1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2 as 4 * published by the Free Software Foundation. 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/device.h> 9 #include <linux/export.h> 10 #include <linux/gfp.h> 11 12 static void devm_clk_release(struct device *dev, void *res) 13 { 14 clk_put(*(struct clk **)res); 15 } 16 17 struct clk *devm_clk_get(struct device *dev, const char *id) 18 { 19 struct clk **ptr, *clk; 20 21 ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); 22 if (!ptr) 23 return ERR_PTR(-ENOMEM); 24 25 clk = clk_get(dev, id); 26 if (!IS_ERR(clk)) { 27 *ptr = clk; 28 devres_add(dev, ptr); 29 } else { 30 devres_free(ptr); 31 } 32 33 return clk; 34 } 35 EXPORT_SYMBOL(devm_clk_get); 36 37 struct clk_bulk_devres { 38 struct clk_bulk_data *clks; 39 int num_clks; 40 }; 41 42 static void devm_clk_bulk_release(struct device *dev, void *res) 43 { 44 struct clk_bulk_devres *devres = res; 45 46 clk_bulk_put(devres->num_clks, devres->clks); 47 } 48 49 int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, 50 struct clk_bulk_data *clks) 51 { 52 struct clk_bulk_devres *devres; 53 int ret; 54 55 devres = devres_alloc(devm_clk_bulk_release, 56 sizeof(*devres), GFP_KERNEL); 57 if (!devres) 58 return -ENOMEM; 59 60 ret = clk_bulk_get(dev, num_clks, clks); 61 if (!ret) { 62 devres->clks = clks; 63 devres->num_clks = num_clks; 64 devres_add(dev, devres); 65 } else { 66 devres_free(devres); 67 } 68 69 return ret; 70 } 71 EXPORT_SYMBOL_GPL(devm_clk_bulk_get); 72 73 int __must_check devm_clk_bulk_get_all(struct device *dev, 74 struct clk_bulk_data **clks) 75 { 76 struct clk_bulk_devres *devres; 77 int ret; 78 79 devres = devres_alloc(devm_clk_bulk_release, 80 sizeof(*devres), GFP_KERNEL); 81 if (!devres) 82 return -ENOMEM; 83 84 ret = clk_bulk_get_all(dev, &devres->clks); 85 if (ret > 0) { 86 *clks = devres->clks; 87 devres->num_clks = ret; 88 devres_add(dev, devres); 89 } else { 90 devres_free(devres); 91 } 92 93 return ret; 94 } 95 EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all); 96 97 static int devm_clk_match(struct device *dev, void *res, void *data) 98 { 99 struct clk **c = res; 100 if (!c || !*c) { 101 WARN_ON(!c || !*c); 102 return 0; 103 } 104 return *c == data; 105 } 106 107 void devm_clk_put(struct device *dev, struct clk *clk) 108 { 109 int ret; 110 111 ret = devres_release(dev, devm_clk_release, devm_clk_match, clk); 112 113 WARN_ON(ret); 114 } 115 EXPORT_SYMBOL(devm_clk_put); 116 117 struct clk *devm_get_clk_from_child(struct device *dev, 118 struct device_node *np, const char *con_id) 119 { 120 struct clk **ptr, *clk; 121 122 ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); 123 if (!ptr) 124 return ERR_PTR(-ENOMEM); 125 126 clk = of_clk_get_by_name(np, con_id); 127 if (!IS_ERR(clk)) { 128 *ptr = clk; 129 devres_add(dev, ptr); 130 } else { 131 devres_free(ptr); 132 } 133 134 return clk; 135 } 136 EXPORT_SYMBOL(devm_get_clk_from_child); 137