drivers/clk/baikal-t1/ccu-rst.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2021 BAIKAL ELECTRONICS, JSC
   4  *
   5  * Baikal-T1 CCU Resets interface driver
   6  */
   7 #ifndef __CLK_BT1_CCU_RST_H__
   8 #define __CLK_BT1_CCU_RST_H__
   9
  10 #include <linux/of.h>
  11 #include <linux/regmap.h>
  12 #include <linux/reset-controller.h>
  13
  14 struct ccu_rst_info;
  15
  16 /*
  17  * enum ccu_rst_type - CCU Reset types
  18  * @CCU_RST_TRIG: Self-deasserted reset signal.
  19  * @CCU_RST_DIR: Directly controlled reset signal.
  20  */
  21 enum ccu_rst_type {
  22         CCU_RST_TRIG,
  23         CCU_RST_DIR,
  24 };
  25
  26 /*
  27  * struct ccu_rst_init_data - CCU Resets initialization data
  28  * @sys_regs: Baikal-T1 System Controller registers map.
  29  * @np: Pointer to the node with the System CCU block.
  30  */
  31 struct ccu_rst_init_data {
  32         struct regmap *sys_regs;
  33         struct device_node *np;
  34 };
  35
  36 /*
  37  * struct ccu_rst - CCU Reset descriptor
  38  * @rcdev: Reset controller descriptor.
  39  * @sys_regs: Baikal-T1 System Controller registers map.
  40  * @rsts_info: Reset flag info (base address and mask).
  41  */
  42 struct ccu_rst {
  43         struct reset_controller_dev rcdev;
  44         struct regmap *sys_regs;
  45         const struct ccu_rst_info *rsts_info;
  46 };
  47 #define to_ccu_rst(_rcdev) container_of(_rcdev, struct ccu_rst, rcdev)
  48
  49 #ifdef CONFIG_CLK_BT1_CCU_RST
  50
  51 struct ccu_rst *ccu_rst_hw_register(const struct ccu_rst_init_data *init);
  52
  53 void ccu_rst_hw_unregister(struct ccu_rst *rst);
  54
  55 #else
  56
  57 static inline
  58 struct ccu_rst *ccu_rst_hw_register(const struct ccu_rst_init_data *init)
  59 {
  60         return NULL;
  61 }
  62
  63 static inline void ccu_rst_hw_unregister(struct ccu_rst *rst) {}
  64
  65 #endif
  66
  67 #endif /* __CLK_BT1_CCU_RST_H__ */