drivers/clk/clk-devres.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/clk.h>
   3 #include <linux/device.h>
   4 #include <linux/export.h>
   5 #include <linux/gfp.h>
   6
   7 static void devm_clk_release(struct device *dev, void *res)
   8 {
   9         clk_put(*(struct clk **)res);
  10 }
  11
  12 struct clk *devm_clk_get(struct device *dev, const char *id)
  13 {
  14         struct clk **ptr, *clk;
  15
  16         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
  17         if (!ptr)
  18                 return ERR_PTR(-ENOMEM);
  19
  20         clk = clk_get(dev, id);
  21         if (!IS_ERR(clk)) {
  22                 *ptr = clk;
  23                 devres_add(dev, ptr);
  24         } else {
  25                 devres_free(ptr);
  26         }
  27
  28         return clk;
  29 }
  30 EXPORT_SYMBOL(devm_clk_get);
  31
  32 struct clk_bulk_devres {
  33         struct clk_bulk_data *clks;
  34         int num_clks;
  35 };
  36
  37 static void devm_clk_bulk_release(struct device *dev, void *res)
  38 {
  39         struct clk_bulk_devres *devres = res;
  40
  41         clk_bulk_put(devres->num_clks, devres->clks);
  42 }
  43
  44 int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
  45                       struct clk_bulk_data *clks)
  46 {
  47         struct clk_bulk_devres *devres;
  48         int ret;
  49
  50         devres = devres_alloc(devm_clk_bulk_release,
  51                               sizeof(*devres), GFP_KERNEL);
  52         if (!devres)
  53                 return -ENOMEM;
  54
  55         ret = clk_bulk_get(dev, num_clks, clks);
  56         if (!ret) {
  57                 devres->clks = clks;
  58                 devres->num_clks = num_clks;
  59                 devres_add(dev, devres);
  60         } else {
  61                 devres_free(devres);
  62         }
  63
  64         return ret;
  65 }
  66 EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
  67
  68 int __must_check devm_clk_bulk_get_all(struct device *dev,
  69                                        struct clk_bulk_data **clks)
  70 {
  71         struct clk_bulk_devres *devres;
  72         int ret;
  73
  74         devres = devres_alloc(devm_clk_bulk_release,
  75                               sizeof(*devres), GFP_KERNEL);
  76         if (!devres)
  77                 return -ENOMEM;
  78
  79         ret = clk_bulk_get_all(dev, &devres->clks);
  80         if (ret > 0) {
  81                 *clks = devres->clks;
  82                 devres->num_clks = ret;
  83                 devres_add(dev, devres);
  84         } else {
  85                 devres_free(devres);
  86         }
  87
  88         return ret;
  89 }
  90 EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
  91
  92 static int devm_clk_match(struct device *dev, void *res, void *data)
  93 {
  94         struct clk **c = res;
  95         if (!c || !*c) {
  96                 WARN_ON(!c || !*c);
  97                 return 0;
  98         }
  99         return *c == data;
 100 }
 101
 102 void devm_clk_put(struct device *dev, struct clk *clk)
 103 {
 104         int ret;
 105
 106         ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
 107
 108         WARN_ON(ret);
 109 }
 110 EXPORT_SYMBOL(devm_clk_put);
 111
 112 struct clk *devm_get_clk_from_child(struct device *dev,
 113                                     struct device_node *np, const char *con_id)
 114 {
 115         struct clk **ptr, *clk;
 116
 117         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
 118         if (!ptr)
 119                 return ERR_PTR(-ENOMEM);
 120
 121         clk = of_clk_get_by_name(np, con_id);
 122         if (!IS_ERR(clk)) {
 123                 *ptr = clk;
 124                 devres_add(dev, ptr);
 125         } else {
 126                 devres_free(ptr);
 127         }
 128
 129         return clk;
 130 }
 131 EXPORT_SYMBOL(devm_get_clk_from_child);