doc: lpspi: Document DT bindings for LPSPI clocks

Add introductions of clocks and clock-names strings.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Clark Wang 2019-03-06 06:30:36 +00:00 • committed by Mark Brown
commit addb32866d
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