Signed-off-by: Geoff Lansberry <geoff@xxxxxxxxx>
---
Documentation/devicetree/bindings/net/nfc/trf7970a.txt | 8 ++++++++
drivers/nfc/trf7970a.c | 11 ++++++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
index bf25f39..e605ebd 100644
--- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
+++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
@@ -19,9 +19,13 @@ Optional SoC Specific Properties:
"IRQ Status Read" erratum.
- en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF"
erratum.
+<<<<<<< HEAD
- 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.
+=======
+- vdd_io_1v8: Set to specify that the trf7970a io voltage should be set to 1.8V
+>>>>>>> e7ea4dd... NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage
- crystal_27mhz: Set to specify that the input frequency to the trf7970a is 27.12MHz
Example (for ARM-based BeagleBone with TRF7970A on SPI1):
@@ -45,7 +49,11 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1):
autosuspend-delay = <30000>;
irq-status-read-quirk;
en2-rf-quirk;
+<<<<<<< HEAD
t5t-rmb-extra-byte-quirk;
+=======
+ vdd_io_1v8;
+>>>>>>> e7ea4dd... NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage
crystal_27mhz;
status = "okay";
};
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 74210f9..be56897 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -441,6 +441,7 @@ struct trf7970a {
u8 iso_ctrl_tech;
u8 modulator_sys_clk_ctrl;
u8 special_fcn_reg1;
+ u8 io_ctrl;
unsigned int guard_time;
int technology;
int framing;
@@ -1064,6 +1065,11 @@ static int trf7970a_init(struct trf7970a *trf)
if (ret)
goto err_out;
+ ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
+ trf->io_ctrl|TRF7970A_REG_IO_CTRL_VRS(0x1));
+ if (ret)
+ goto err_out;
+
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
if (ret)
goto err_out;
@@ -1768,7 +1774,7 @@ static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
goto out_err;
ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
- TRF7970A_REG_IO_CTRL_VRS(0x1));
+ trf->io_ctrl|TRF7970A_REG_IO_CTRL_VRS(0x1));
if (ret)
goto out_err;
@@ -2075,6 +2081,9 @@ static int trf7970a_probe(struct spi_device *spi)
return ret;
}
+ if (of_property_read_bool(np, "vdd_io_1v8"))
+ trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
+
if (of_property_read_bool(np, "crystal_27MHz"))
trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ;
--
1.9.1
--
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