[PATCH 2/3] NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage
From: Geoff Lansberry <hidden>
Date: 2016-12-15 22:31:00
Also in:
linux-wireless, lkml, netdev
Subsystem:
networking drivers, nfc subsystem, open firmware and flattened device tree bindings, the rest, ti trf7970a nfc driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Heidelberg, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds, Mark Greer
From: Geoff Lansberry <redacted> --- Documentation/devicetree/bindings/net/nfc/trf7970a.txt | 2 ++ drivers/nfc/trf7970a.c | 13 ++++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
index 9dda879..208f045 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. +- vdd_io_1v8: Set to specify that the trf7970a io voltage should be set to 1.8V - crystal_27mhz: Set to specify that the input frequency to the trf7970a is 27.12MHz
@@ -45,6 +46,7 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): irq-status-read-quirk; en2-rf-quirk; t5t-rmb-extra-byte-quirk; + vdd_io_1v8; crystal_27mhz; status = "okay"; };
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 2d2a077..b4c37ab 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;
@@ -1048,6 +1049,11 @@ 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;
@@ -1764,7 +1770,7 @@ 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;
@@ -2058,6 +2064,11 @@ 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; + dev_dbg(trf->dev, "trf7970a config vdd_io_1v8\n"); + } + if (of_property_read_bool(np, "crystal_27mhz")) { trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; dev_dbg(trf->dev, "trf7970a configure crystal_27mhz\n");
--
Signed-off-by: Geoff Lansberry <geoff-R+k406RtEhcAvxtiuMwx3w@public.gmane.org>
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