Documentation/devicetree/bindings/net/fsl-tsec-phy.txt

   1 * MDIO IO device
   2
   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.
   7
   8 Required properties:
   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"
  12
  13 Example:
  14
  15         mdio@24520 {
  16                 reg = <24520 20>;
  17                 compatible = "fsl,gianfar-mdio";
  18
  19                 ethernet-phy@0 {
  20                         ......
  21                 };
  22         };
  23
  24 * TBI Internal MDIO bus
  25
  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.
  32
  33 * Gianfar-compatible ethernet nodes
  34
  35 Properties:
  36
  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   - interrupts : For FEC devices, the first interrupt is the device's
  42     interrupt.  For TSEC and eTSEC devices, the first interrupt is
  43     transmit, the second is receive, and the third is error.
  44   - phy-handle : See ethernet.txt file in the same directory.
  45   - fixed-link : <a b c d e> where a is emulated phy id - choose any,
  46     but unique to the all specified fixed-links, b is duplex - 0 half,
  47     1 full, c is link speed - d#10/d#100/d#1000, d is pause - 0 no
  48     pause, 1 pause, e is asym_pause - 0 no asym_pause, 1 asym_pause.
  49   - phy-connection-type : See ethernet.txt file in the same directory.
  50     This property is only really needed if the connection is of type
  51     "rgmii-id", as all other connection types are detected by hardware.
  52   - fsl,magic-packet : If present, indicates that the hardware supports
  53     waking up via magic packet.
  54   - bd-stash : If present, indicates that the hardware supports stashing
  55     buffer descriptors in the L2.
  56   - rx-stash-len : Denotes the number of bytes of a received buffer to stash
  57     in the L2.
  58   - rx-stash-idx : Denotes the index of the first byte from the received
  59     buffer to stash in the L2.
  60
  61 Example:
  62         ethernet@24000 {
  63                 device_type = "network";
  64                 model = "TSEC";
  65                 compatible = "gianfar";
  66                 reg = <0x24000 0x1000>;
  67                 local-mac-address = [ 00 E0 0C 00 73 00 ];
  68                 interrupts = <29 2 30 2 34 2>;
  69                 interrupt-parent = <&mpic>;
  70                 phy-handle = <&phy0>
  71         };
  72
  73 * Gianfar PTP clock nodes
  74
  75 General Properties:
  76
  77   - compatible   Should be "fsl,etsec-ptp"
  78   - reg          Offset and length of the register set for the device
  79   - interrupts   There should be at least two interrupts. Some devices
  80                  have as many as four PTP related interrupts.
  81
  82 Clock Properties:
  83
  84   - fsl,cksel        Timer reference clock source.
  85   - fsl,tclk-period  Timer reference clock period in nanoseconds.
  86   - fsl,tmr-prsc     Prescaler, divides the output clock.
  87   - fsl,tmr-add      Frequency compensation value.
  88   - fsl,tmr-fiper1   Fixed interval period pulse generator.
  89   - fsl,tmr-fiper2   Fixed interval period pulse generator.
  90   - fsl,max-adj      Maximum frequency adjustment in parts per billion.
  91
  92   These properties set the operational parameters for the PTP
  93   clock. You must choose these carefully for the clock to work right.
  94   Here is how to figure good values:
  95
  96   TimerOsc     = selected reference clock   MHz
  97   tclk_period  = desired clock period       nanoseconds
  98   NominalFreq  = 1000 / tclk_period         MHz
  99   FreqDivRatio = TimerOsc / NominalFreq     (must be greater that 1.0)
 100   tmr_add      = ceil(2^32 / FreqDivRatio)
 101   OutputClock  = NominalFreq / tmr_prsc     MHz
 102   PulseWidth   = 1 / OutputClock            microseconds
 103   FiperFreq1   = desired frequency in Hz
 104   FiperDiv1    = 1000000 * OutputClock / FiperFreq1
 105   tmr_fiper1   = tmr_prsc * tclk_period * FiperDiv1 - tclk_period
 106   max_adj      = 1000000000 * (FreqDivRatio - 1.0) - 1
 107
 108   The calculation for tmr_fiper2 is the same as for tmr_fiper1. The
 109   driver expects that tmr_fiper1 will be correctly set to produce a 1
 110   Pulse Per Second (PPS) signal, since this will be offered to the PPS
 111   subsystem to synchronize the Linux clock.
 112
 113   Reference clock source is determined by the value, which is holded
 114   in CKSEL bits in TMR_CTRL register. "fsl,cksel" property keeps the
 115   value, which will be directly written in those bits, that is why,
 116   according to reference manual, the next clock sources can be used:
 117
 118   <0> - external high precision timer reference clock (TSEC_TMR_CLK
 119         input is used for this purpose);
 120   <1> - eTSEC system clock;
 121   <2> - eTSEC1 transmit clock;
 122   <3> - RTC clock input.
 123
 124   When this attribute is not used, eTSEC system clock will serve as
 125   IEEE 1588 timer reference clock.
 126
 127 Example:
 128
 129         ptp_clock@24E00 {
 130                 compatible = "fsl,etsec-ptp";
 131                 reg = <0x24E00 0xB0>;
 132                 interrupts = <12 0x8 13 0x8>;
 133                 interrupt-parent = < &ipic >;
 134                 fsl,cksel       = <1>;
 135                 fsl,tclk-period = <10>;
 136                 fsl,tmr-prsc    = <100>;
 137                 fsl,tmr-add     = <0x999999A4>;
 138                 fsl,tmr-fiper1  = <0x3B9AC9F6>;
 139                 fsl,tmr-fiper2  = <0x00018696>;
 140                 fsl,max-adj     = <659999998>;
 141         };