NFC: Make EN2 pin optional in the TRF7970A driver
Make the EN2 pin optional. This is useful for boards, which have this pin fix wired, for example to ground. Acked-by:Rob Herring <robh@kernel.org> Signed-off-by:
Guan Ben <ben.guan@cn.bosch.com> Signed-off-by:
Mark Jonas <mark.jonas@de.bosch.com> Signed-off-by:
Heiko Schocher <hs@denx.de> Signed-off-by:
Samuel Ortiz <sameo@linux.intel.com>
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