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net: ethernet: ti: cpts: fix ethtool output when no ptp_clock registered
The CPTS driver registers PTP PHC clock when first netif is going up and unregister it when all netif are down. Now ethtool will show: - PTP PHC clock index 0 after boot until first netif is up; - the last assigned PTP PHC clock index even if PTP PHC clock is not registered any more after all netifs are down. This patch ensures that -1 is returned by ethtool when PTP PHC clock is not registered any more. Fixes: 8a2c9a5 ("net: ethernet: ti: cpts: rework initialization/deinitialization") Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Link: https://lore.kernel.org/r/20201224162405.28032-1-grygorii.strashko@ti.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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