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, struct ofnode_phandle_args *args);
  54
  55         /**
  56          * init - initialize the hardware.
  57          *
  58          * Hardware intialization should not be done in during probe() but
  59          * should be implemented in this init() function. It could be starting
  60          * PLL, taking a controller out of reset, routing, etc. This function
  61          * is typically called only once per PHY port.
  62          * If power_on() is not implemented, it must power up the phy.
  63          *
  64          * @phy:        the PHY port to initialize
  65          * @return 0 if OK, or a negative error code.
  66          */
  67         int     (*init)(struct phy *phy);
  68
  69         /**
  70         * exit - de-initialize the PHY device
  71         *
  72         * Hardware de-intialization should be done here. Every step done in
  73         * init() should be undone here.
  74         * This could be used to suspend the phy to reduce power consumption or
  75         * to put the phy in a known condition before booting the OS (though it
  76         * is NOT called automatically before booting the OS)
  77         * If power_off() is not implemented, it must power down the phy.
  78         *
  79         * @phy: PHY port to be de-initialized
  80         * @return 0 if OK, or a negative error code
  81         */
  82         int     (*exit)(struct phy *phy);
  83
  84         /**
  85         * reset - resets a PHY device without shutting down
  86         *
  87         * @phy: PHY port to be reset
  88         *
  89         * During runtime, the PHY may need to be reset in order to
  90         * re-establish connection etc without being shut down or exit.
  91         *
  92         * @return 0 if OK, or a negative error code
  93         */
  94         int     (*reset)(struct phy *phy);
  95
  96         /**
  97         * power_on - power on a PHY device
  98         *
  99         * @phy: PHY port to be powered on
 100         *
 101         * During runtime, the PHY may need to be powered on or off several
 102         * times. This function is used to power on the PHY. It relies on the
 103         * setup done in init(). If init() is not implemented, it must take care
 104         * of setting up the context (PLLs, ...)
 105         *
 106         * @return 0 if OK, or a negative error code
 107         */
 108         int     (*power_on)(struct phy *phy);
 109
 110         /**
 111         * power_off - power off a PHY device
 112         *
 113         * @phy: PHY port to be powered off
 114         *
 115         * During runtime, the PHY may need to be powered on or off several
 116         * times. This function is used to power off the PHY. Except if
 117         * init()/deinit() are not implemented, it must not de-initialize
 118         * everything.
 119         *
 120         * @return 0 if OK, or a negative error code
 121         */
 122         int     (*power_off)(struct phy *phy);
 123 };
 124
 125
 126 /**
 127  * generic_phy_init() - initialize the PHY port
 128  *
 129  * @phy:        the PHY port to initialize
 130  * @return 0 if OK, or a negative error code
 131  */
 132 int generic_phy_init(struct phy *phy);
 133
 134 /**
 135  * generic_phy_init() - de-initialize the PHY device
 136  *
 137  * @phy:        PHY port to be de-initialized
 138  * @return 0 if OK, or a negative error code
 139  */
 140 int generic_phy_exit(struct phy *phy);
 141
 142 /**
 143  * generic_phy_reset() - resets a PHY device without shutting down
 144  *
 145  * @phy:        PHY port to be reset
 146  *@return 0 if OK, or a negative error code
 147  */
 148 int generic_phy_reset(struct phy *phy);
 149
 150 /**
 151  * generic_phy_power_on() - power on a PHY device
 152  *
 153  * @phy:        PHY port to be powered on
 154  * @return 0 if OK, or a negative error code
 155  */
 156 int generic_phy_power_on(struct phy *phy);
 157
 158 /**
 159  * generic_phy_power_off() - power off a PHY device
 160  *
 161  * @phy:        PHY port to be powered off
 162  * @return 0 if OK, or a negative error code
 163  */
 164 int generic_phy_power_off(struct phy *phy);
 165
 166
 167 /**
 168  * generic_phy_get_by_index() - Get a PHY device by integer index.
 169  *
 170  * @user:       the client device
 171  * @index:      The index in the list of available PHYs
 172  * @phy:        A pointer to the PHY port
 173  *
 174  * This looks up a PHY device for a client device based on its position in the
 175  * list of the possible PHYs.
 176  *
 177  * example:
 178  * usb1: usb_otg_ss@xxx {
 179  *       compatible = "xxx";
 180  *       reg = <xxx>;
 181  *   .
 182  *   .
 183  *   phys = <&usb2_phy>, <&usb3_phy>;
 184  *   .
 185  *   .
 186  * };
 187  * the USB2 phy can be accessed by passing index '0' and the USB3 phy can
 188  * be accessed by passing index '1'
 189  *
 190  * @return 0 if OK, or a negative error code
 191  */
 192 int generic_phy_get_by_index(struct udevice *user, int index,
 193                              struct phy *phy);
 194
 195 /**
 196  * generic_phy_get_by_name() - Get a PHY device by its name.
 197  *
 198  * @user:       the client device
 199  * @phy_name:   The name of the PHY in the list of possible PHYs
 200  * @phy:        A pointer to the PHY port
 201  *
 202  * This looks up a PHY device for a client device in the
 203  * list of the possible PHYs based on its name.
 204  *
 205  * example:
 206  * usb1: usb_otg_ss@xxx {
 207  *       compatible = "xxx";
 208  *       reg = <xxx>;
 209  *   .
 210  *   .
 211  *   phys = <&usb2_phy>, <&usb3_phy>;
 212  *   phy-names = "usb2phy", "usb3phy";
 213  *   .
 214  *   .
 215  * };
 216  * the USB3 phy can be accessed using "usb3phy", and USB2 by using "usb2phy"
 217  *
 218  * @return 0 if OK, or a negative error code
 219  */
 220 int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
 221                             struct phy *phy);
 222
 223 #endif /*__GENERIC_PHY_H */