ptp: use is_visible method to hide unused attributes
Instead of creating selected attributes after the device is created (and after userspace potentially seen uevent), lets use attribute group is_visible() method to control which attributes are shown. This will allow us to create all attributes (except "pins" group, which will be taken care of later) before userspace gets notified about new ptp class device. Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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