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net: phy: microchip: document where the LAN88xx PHYs are used

The driver uses the name LAN88xx for PHYs with phy_id = 0x0007c132. But
with this placeholder name no documentation can be found on the net.

Document the fact that these PHYs are build into the LAN7800 and LAN7850
USB/Ethernet controllers.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250515082051.2644450-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Oleksij Rempel and committed by
Jakub Kicinski 622b91e0 7b151e4e

+2
+2
drivers/net/phy/microchip.c
··· 474 474 /* This mask (0xfffffff2) is to differentiate from 475 475 * LAN8742 (phy_id 0x0007c130 and 0x0007c131) 476 476 * and allows future phy_id revisions. 477 + * These PHYs are integrated in LAN7800 and LAN7850 USB/Ethernet 478 + * controllers. 477 479 */ 478 480 .phy_id_mask = 0xfffffff2, 479 481 .name = "Microchip LAN88xx",