drivers/clk/clk-devres.c

   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 static int devm_clk_match(struct device *dev, void *res, void *data)
  74 {
  75         struct clk **c = res;
  76         if (!c || !*c) {
  77                 WARN_ON(!c || !*c);
  78                 return 0;
  79         }
  80         return *c == data;
  81 }
  82
  83 void devm_clk_put(struct device *dev, struct clk *clk)
  84 {
  85         int ret;
  86
  87         ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
  88
  89         WARN_ON(ret);
  90 }
  91 EXPORT_SYMBOL(devm_clk_put);
  92
  93 struct clk *devm_get_clk_from_child(struct device *dev,
  94                                     struct device_node *np, const char *con_id)
  95 {
  96         struct clk **ptr, *clk;
  97
  98         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
  99         if (!ptr)
 100                 return ERR_PTR(-ENOMEM);
 101
 102         clk = of_clk_get_by_name(np, con_id);
 103         if (!IS_ERR(clk)) {
 104                 *ptr = clk;
 105                 devres_add(dev, ptr);
 106         } else {
 107                 devres_free(ptr);
 108         }
 109
 110         return clk;
 111 }
 112 EXPORT_SYMBOL(devm_get_clk_from_child);