43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
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Time stamps from MII bus snooping devices
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This binding supports non-PHY devices that snoop the MII bus and
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provide time stamps. In contrast to PHY time stamping drivers (which
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can simply attach their interface directly to the PHY instance), stand
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alone MII time stamping drivers use this binding to specify the
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connection between the snooping device and a given network interface.
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Non-PHY MII time stamping drivers typically talk to the control
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interface over another bus like I2C, SPI, UART, or via a memory mapped
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peripheral. This controller device is associated with one or more
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time stamping channels, each of which snoops on a MII bus.
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The "timestamper" property lives in a phy node and links a time
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stamping channel from the controller device to that phy's MII bus.
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Example:
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tstamper: timestamper@10000000 {
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compatible = "ines,ptp-ctrl";
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reg = <0x10000000 0x80>;
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};
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ethernet@20000000 {
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mdio {
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ethernet-phy@1 {
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timestamper = <&tstamper 0>;
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};
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};
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};
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ethernet@30000000 {
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mdio {
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ethernet-phy@2 {
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timestamper = <&tstamper 1>;
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};
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};
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};
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In this example, time stamps from the MII bus attached to phy@1 will
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appear on time stamp channel 0 (zero), and those from phy@2 appear on
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channel 1.
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