[PATCH v4] NFC: trf7970a: Correct register settings for 27MHz clock

[Geoff Lansberry]

In prior commits the selected clock frequency does not propagate
correctly to what is written to the TRF7970A_MODULATOR_SYS_CLK_CTRL
register.

Signed-off-by: Geoff Lansberry <ge...@kuvee.com>
---
 drivers/nfc/trf7970a.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 6ed5d7e..f7fee7d 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -2067,6 +2067,13 @@ static int trf7970a_probe(struct spi_device *spi)
                return -EINVAL;
        }
 
+       if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) {
+               trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ;
+               dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n");
+       } else {
+               trf->modulator_sys_clk_ctrl = 0;
+       }
+
        ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
                                        trf7970a_irq,
                                        IRQF_TRIGGER_RISING | IRQF_ONESHOT,
-- 
2.7.4