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,cksel Timer reference clock source.
90 - fsl,tclk-period Timer reference clock period in nanoseconds.
91 - fsl,tmr-prsc Prescaler, divides the output clock.
92 - fsl,tmr-add Frequency compensation value.
93 - fsl,tmr-fiper1 Fixed interval period pulse generator.
94 - fsl,tmr-fiper2 Fixed interval period pulse generator.
95 - fsl,max-adj Maximum frequency adjustment in parts per billion.
97 These properties set the operational parameters for the PTP
98 clock. You must choose these carefully for the clock to work right.
99 Here is how to figure good values:
101 TimerOsc = selected reference clock MHz
102 tclk_period = desired clock period nanoseconds
103 NominalFreq = 1000 / tclk_period MHz
104 FreqDivRatio = TimerOsc / NominalFreq (must be greater that 1.0)
105 tmr_add = ceil(2^32 / FreqDivRatio)
106 OutputClock = NominalFreq / tmr_prsc MHz
107 PulseWidth = 1 / OutputClock microseconds
108 FiperFreq1 = desired frequency in Hz
109 FiperDiv1 = 1000000 * OutputClock / FiperFreq1
110 tmr_fiper1 = tmr_prsc * tclk_period * FiperDiv1 - tclk_period
111 max_adj = 1000000000 * (FreqDivRatio - 1.0) - 1
113 The calculation for tmr_fiper2 is the same as for tmr_fiper1. The
114 driver expects that tmr_fiper1 will be correctly set to produce a 1
115 Pulse Per Second (PPS) signal, since this will be offered to the PPS
116 subsystem to synchronize the Linux clock.
118 Reference clock source is determined by the value, which is holded
119 in CKSEL bits in TMR_CTRL register. "fsl,cksel" property keeps the
120 value, which will be directly written in those bits, that is why,
121 according to reference manual, the next clock sources can be used:
123 <0> - external high precision timer reference clock (TSEC_TMR_CLK
124 input is used for this purpose);
125 <1> - eTSEC system clock;
126 <2> - eTSEC1 transmit clock;
127 <3> - RTC clock input.
129 When this attribute is not used, eTSEC system clock will serve as
130 IEEE 1588 timer reference clock.
135 compatible = "fsl,etsec-ptp";
136 reg = <0x24E00 0xB0>;
137 interrupts = <12 0x8 13 0x8>;
138 interrupt-parent = < &ipic >;
140 fsl,tclk-period = <10>;
141 fsl,tmr-prsc = <100>;
142 fsl,tmr-add = <0x999999A4>;
143 fsl,tmr-fiper1 = <0x3B9AC9F6>;
144 fsl,tmr-fiper2 = <0x00018696>;
145 fsl,max-adj = <659999998>;