In pwm_ops there are a few callbacks that are not supposed to be used by
new drivers. Group them at the end of the structure and add a comment.
Similarily for struct pwm_chip group the members that drivers shouldn't
care about at the end and mark them as internal with another comment.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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