27120000>; status = "okay"; }; }; |