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NFC: trf7970a: Disable SYS_CLK Output

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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 <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark A. Greer 2014-09-02 15:12:22 -07:00 committed by Samuel Ortiz
parent 17b2151733
commit 6c08df422e
1 changed files with 6 additions and 0 deletions
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6
drivers/nfc/trf7970a.c
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@ -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)