1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
7 #ifndef __GENERIC_PHY_H
8 #define __GENERIC_PHY_H
12 * struct phy - A handle to (allowing control of) a single phy port.
14 * Clients provide storage for phy handles. The content of the structure is
15 * managed solely by the PHY API and PHY drivers. A phy struct is
16 * initialized by "get"ing the phy struct. The phy struct is passed to all
17 * other phy APIs to identify which PHY port to operate upon.
19 * @dev: The device which implements the PHY port.
20 * @id: The PHY ID within the provider.
29 * struct udevice_ops - set of function pointers for phy operations
30 * @init: operation to be performed for initializing phy (optional)
31 * @exit: operation to be performed while exiting (optional)
32 * @reset: reset the phy (optional).
33 * @power_on: powering on the phy (optional)
34 * @power_off: powering off the phy (optional)
38 * of_xlate - Translate a client's device-tree (OF) phy specifier.
40 * The PHY core calls this function as the first step in implementing
41 * a client's generic_phy_get_by_*() call.
43 * If this function pointer is set to NULL, the PHY core will use a
44 * default implementation, which assumes #phy-cells = <0> or
45 * #phy-cells = <1>, and in the later case that the DT cell
46 * contains a simple integer PHY port ID.
48 * @phy: The phy struct to hold the translation result.
49 * @args: The phy specifier values from device tree.
50 * @return 0 if OK, or a negative error code.
52 int (*of_xlate)(struct phy *phy, struct ofnode_phandle_args *args);
55 * init - initialize the hardware.
57 * Hardware intialization should not be done in during probe() but
58 * should be implemented in this init() function. It could be starting
59 * PLL, taking a controller out of reset, routing, etc. This function
60 * is typically called only once per PHY port.
61 * If power_on() is not implemented, it must power up the phy.
63 * @phy: the PHY port to initialize
64 * @return 0 if OK, or a negative error code.
66 int (*init)(struct phy *phy);
69 * exit - de-initialize the PHY device
71 * Hardware de-intialization should be done here. Every step done in
72 * init() should be undone here.
73 * This could be used to suspend the phy to reduce power consumption or
74 * to put the phy in a known condition before booting the OS (though it
75 * is NOT called automatically before booting the OS)
76 * If power_off() is not implemented, it must power down the phy.
78 * @phy: PHY port to be de-initialized
79 * @return 0 if OK, or a negative error code
81 int (*exit)(struct phy *phy);
84 * reset - resets a PHY device without shutting down
86 * @phy: PHY port to be reset
88 * During runtime, the PHY may need to be reset in order to
89 * re-establish connection etc without being shut down or exit.
91 * @return 0 if OK, or a negative error code
93 int (*reset)(struct phy *phy);
96 * power_on - power on a PHY device
98 * @phy: PHY port to be powered on
100 * During runtime, the PHY may need to be powered on or off several
101 * times. This function is used to power on the PHY. It relies on the
102 * setup done in init(). If init() is not implemented, it must take care
103 * of setting up the context (PLLs, ...)
105 * @return 0 if OK, or a negative error code
107 int (*power_on)(struct phy *phy);
110 * power_off - power off a PHY device
112 * @phy: PHY port to be powered off
114 * During runtime, the PHY may need to be powered on or off several
115 * times. This function is used to power off the PHY. Except if
116 * init()/deinit() are not implemented, it must not de-initialize
119 * @return 0 if OK, or a negative error code
121 int (*power_off)(struct phy *phy);
127 * generic_phy_init() - initialize the PHY port
129 * @phy: the PHY port to initialize
130 * @return 0 if OK, or a negative error code
132 int generic_phy_init(struct phy *phy);
135 * generic_phy_init() - de-initialize the PHY device
137 * @phy: PHY port to be de-initialized
138 * @return 0 if OK, or a negative error code
140 int generic_phy_exit(struct phy *phy);
143 * generic_phy_reset() - resets a PHY device without shutting down
145 * @phy: PHY port to be reset
146 *@return 0 if OK, or a negative error code
148 int generic_phy_reset(struct phy *phy);
151 * generic_phy_power_on() - power on a PHY device
153 * @phy: PHY port to be powered on
154 * @return 0 if OK, or a negative error code
156 int generic_phy_power_on(struct phy *phy);
159 * generic_phy_power_off() - power off a PHY device
161 * @phy: PHY port to be powered off
162 * @return 0 if OK, or a negative error code
164 int generic_phy_power_off(struct phy *phy);
168 * generic_phy_get_by_index() - Get a PHY device by integer index.
170 * @user: the client device
171 * @index: The index in the list of available PHYs
172 * @phy: A pointer to the PHY port
174 * This looks up a PHY device for a client device based on its position in the
175 * list of the possible PHYs.
178 * usb1: usb_otg_ss@xxx {
179 * compatible = "xxx";
183 * phys = <&usb2_phy>, <&usb3_phy>;
187 * the USB2 phy can be accessed by passing index '0' and the USB3 phy can
188 * be accessed by passing index '1'
190 * @return 0 if OK, or a negative error code
192 int generic_phy_get_by_index(struct udevice *user, int index,
196 * generic_phy_get_by_name() - Get a PHY device by its name.
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
202 * This looks up a PHY device for a client device in the
203 * list of the possible PHYs based on its name.
206 * usb1: usb_otg_ss@xxx {
207 * compatible = "xxx";
211 * phys = <&usb2_phy>, <&usb3_phy>;
212 * phy-names = "usb2phy", "usb3phy";
216 * the USB3 phy can be accessed using "usb3phy", and USB2 by using "usb2phy"
218 * @return 0 if OK, or a negative error code
220 int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
223 #else /* CONFIG_PHY */
225 static inline int generic_phy_init(struct phy *phy)
230 static inline int generic_phy_exit(struct phy *phy)
235 static inline int generic_phy_reset(struct phy *phy)
240 static inline int generic_phy_power_on(struct phy *phy)
245 static inline int generic_phy_power_off(struct phy *phy)
250 static inline int generic_phy_get_by_index(struct udevice *user, int index,
256 static inline int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
262 #endif /* CONFIG_PHY */
265 * generic_phy_valid() - check if PHY port is valid
267 * @phy: the PHY port to check
268 * @return TRUE if valid, or FALSE
270 static inline bool generic_phy_valid(struct phy *phy)
272 return phy->dev != NULL;
275 #endif /*__GENERIC_PHY_H */