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 struct devm_clk_state {
   8         struct clk *clk;
   9         void (*exit)(struct clk *clk);
  10 };
  11
  12 static void devm_clk_release(struct device *dev, void *res)
  13 {
  14         struct devm_clk_state *state = res;
  15
  16         if (state->exit)
  17                 state->exit(state->clk);
  18
  19         clk_put(state->clk);
  20 }
  21
  22 static struct clk *__devm_clk_get(struct device *dev, const char *id,
  23                                   struct clk *(*get)(struct device *dev, const char *id),
  24                                   int (*init)(struct clk *clk),
  25                                   void (*exit)(struct clk *clk))
  26 {
  27         struct devm_clk_state *state;
  28         struct clk *clk;
  29         int ret;
  30
  31         state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL);
  32         if (!state)
  33                 return ERR_PTR(-ENOMEM);
  34
  35         clk = get(dev, id);
  36         if (IS_ERR(clk)) {
  37                 ret = PTR_ERR(clk);
  38                 goto err_clk_get;
  39         }
  40
  41         if (init) {
  42                 ret = init(clk);
  43                 if (ret)
  44                         goto err_clk_init;
  45         }
  46
  47         state->clk = clk;
  48         state->exit = exit;
  49
  50         devres_add(dev, state);
  51
  52         return clk;
  53
  54 err_clk_init:
  55
  56         clk_put(clk);
  57 err_clk_get:
  58
  59         devres_free(state);
  60         return ERR_PTR(ret);
  61 }
  62
  63 struct clk *devm_clk_get(struct device *dev, const char *id)
  64 {
  65         return __devm_clk_get(dev, id, clk_get, NULL, NULL);
  66 }
  67 EXPORT_SYMBOL(devm_clk_get);
  68
  69 struct clk *devm_clk_get_prepared(struct device *dev, const char *id)
  70 {
  71         return __devm_clk_get(dev, id, clk_get, clk_prepare, clk_unprepare);
  72 }
  73 EXPORT_SYMBOL_GPL(devm_clk_get_prepared);
  74
  75 struct clk *devm_clk_get_enabled(struct device *dev, const char *id)
  76 {
  77         return __devm_clk_get(dev, id, clk_get,
  78                               clk_prepare_enable, clk_disable_unprepare);
  79 }
  80 EXPORT_SYMBOL_GPL(devm_clk_get_enabled);
  81
  82 struct clk *devm_clk_get_optional(struct device *dev, const char *id)
  83 {
  84         return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL);
  85 }
  86 EXPORT_SYMBOL(devm_clk_get_optional);
  87
  88 struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id)
  89 {
  90         return __devm_clk_get(dev, id, clk_get_optional,
  91                               clk_prepare, clk_unprepare);
  92 }
  93 EXPORT_SYMBOL_GPL(devm_clk_get_optional_prepared);
  94
  95 struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id)
  96 {
  97         return __devm_clk_get(dev, id, clk_get_optional,
  98                               clk_prepare_enable, clk_disable_unprepare);
  99 }
 100 EXPORT_SYMBOL_GPL(devm_clk_get_optional_enabled);
 101
 102 struct clk_bulk_devres {
 103         struct clk_bulk_data *clks;
 104         int num_clks;
 105 };
 106
 107 static void devm_clk_bulk_release(struct device *dev, void *res)
 108 {
 109         struct clk_bulk_devres *devres = res;
 110
 111         clk_bulk_put(devres->num_clks, devres->clks);
 112 }
 113
 114 static int __devm_clk_bulk_get(struct device *dev, int num_clks,
 115                                struct clk_bulk_data *clks, bool optional)
 116 {
 117         struct clk_bulk_devres *devres;
 118         int ret;
 119
 120         devres = devres_alloc(devm_clk_bulk_release,
 121                               sizeof(*devres), GFP_KERNEL);
 122         if (!devres)
 123                 return -ENOMEM;
 124
 125         if (optional)
 126                 ret = clk_bulk_get_optional(dev, num_clks, clks);
 127         else
 128                 ret = clk_bulk_get(dev, num_clks, clks);
 129         if (!ret) {
 130                 devres->clks = clks;
 131                 devres->num_clks = num_clks;
 132                 devres_add(dev, devres);
 133         } else {
 134                 devres_free(devres);
 135         }
 136
 137         return ret;
 138 }
 139
 140 int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
 141                       struct clk_bulk_data *clks)
 142 {
 143         return __devm_clk_bulk_get(dev, num_clks, clks, false);
 144 }
 145 EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
 146
 147 int __must_check devm_clk_bulk_get_optional(struct device *dev, int num_clks,
 148                       struct clk_bulk_data *clks)
 149 {
 150         return __devm_clk_bulk_get(dev, num_clks, clks, true);
 151 }
 152 EXPORT_SYMBOL_GPL(devm_clk_bulk_get_optional);
 153
 154 static void devm_clk_bulk_release_all(struct device *dev, void *res)
 155 {
 156         struct clk_bulk_devres *devres = res;
 157
 158         clk_bulk_put_all(devres->num_clks, devres->clks);
 159 }
 160
 161 int __must_check devm_clk_bulk_get_all(struct device *dev,
 162                                        struct clk_bulk_data **clks)
 163 {
 164         struct clk_bulk_devres *devres;
 165         int ret;
 166
 167         devres = devres_alloc(devm_clk_bulk_release_all,
 168                               sizeof(*devres), GFP_KERNEL);
 169         if (!devres)
 170                 return -ENOMEM;
 171
 172         ret = clk_bulk_get_all(dev, &devres->clks);
 173         if (ret > 0) {
 174                 *clks = devres->clks;
 175                 devres->num_clks = ret;
 176                 devres_add(dev, devres);
 177         } else {
 178                 devres_free(devres);
 179         }
 180
 181         return ret;
 182 }
 183 EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
 184
 185 static int devm_clk_match(struct device *dev, void *res, void *data)
 186 {
 187         struct clk **c = res;
 188         if (!c || !*c) {
 189                 WARN_ON(!c || !*c);
 190                 return 0;
 191         }
 192         return *c == data;
 193 }
 194
 195 void devm_clk_put(struct device *dev, struct clk *clk)
 196 {
 197         int ret;
 198
 199         ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
 200
 201         WARN_ON(ret);
 202 }
 203 EXPORT_SYMBOL(devm_clk_put);
 204
 205 struct clk *devm_get_clk_from_child(struct device *dev,
 206                                     struct device_node *np, const char *con_id)
 207 {
 208         struct clk **ptr, *clk;
 209
 210         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
 211         if (!ptr)
 212                 return ERR_PTR(-ENOMEM);
 213
 214         clk = of_clk_get_by_name(np, con_id);
 215         if (!IS_ERR(clk)) {
 216                 *ptr = clk;
 217                 devres_add(dev, ptr);
 218         } else {
 219                 devres_free(ptr);
 220         }
 221
 222         return clk;
 223 }
 224 EXPORT_SYMBOL(devm_get_clk_from_child);