net: dsa: microchip: Do not execute PTP driver code for unsupported switches

net: dsa: microchip: Do not execute PTP driver code for unsupported switches

[ Upstream commit 6ed3472173c575cd8aaed6c62eb74f7728404ee6 ]

The PTP driver code only works for certain KSZ switches like KSZ9477,
KSZ9567, LAN937X and their varieties.  This code is enabled by kernel
configuration CONFIG_NET_DSA_MICROCHIP_KSZ_PTP.  As the DSA driver is
common to work with all KSZ switches this PTP code is not appropriate
for other unsupported switches.  The ptp_capable indication is added to
the chip data structure to signal whether to execute those code.

Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
Link: https://patch.msgid.link/20241218020240.70601-1-Tristram.Ha@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 0f80e21bf622 ("net: dsa: microchip: Free previously initialized ports on init failures")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>