From 6c08df422ede7db94776b8099a5f43597629234c Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 2 Sep 2014 15:12:22 -0700 Subject: [PATCH] NFC: trf7970a: Disable SYS_CLK Output Currently, support for providing the external SYS_CLK signal on pin 27 is not supported so turn it off by writing to the 'Modulator and SYS_CLK Control' register immediately after reset. Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- drivers/nfc/trf7970a.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index 4709bea8deb2..9c0549d4f276 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -775,6 +775,12 @@ static int trf7970a_init(struct trf7970a *trf) if (ret) goto err_out; + ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 0); + if (ret) + goto err_out; + + trf->modulator_sys_clk_ctrl = 0; + /* Must clear NFC Target Detection Level reg due to erratum */ ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); if (ret)