1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_RESET_CONTROLLER_H_ 3 #define _LINUX_RESET_CONTROLLER_H_ 4 5 #include <linux/list.h> 6 7 struct reset_controller_dev; 8 9 /** 10 * struct reset_control_ops - reset controller driver callbacks 11 * 12 * @reset: for self-deasserting resets, does all necessary 13 * things to reset the device 14 * @assert: manually assert the reset line, if supported 15 * @deassert: manually deassert the reset line, if supported 16 * @status: return the status of the reset line, if supported 17 */ 18 struct reset_control_ops { 19 int (*reset)(struct reset_controller_dev *rcdev, unsigned long id); 20 int (*assert)(struct reset_controller_dev *rcdev, unsigned long id); 21 int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id); 22 int (*status)(struct reset_controller_dev *rcdev, unsigned long id); 23 }; 24 25 struct module; 26 struct device_node; 27 struct of_phandle_args; 28 29 /** 30 * struct reset_controller_dev - reset controller entity that might 31 * provide multiple reset controls 32 * @ops: a pointer to device specific struct reset_control_ops 33 * @owner: kernel module of the reset controller driver 34 * @list: internal list of reset controller devices 35 * @reset_control_head: head of internal list of requested reset controls 36 * @of_node: corresponding device tree node as phandle target 37 * @of_reset_n_cells: number of cells in reset line specifiers 38 * @of_xlate: translation function to translate from specifier as found in the 39 * device tree to id as given to the reset control ops 40 * @nr_resets: number of reset controls in this reset controller device 41 */ 42 struct reset_controller_dev { 43 const struct reset_control_ops *ops; 44 struct module *owner; 45 struct list_head list; 46 struct list_head reset_control_head; 47 struct device_node *of_node; 48 int of_reset_n_cells; 49 int (*of_xlate)(struct reset_controller_dev *rcdev, 50 const struct of_phandle_args *reset_spec); 51 unsigned int nr_resets; 52 }; 53 54 int reset_controller_register(struct reset_controller_dev *rcdev); 55 void reset_controller_unregister(struct reset_controller_dev *rcdev); 56 57 struct device; 58 int devm_reset_controller_register(struct device *dev, 59 struct reset_controller_dev *rcdev); 60 61 #endif 62