pwm: sprd: Add Spreadtrum PWM support
This patch adds the Spreadtrum PWM support, which provides maximum 4 channels. Signed-off-by:Neo Hou <neo.hou@unisoc.com> Signed-off-by:
Baolin Wang <baolin.wang@linaro.org> Signed-off-by:
Thierry Reding <thierry.reding@gmail.com>
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