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由 Michael Welling 提交于
Occasionally the setup function will be called multiple times. Only request the gpio the first time otherwise -EBUSY will occur on subsequent calls to setup. Reported-by: NJoseph Bell <joe@iachieved.it> Signed-off-by: NMichael Welling <mwelling@ieee.org> Signed-off-by: NMark Brown <broonie@kernel.org>
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