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NFC: trf7970a: Clear 'NFC Target Detection Level' register 

Due to a trf7970a erratum, the 'NFC Target Detection Level' register
(0x18) must be cleared after power-up.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
hifive-unleashed-5.1
Mark A. Greer 2014-03-25 08:54:31 -07:00 committed by Samuel Ortiz
parent 5876bc75e2
commit b887eb09d3
1 changed files with 5 additions and 0 deletions
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5
drivers/nfc/trf7970a.c
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@ -757,6 +757,11 @@ static int trf7970a_init(struct trf7970a *trf)
if (ret)
goto err_out;
/* Must clear NFC Target Detection Level reg due to erratum */
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
if (ret)
goto err_out;
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
TRF7970A_MODULATOR_DEPTH_OOK);
if (ret)