| 1 |
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| 2 | #ifndef _LINUX_RESET_CONTROLLER_H_
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| 3 | #define _LINUX_RESET_CONTROLLER_H_
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| 4 |
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| 5 | #include <linux/list.h>
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| 6 |
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| 7 | struct reset_controller_dev;
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| 8 |
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| 9 | |
| 10 | * struct reset_control_ops - reset controller driver callbacks
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| 11 | *
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| 12 | * @reset: for self-deasserting resets, does all necessary
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| 13 | * things to reset the device
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| 14 | * @assert: manually assert the reset line, if supported
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| 15 | * @deassert: manually deassert the reset line, if supported
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| 16 | * @status: return the status of the reset line, if supported
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| 17 |
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| 18 | struct reset_control_ops {
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| 19 | int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
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| 20 | int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
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| 21 | int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
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| 22 | int (*status)(struct reset_controller_dev *rcdev, unsigned long id);
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| 23 | };
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| 24 |
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| 25 | struct module;
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| 26 | struct device_node;
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| 27 | struct of_phandle_args;
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| 28 |
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| 29 | |
| 30 | * struct reset_control_lookup - represents a single lookup entry
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| 31 | *
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| 32 | * @list: internal list of all reset lookup entries
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| 33 | * @provider: name of the reset controller device controlling this reset line
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| 34 | * @index: ID of the reset controller in the reset controller device
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| 35 | * @dev_id: name of the device associated with this reset line
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| 36 | * @con_id: name of the reset line (can be NULL)
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| 37 |
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| 38 | struct reset_control_lookup {
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| 39 | struct list_head list;
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| 40 | const char *provider;
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| 41 | unsigned int index;
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| 42 | const char *dev_id;
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| 43 | const char *con_id;
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| 44 | };
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| 45 |
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| 46 | #define RESET_LOOKUP(_provider, _index, _dev_id, _con_id) \
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| 47 | { \
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| 48 | .provider = _provider, \
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| 49 | .index = _index, \
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| 50 | .dev_id = _dev_id, \
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| 51 | .con_id = _con_id, \
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| 52 | }
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| 53 |
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| 54 | |
| 55 | * struct reset_controller_dev - reset controller entity that might
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| 56 | * provide multiple reset controls
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| 57 | * @ops: a pointer to device specific struct reset_control_ops
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| 58 | * @owner: kernel module of the reset controller driver
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| 59 | * @list: internal list of reset controller devices
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| 60 | * @reset_control_head: head of internal list of requested reset controls
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| 61 | * @dev: corresponding driver model device struct
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| 62 | * @of_node: corresponding device tree node as phandle target
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| 63 | * @of_reset_n_cells: number of cells in reset line specifiers
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| 64 | * @of_xlate: translation function to translate from specifier as found in the
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| 65 | * device tree to id as given to the reset control ops, defaults
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| 66 | * to :c:func:`of_reset_simple_xlate`.
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| 67 | * @nr_resets: number of reset controls in this reset controller device
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| 68 |
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| 69 | struct reset_controller_dev {
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| 70 | const struct reset_control_ops *ops;
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| 71 | struct module *owner;
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| 72 | struct list_head list;
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| 73 | struct list_head reset_control_head;
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| 74 | struct device *dev;
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| 75 | struct device_node *of_node;
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| 76 | int of_reset_n_cells;
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| 77 | int (*of_xlate)(struct reset_controller_dev *rcdev,
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| 78 | const struct of_phandle_args *reset_spec);
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| 79 | unsigned int nr_resets;
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| 80 | };
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| 81 |
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| 82 | int reset_controller_register(struct reset_controller_dev *rcdev);
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| 83 | void reset_controller_unregister(struct reset_controller_dev *rcdev);
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| 84 |
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| 85 | struct device;
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| 86 | int devm_reset_controller_register(struct device *dev,
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| 87 | struct reset_controller_dev *rcdev);
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| 88 |
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| 89 | void reset_controller_add_lookup(struct reset_control_lookup *lookup,
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| 90 | unsigned int num_entries);
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| 91 |
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| 92 | #endif
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