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
10 #include <dm/ofnode.h>
12 struct ofnode_phandle_args;
15 * struct phy - A handle to (allowing control of) a single phy port.
17 * Clients provide storage for phy handles. The content of the structure is
18 * managed solely by the PHY API and PHY drivers. A phy struct is
19 * initialized by "get"ing the phy struct. The phy struct is passed to all
20 * other phy APIs to identify which PHY port to operate upon.
22 * @dev: The device which implements the PHY port.
23 * @id: The PHY ID within the provider.
32 * struct udevice_ops - set of function pointers for phy operations
33 * @init: operation to be performed for initializing phy (optional)
34 * @exit: operation to be performed while exiting (optional)
35 * @reset: reset the phy (optional).
36 * @power_on: powering on the phy (optional)
37 * @power_off: powering off the phy (optional)
41 * of_xlate - Translate a client's device-tree (OF) phy specifier.
43 * The PHY core calls this function as the first step in implementing
44 * a client's generic_phy_get_by_*() call.
46 * If this function pointer is set to NULL, the PHY core will use a
47 * default implementation, which assumes #phy-cells = <0> or
48 * #phy-cells = <1>, and in the later case that the DT cell
49 * contains a simple integer PHY port ID.
51 * @phy: The phy struct to hold the translation result.
52 * @args: The phy specifier values from device tree.
53 * @return 0 if OK, or a negative error code.
55 int (*of_xlate)(struct phy *phy, struct ofnode_phandle_args *args);
58 * init - initialize the hardware.
60 * Hardware intialization should not be done in during probe() but
61 * should be implemented in this init() function. It could be starting
62 * PLL, taking a controller out of reset, routing, etc. This function
63 * is typically called only once per PHY port.
64 * If power_on() is not implemented, it must power up the phy.
66 * @phy: the PHY port to initialize
67 * @return 0 if OK, or a negative error code.
69 int (*init)(struct phy *phy);
72 * exit - de-initialize the PHY device
74 * Hardware de-intialization should be done here. Every step done in
75 * init() should be undone here.
76 * This could be used to suspend the phy to reduce power consumption or
77 * to put the phy in a known condition before booting the OS (though it
78 * is NOT called automatically before booting the OS)
79 * If power_off() is not implemented, it must power down the phy.
81 * @phy: PHY port to be de-initialized
82 * @return 0 if OK, or a negative error code
84 int (*exit)(struct phy *phy);
87 * reset - resets a PHY device without shutting down
89 * @phy: PHY port to be reset
91 * During runtime, the PHY may need to be reset in order to
92 * re-establish connection etc without being shut down or exit.
94 * @return 0 if OK, or a negative error code
96 int (*reset)(struct phy *phy);
99 * power_on - power on a PHY device
101 * @phy: PHY port to be powered on
103 * During runtime, the PHY may need to be powered on or off several
104 * times. This function is used to power on the PHY. It relies on the
105 * setup done in init(). If init() is not implemented, it must take care
106 * of setting up the context (PLLs, ...)
108 * @return 0 if OK, or a negative error code
110 int (*power_on)(struct phy *phy);
113 * power_off - power off a PHY device
115 * @phy: PHY port to be powered off
117 * During runtime, the PHY may need to be powered on or off several
118 * times. This function is used to power off the PHY. Except if
119 * init()/deinit() are not implemented, it must not de-initialize
122 * @return 0 if OK, or a negative error code
124 int (*power_off)(struct phy *phy);
130 * generic_phy_init() - initialize the PHY port
132 * @phy: the PHY port to initialize
133 * @return 0 if OK, or a negative error code
135 int generic_phy_init(struct phy *phy);
138 * generic_phy_init() - de-initialize the PHY device
140 * @phy: PHY port to be de-initialized
141 * @return 0 if OK, or a negative error code
143 int generic_phy_exit(struct phy *phy);
146 * generic_phy_reset() - resets a PHY device without shutting down
148 * @phy: PHY port to be reset
149 *@return 0 if OK, or a negative error code
151 int generic_phy_reset(struct phy *phy);
154 * generic_phy_power_on() - power on a PHY device
156 * @phy: PHY port to be powered on
157 * @return 0 if OK, or a negative error code
159 int generic_phy_power_on(struct phy *phy);
162 * generic_phy_power_off() - power off a PHY device
164 * @phy: PHY port to be powered off
165 * @return 0 if OK, or a negative error code
167 int generic_phy_power_off(struct phy *phy);
171 * generic_phy_get_by_index() - Get a PHY device by integer index.
173 * @user: the client device
174 * @index: The index in the list of available PHYs
175 * @phy: A pointer to the PHY port
177 * This looks up a PHY device for a client device based on its position in the
178 * list of the possible PHYs.
181 * usb1: usb_otg_ss@xxx {
182 * compatible = "xxx";
186 * phys = <&usb2_phy>, <&usb3_phy>;
190 * the USB2 phy can be accessed by passing index '0' and the USB3 phy can
191 * be accessed by passing index '1'
193 * @return 0 if OK, or a negative error code
195 int generic_phy_get_by_index(struct udevice *user, int index,
199 * generic_phy_get_by_node() - Get a PHY device by integer index on ofnode
201 * @node: the device node
202 * @index: The index in the list of available PHYs
203 * @phy: A pointer to the PHY port
205 * This looks up a PHY device for a client device based on its ofnode and on
206 * its position in the list of the possible PHYs.
209 * usb1: usb_otg_ss@xxx {
210 * compatible = "xxx";
214 * phys = <&usb2_phy>, <&usb3_phy>;
218 * the USB2 phy can be accessed by passing index '0' and the USB3 phy can
219 * be accessed by passing index '1'
221 * @return 0 if OK, or a negative error code
223 int generic_phy_get_by_node(ofnode node, int index, struct phy *phy);
226 * generic_phy_get_by_name() - Get a PHY device by its name.
228 * @user: the client device
229 * @phy_name: The name of the PHY in the list of possible PHYs
230 * @phy: A pointer to the PHY port
232 * This looks up a PHY device for a client device in the
233 * list of the possible PHYs based on its name.
236 * usb1: usb_otg_ss@xxx {
237 * compatible = "xxx";
241 * phys = <&usb2_phy>, <&usb3_phy>;
242 * phy-names = "usb2phy", "usb3phy";
246 * the USB3 phy can be accessed using "usb3phy", and USB2 by using "usb2phy"
248 * @return 0 if OK, or a negative error code
250 int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
253 #else /* CONFIG_PHY */
255 static inline int generic_phy_init(struct phy *phy)
260 static inline int generic_phy_exit(struct phy *phy)
265 static inline int generic_phy_reset(struct phy *phy)
270 static inline int generic_phy_power_on(struct phy *phy)
275 static inline int generic_phy_power_off(struct phy *phy)
280 static inline int generic_phy_get_by_index(struct udevice *user, int index,
286 static inline int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
292 #endif /* CONFIG_PHY */
295 * generic_phy_valid() - check if PHY port is valid
297 * @phy: the PHY port to check
298 * @return TRUE if valid, or FALSE
300 static inline bool generic_phy_valid(struct phy *phy)
302 return phy && phy->dev;
305 #endif /*__GENERIC_PHY_H */