include/generic-phy.h

   1 /*
   2  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   3  * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef __GENERIC_PHY_H
   9 #define __GENERIC_PHY_H
  10
  11
  12 /**
  13  * struct phy - A handle to (allowing control of) a single phy port.
  14  *
  15  * Clients provide storage for phy handles. The content of the structure is
  16  * managed solely by the PHY API and PHY drivers. A phy struct is
  17  * initialized by "get"ing the phy struct. The phy struct is passed to all
  18  * other phy APIs to identify which PHY port to operate upon.
  19  *
  20  * @dev: The device which implements the PHY port.
  21  * @id: The PHY ID within the provider.
  22  *
  23  */
  24 struct phy {
  25         struct udevice *dev;
  26         unsigned long id;
  27 };
  28
  29 /*
  30  * struct udevice_ops - set of function pointers for phy operations
  31  * @init: operation to be performed for initializing phy (optional)
  32  * @exit: operation to be performed while exiting (optional)
  33  * @reset: reset the phy (optional).
  34  * @power_on: powering on the phy (optional)
  35  * @power_off: powering off the phy (optional)
  36  */
  37 struct phy_ops {
  38         /**
  39          * of_xlate - Translate a client's device-tree (OF) phy specifier.
  40          *
  41          * The PHY core calls this function as the first step in implementing
  42          * a client's generic_phy_get_by_*() call.
  43          *
  44          * If this function pointer is set to NULL, the PHY core will use a
  45          * default implementation, which assumes #phy-cells = <0> or
  46          * #phy-cells = <1>, and in the later case that the DT cell
  47          * contains a simple integer PHY port ID.
  48          *
  49          * @phy:        The phy struct to hold the translation result.
  50          * @args:       The phy specifier values from device tree.
  51          * @return 0 if OK, or a negative error code.
  52          */
  53         int     (*of_xlate)(struct phy *phy,
  54                         struct fdtdec_phandle_args *args);
  55
  56         /**
  57          * init - initialize the hardware.
  58          *
  59          * Hardware intialization should not be done in during probe() but
  60          * should be implemented in this init() function. It could be starting
  61          * PLL, taking a controller out of reset, routing, etc. This function
  62          * is typically called only once per PHY port.
  63          * If power_on() is not implemented, it must power up the phy.
  64          *
  65          * @phy:        the PHY port to initialize
  66          * @return 0 if OK, or a negative error code.
  67          */
  68         int     (*init)(struct phy *phy);
  69
  70         /**
  71         * exit - de-initialize the PHY device
  72         *
  73         * Hardware de-intialization should be done here. Every step done in
  74         * init() should be undone here.
  75         * This could be used to suspend the phy to reduce power consumption or
  76         * to put the phy in a known condition before booting the OS (though it
  77         * is NOT called automatically before booting the OS)
  78         * If power_off() is not implemented, it must power down the phy.
  79         *
  80         * @phy: PHY port to be de-initialized
  81         * @return 0 if OK, or a negative error code
  82         */
  83         int     (*exit)(struct phy *phy);
  84
  85         /**
  86         * reset - resets a PHY device without shutting down
  87         *
  88         * @phy: PHY port to be reset
  89         *
  90         * During runtime, the PHY may need to be reset in order to
  91         * re-establish connection etc without being shut down or exit.
  92         *
  93         * @return 0 if OK, or a negative error code
  94         */
  95         int     (*reset)(struct phy *phy);
  96
  97         /**
  98         * power_on - power on a PHY device
  99         *
 100         * @phy: PHY port to be powered on
 101         *
 102         * During runtime, the PHY may need to be powered on or off several
 103         * times. This function is used to power on the PHY. It relies on the
 104         * setup done in init(). If init() is not implemented, it must take care
 105         * of setting up the context (PLLs, ...)
 106         *
 107         * @return 0 if OK, or a negative error code
 108         */
 109         int     (*power_on)(struct phy *phy);
 110
 111         /**
 112         * power_off - power off a PHY device
 113         *
 114         * @phy: PHY port to be powered off
 115         *
 116         * During runtime, the PHY may need to be powered on or off several
 117         * times. This function is used to power off the PHY. Except if
 118         * init()/deinit() are not implemented, it must not de-initialize
 119         * everything.
 120         *
 121         * @return 0 if OK, or a negative error code
 122         */
 123         int     (*power_off)(struct phy *phy);
 124 };
 125
 126
 127 /**
 128  * generic_phy_init() - initialize the PHY port
 129  *
 130  * @phy:        the PHY port to initialize
 131  * @return 0 if OK, or a negative error code
 132  */
 133 int generic_phy_init(struct phy *phy);
 134
 135 /**
 136  * generic_phy_init() - de-initialize the PHY device
 137  *
 138  * @phy:        PHY port to be de-initialized
 139  * @return 0 if OK, or a negative error code
 140  */
 141 int generic_phy_exit(struct phy *phy);
 142
 143 /**
 144  * generic_phy_reset() - resets a PHY device without shutting down
 145  *
 146  * @phy:        PHY port to be reset
 147  *@return 0 if OK, or a negative error code
 148  */
 149 int generic_phy_reset(struct phy *phy);
 150
 151 /**
 152  * generic_phy_power_on() - power on a PHY device
 153  *
 154  * @phy:        PHY port to be powered on
 155  * @return 0 if OK, or a negative error code
 156  */
 157 int generic_phy_power_on(struct phy *phy);
 158
 159 /**
 160  * generic_phy_power_off() - power off a PHY device
 161  *
 162  * @phy:        PHY port to be powered off
 163  * @return 0 if OK, or a negative error code
 164  */
 165 int generic_phy_power_off(struct phy *phy);
 166
 167
 168 /**
 169  * generic_phy_get_by_index() - Get a PHY device by integer index.
 170  *
 171  * @user:       the client device
 172  * @index:      The index in the list of available PHYs
 173  * @phy:        A pointer to the PHY port
 174  *
 175  * This looks up a PHY device for a client device based on its position in the
 176  * list of the possible PHYs.
 177  *
 178  * example:
 179  * usb1: usb_otg_ss@xxx {
 180  *       compatible = "xxx";
 181  *       reg = <xxx>;
 182  *   .
 183  *   .
 184  *   phys = <&usb2_phy>, <&usb3_phy>;
 185  *   .
 186  *   .
 187  * };
 188  * the USB2 phy can be accessed by passing index '0' and the USB3 phy can
 189  * be accessed by passing index '1'
 190  *
 191  * @return 0 if OK, or a negative error code
 192  */
 193 int generic_phy_get_by_index(struct udevice *user, int index,
 194                              struct phy *phy);
 195
 196 /**
 197  * generic_phy_get_by_name() - Get a PHY device by its name.
 198  *
 199  * @user:       the client device
 200  * @phy_name:   The name of the PHY in the list of possible PHYs
 201  * @phy:        A pointer to the PHY port
 202  *
 203  * This looks up a PHY device for a client device in the
 204  * list of the possible PHYs based on its name.
 205  *
 206  * example:
 207  * usb1: usb_otg_ss@xxx {
 208  *       compatible = "xxx";
 209  *       reg = <xxx>;
 210  *   .
 211  *   .
 212  *   phys = <&usb2_phy>, <&usb3_phy>;
 213  *   phy-names = "usb2phy", "usb3phy";
 214  *   .
 215  *   .
 216  * };
 217  * the USB3 phy can be accessed using "usb3phy", and USB2 by using "usb2phy"
 218  *
 219  * @return 0 if OK, or a negative error code
 220  */
 221 int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
 222                             struct phy *phy);
 223
 224 #endif /*__GENERIC_PHY_H */