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 static int devm_clk_match(struct device *dev, void *res, void *data) 38 { 39 struct clk **c = res; 40 if (!c || !*c) { 41 WARN_ON(!c || !*c); 42 return 0; 43 } 44 return *c == data; 45 } 46 47 void devm_clk_put(struct device *dev, struct clk *clk) 48 { 49 int ret; 50 51 ret = devres_release(dev, devm_clk_release, devm_clk_match, clk); 52 53 WARN_ON(ret); 54 } 55 EXPORT_SYMBOL(devm_clk_put); 56 57 struct clk *devm_get_clk_from_child(struct device *dev, 58 struct device_node *np, const char *con_id) 59 { 60 struct clk **ptr, *clk; 61 62 ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); 63 if (!ptr) 64 return ERR_PTR(-ENOMEM); 65 66 clk = of_clk_get_by_name(np, con_id); 67 if (!IS_ERR(clk)) { 68 *ptr = clk; 69 devres_add(dev, ptr); 70 } else { 71 devres_free(ptr); 72 } 73 74 return clk; 75 } 76 EXPORT_SYMBOL(devm_get_clk_from_child); 77