Why does RTL8211E Gigabit Ethernet hardware not support PTP not supported by HW?

Why does RTL8211E Gigabit Ethernet hardware not support PTP not supported by HW

[ 3023.406479] pppoe-wan: renamed from ppp0
[ 3430.816277] kmodloader: loading kernel modules from /etc/modules.d/*
[ 3430.820039] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 3446.958141] kmodloader: loading kernel modules from /etc/modules.d/*
[ 3446.962357] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 3475.690417] br-lan: port 1(eth1) entered disabled state
[ 3475.696087] device eth1 left promiscuous mode
[ 3475.696743] br-lan: port 1(eth1) entered disabled state
[ 3476.078801] rk_gmac-dwmac ff540000.ethernet eth0: Link is Down
[ 3477.350005] br-lan: port 1(eth1) entered blocking state
[ 3477.350511] br-lan: port 1(eth1) entered disabled state
[ 3477.351354] device eth1 entered promiscuous mode
[ 3477.353472] br-lan: port 1(eth1) entered blocking state
[ 3477.353988] br-lan: port 1(eth1) entered forwarding state
[ 3477.362719] r8152 5-1:1.0 eth1: Promiscuous mode enabled
[ 3477.363909] r8152 5-1:1.0 eth1: carrier on
[ 3477.372218] rk_gmac-dwmac ff540000.ethernet eth0: PHY [stmmac-0:00] driver [RTL8211E Gigabit Ethernet]
[ 3477.384846] rk_gmac-dwmac ff540000.ethernet eth0: No Safety Features support found
[ 3477.385607] rk_gmac-dwmac ff540000.ethernet eth0: PTP not supported by HW
[ 3477.386243] rk_gmac-dwmac ff540000.ethernet eth0: configuring for phy/rgmii link mode
[ 3482.509338] rk_gmac-dwmac ff540000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
[ 3482.510205] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 3482.511698] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.3961: link becomes ready
[ 3482.679353] pppoe-wan: renamed from ppp0
[    0.366646] libphy: Fixed MDIO Bus: probed
[    0.368453] rk_gmac-dwmac ff540000.ethernet: IRQ eth_wake_irq not found
[    0.369072] rk_gmac-dwmac ff540000.ethernet: IRQ eth_lpi not found
[    0.369785] rk_gmac-dwmac ff540000.ethernet: PTP uses main clock
[    0.370453] rk_gmac-dwmac ff540000.ethernet: clock input or output? (input).
[    0.371158] rk_gmac-dwmac ff540000.ethernet: TX delay(0x24).
[    0.371679] rk_gmac-dwmac ff540000.ethernet: RX delay(0x18).
[    0.372206] rk_gmac-dwmac ff540000.ethernet: integrated PHY? (no).
[    0.372832] rk_gmac-dwmac ff540000.ethernet: cannot get clock clk_mac_speed
[    0.373461] rk_gmac-dwmac ff540000.ethernet: clock input from PHY
[    0.379044] rk_gmac-dwmac ff540000.ethernet: init for RGMII
[    0.379883] rk_gmac-dwmac ff540000.ethernet: User ID: 0x10, Synopsys ID: 0x35
[    0.380543] rk_gmac-dwmac ff540000.ethernet: 	DWMAC1000
[    0.381023] rk_gmac-dwmac ff540000.ethernet: DMA HW capability register supported
[    0.381703] rk_gmac-dwmac ff540000.ethernet: RX Checksum Offload Engine supported
[    0.382380] rk_gmac-dwmac ff540000.ethernet: COE Type 2
[    0.382856] rk_gmac-dwmac ff540000.ethernet: TX Checksum insertion supported
[    0.383538] rk_gmac-dwmac ff540000.ethernet: Wake-Up On Lan supported
[    0.384125] rk_gmac-dwmac ff540000.ethernet: Normal descriptors
[    0.384663] rk_gmac-dwmac ff540000.ethernet: Ring mode enabled
[    0.385194] rk_gmac-dwmac ff540000.ethernet: Enable RX Mitigation via HW Watchdog Timer

PTP = Precision Time Protocol? When is it used? I noticed some Intel ethernet drivers depend on kmod-ptp anyway. https://en.wikipedia.org/wiki/Precision_Time_Protocol

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