3 The MDIO is a bus to which the PHY devices are connected. For each
4 device that exists on this bus, a child node should be created. See
5 the definition of the PHY node in booting-without-of.txt for an example
6 of how to define a PHY.
9 - reg : Offset and length of the register set for the device
10 - compatible : Should define the compatible device type for the
11 mdio. Currently, this is most likely to be "fsl,gianfar-mdio"
17 compatible = "fsl,gianfar-mdio";
24 * TBI Internal MDIO bus
26 As of this writing, every tsec is associated with an internal TBI PHY.
27 This PHY is accessed through the local MDIO bus. These buses are defined
28 similarly to the mdio buses, except they are compatible with "fsl,gianfar-tbi".
29 The TBI PHYs underneath them are similar to normal PHYs, but the reg property
30 is considered instructive, rather than descriptive. The reg property should
31 be chosen so it doesn't interfere with other PHYs on the bus.
33 * Gianfar-compatible ethernet nodes
37 - device_type : Should be "network"
38 - model : Model of the device. Can be "TSEC", "eTSEC", or "FEC"
39 - compatible : Should be "gianfar"
40 - reg : Offset and length of the register set for the device
41 - local-mac-address : List of bytes representing the ethernet address of
43 - interrupts : For FEC devices, the first interrupt is the device's
44 interrupt. For TSEC and eTSEC devices, the first interrupt is
45 transmit, the second is receive, and the third is error.
46 - phy-handle : The phandle for the PHY connected to this ethernet
48 - fixed-link : <a b c d e> where a is emulated phy id - choose any,
49 but unique to the all specified fixed-links, b is duplex - 0 half,
50 1 full, c is link speed - d#10/d#100/d#1000, d is pause - 0 no
51 pause, 1 pause, e is asym_pause - 0 no asym_pause, 1 asym_pause.
52 - phy-connection-type : a string naming the controller/PHY interface type,
53 i.e., "mii" (default), "rmii", "gmii", "rgmii", "rgmii-id", "sgmii",
54 "tbi", or "rtbi". This property is only really needed if the connection
55 is of type "rgmii-id", as all other connection types are detected by
57 - fsl,magic-packet : If present, indicates that the hardware supports
58 waking up via magic packet.
59 - bd-stash : If present, indicates that the hardware supports stashing
60 buffer descriptors in the L2.
61 - rx-stash-len : Denotes the number of bytes of a received buffer to stash
63 - rx-stash-idx : Denotes the index of the first byte from the received
64 buffer to stash in the L2.
68 device_type = "network";
70 compatible = "gianfar";
71 reg = <0x24000 0x1000>;
72 local-mac-address = [ 00 E0 0C 00 73 00 ];
73 interrupts = <29 2 30 2 34 2>;
74 interrupt-parent = <&mpic>;
78 * Gianfar PTP clock nodes
82 - compatible Should be "fsl,etsec-ptp"
83 - reg Offset and length of the register set for the device
84 - interrupts There should be at least two interrupts. Some devices
85 have as many as four PTP related interrupts.
89 - fsl,tclk-period Timer reference clock period in nanoseconds.
90 - fsl,tmr-prsc Prescaler, divides the output clock.
91 - fsl,tmr-add Frequency compensation value.
92 - fsl,tmr-fiper1 Fixed interval period pulse generator.
93 - fsl,tmr-fiper2 Fixed interval period pulse generator.
94 - fsl,max-adj Maximum frequency adjustment in parts per billion.
96 These properties set the operational parameters for the PTP
97 clock. You must choose these carefully for the clock to work right.
98 Here is how to figure good values:
100 TimerOsc = system clock MHz
101 tclk_period = desired clock period nanoseconds
102 NominalFreq = 1000 / tclk_period MHz
103 FreqDivRatio = TimerOsc / NominalFreq (must be greater that 1.0)
104 tmr_add = ceil(2^32 / FreqDivRatio)
105 OutputClock = NominalFreq / tmr_prsc MHz
106 PulseWidth = 1 / OutputClock microseconds
107 FiperFreq1 = desired frequency in Hz
108 FiperDiv1 = 1000000 * OutputClock / FiperFreq1
109 tmr_fiper1 = tmr_prsc * tclk_period * FiperDiv1 - tclk_period
110 max_adj = 1000000000 * (FreqDivRatio - 1.0) - 1
112 The calculation for tmr_fiper2 is the same as for tmr_fiper1. The
113 driver expects that tmr_fiper1 will be correctly set to produce a 1
114 Pulse Per Second (PPS) signal, since this will be offered to the PPS
115 subsystem to synchronize the Linux clock.
120 compatible = "fsl,etsec-ptp";
121 reg = <0x24E00 0xB0>;
122 interrupts = <12 0x8 13 0x8>;
123 interrupt-parent = < &ipic >;
124 fsl,tclk-period = <10>;
125 fsl,tmr-prsc = <100>;
126 fsl,tmr-add = <0x999999A4>;
127 fsl,tmr-fiper1 = <0x3B9AC9F6>;
128 fsl,tmr-fiper2 = <0x00018696>;
129 fsl,max-adj = <659999998>;