linux-kernel - [PATCH v2] NFC: trf7970a: Correct register settings for 27MHz clock

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Date:   Wed, 26 Apr 2017 21:41:48 -0400
From:   Geoff Lansberry <geoff@...ee.com>
To:     linux-wireless@...r.kernel.org, sameo@...ux.intel.com
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfc@...ts.01.org, devicetree@...r.kernel.org,
        mgreer@...malcreek.com, justin@...ee.com, colin.king@...onical.com,
        wharms@....de, Geoff Lansberry <geoff@...ee.com>
Subject: [PATCH v2] NFC: trf7970a: Correct register settings for 27MHz clock

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

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

diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 5f040e6..c278b0e 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -2079,6 +2079,13 @@ 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;
+	}
+
 	if (of_property_read_bool(np, "en2-rf-quirk"))
 		trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
 
-- 
2.7.4