1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/clk-provider.h> 8 #include <linux/regmap.h> 9 #include <linux/export.h> 10 11 #include "clk-regmap.h" 12 13 /** 14 * clk_is_enabled_regmap - standard is_enabled() for regmap users 15 * 16 * @hw: clk to operate on 17 * 18 * Clocks that use regmap for their register I/O can set the 19 * enable_reg and enable_mask fields in their struct clk_regmap and then use 20 * this as their is_enabled operation, saving some code. 21 */ 22 int clk_is_enabled_regmap(struct clk_hw *hw) 23 { 24 struct clk_regmap *rclk = to_clk_regmap(hw); 25 unsigned int val; 26 int ret; 27 28 ret = regmap_read(rclk->regmap, rclk->enable_reg, &val); 29 if (ret != 0) 30 return ret; 31 32 if (rclk->enable_is_inverted) 33 return (val & rclk->enable_mask) == 0; 34 else 35 return (val & rclk->enable_mask) != 0; 36 } 37 EXPORT_SYMBOL_GPL(clk_is_enabled_regmap); 38 39 /** 40 * clk_enable_regmap - standard enable() for regmap users 41 * 42 * @hw: clk to operate on 43 * 44 * Clocks that use regmap for their register I/O can set the 45 * enable_reg and enable_mask fields in their struct clk_regmap and then use 46 * this as their enable() operation, saving some code. 47 */ 48 int clk_enable_regmap(struct clk_hw *hw) 49 { 50 struct clk_regmap *rclk = to_clk_regmap(hw); 51 unsigned int val; 52 53 if (rclk->enable_is_inverted) 54 val = 0; 55 else 56 val = rclk->enable_mask; 57 58 return regmap_update_bits(rclk->regmap, rclk->enable_reg, 59 rclk->enable_mask, val); 60 } 61 EXPORT_SYMBOL_GPL(clk_enable_regmap); 62 63 /** 64 * clk_disable_regmap - standard disable() for regmap users 65 * 66 * @hw: clk to operate on 67 * 68 * Clocks that use regmap for their register I/O can set the 69 * enable_reg and enable_mask fields in their struct clk_regmap and then use 70 * this as their disable() operation, saving some code. 71 */ 72 void clk_disable_regmap(struct clk_hw *hw) 73 { 74 struct clk_regmap *rclk = to_clk_regmap(hw); 75 unsigned int val; 76 77 if (rclk->enable_is_inverted) 78 val = rclk->enable_mask; 79 else 80 val = 0; 81 82 regmap_update_bits(rclk->regmap, rclk->enable_reg, rclk->enable_mask, 83 val); 84 } 85 EXPORT_SYMBOL_GPL(clk_disable_regmap); 86 87 /** 88 * devm_clk_register_regmap - register a clk_regmap clock 89 * 90 * @dev: reference to the caller's device 91 * @rclk: clk to operate on 92 * 93 * Clocks that use regmap for their register I/O should register their 94 * clk_regmap struct via this function so that the regmap is initialized 95 * and so that the clock is registered with the common clock framework. 96 */ 97 int devm_clk_register_regmap(struct device *dev, struct clk_regmap *rclk) 98 { 99 if (dev && dev_get_regmap(dev, NULL)) 100 rclk->regmap = dev_get_regmap(dev, NULL); 101 else if (dev && dev->parent) 102 rclk->regmap = dev_get_regmap(dev->parent, NULL); 103 104 return devm_clk_hw_register(dev, &rclk->hw); 105 } 106 EXPORT_SYMBOL_GPL(devm_clk_register_regmap); 107