pwm: sprd: Refuse requests with unsupported polarity
The driver only supports normal polarity and so should refuse requests for inversed polarity. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Chunyan Zhang <zhang.lyra@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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