timestamper.txt (1234B)
1Time stamps from MII bus snooping devices 2 3This binding supports non-PHY devices that snoop the MII bus and 4provide time stamps. In contrast to PHY time stamping drivers (which 5can simply attach their interface directly to the PHY instance), stand 6alone MII time stamping drivers use this binding to specify the 7connection between the snooping device and a given network interface. 8 9Non-PHY MII time stamping drivers typically talk to the control 10interface over another bus like I2C, SPI, UART, or via a memory mapped 11peripheral. This controller device is associated with one or more 12time stamping channels, each of which snoops on a MII bus. 13 14The "timestamper" property lives in a phy node and links a time 15stamping channel from the controller device to that phy's MII bus. 16 17Example: 18 19 tstamper: timestamper@10000000 { 20 compatible = "ines,ptp-ctrl"; 21 reg = <0x10000000 0x80>; 22 }; 23 24 ethernet@20000000 { 25 mdio { 26 ethernet-phy@1 { 27 timestamper = <&tstamper 0>; 28 }; 29 }; 30 }; 31 32 ethernet@30000000 { 33 mdio { 34 ethernet-phy@2 { 35 timestamper = <&tstamper 1>; 36 }; 37 }; 38 }; 39 40In this example, time stamps from the MII bus attached to phy@1 will 41appear on time stamp channel 0 (zero), and those from phy@2 appear on 42channel 1.