drivers/clk/clk-bulk.c

   1 /*
   2  * Copyright 2017 NXP
   3  *
   4  * Dong Aisheng <aisheng.dong@nxp.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/device.h>
  21 #include <linux/export.h>
  22
  23 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
  24 {
  25         while (--num_clks >= 0) {
  26                 clk_put(clks[num_clks].clk);
  27                 clks[num_clks].clk = NULL;
  28         }
  29 }
  30 EXPORT_SYMBOL_GPL(clk_bulk_put);
  31
  32 int __must_check clk_bulk_get(struct device *dev, int num_clks,
  33                               struct clk_bulk_data *clks)
  34 {
  35         int ret;
  36         int i;
  37
  38         for (i = 0; i < num_clks; i++)
  39                 clks[i].clk = NULL;
  40
  41         for (i = 0; i < num_clks; i++) {
  42                 clks[i].clk = clk_get(dev, clks[i].id);
  43                 if (IS_ERR(clks[i].clk)) {
  44                         ret = PTR_ERR(clks[i].clk);
  45                         dev_err(dev, "Failed to get clk '%s': %d\n",
  46                                 clks[i].id, ret);
  47                         clks[i].clk = NULL;
  48                         goto err;
  49                 }
  50         }
  51
  52         return 0;
  53
  54 err:
  55         clk_bulk_put(i, clks);
  56
  57         return ret;
  58 }
  59 EXPORT_SYMBOL(clk_bulk_get);
  60
  61 #ifdef CONFIG_HAVE_CLK_PREPARE
  62
  63 /**
  64  * clk_bulk_unprepare - undo preparation of a set of clock sources
  65  * @num_clks: the number of clk_bulk_data
  66  * @clks: the clk_bulk_data table being unprepared
  67  *
  68  * clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable.
  69  * Returns 0 on success, -EERROR otherwise.
  70  */
  71 void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks)
  72 {
  73         while (--num_clks >= 0)
  74                 clk_unprepare(clks[num_clks].clk);
  75 }
  76 EXPORT_SYMBOL_GPL(clk_bulk_unprepare);
  77
  78 /**
  79  * clk_bulk_prepare - prepare a set of clocks
  80  * @num_clks: the number of clk_bulk_data
  81  * @clks: the clk_bulk_data table being prepared
  82  *
  83  * clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable.
  84  * Returns 0 on success, -EERROR otherwise.
  85  */
  86 int __must_check clk_bulk_prepare(int num_clks,
  87                                   const struct clk_bulk_data *clks)
  88 {
  89         int ret;
  90         int i;
  91
  92         for (i = 0; i < num_clks; i++) {
  93                 ret = clk_prepare(clks[i].clk);
  94                 if (ret) {
  95                         pr_err("Failed to prepare clk '%s': %d\n",
  96                                 clks[i].id, ret);
  97                         goto err;
  98                 }
  99         }
 100
 101         return 0;
 102
 103 err:
 104         clk_bulk_unprepare(i, clks);
 105
 106         return  ret;
 107 }
 108
 109 #endif /* CONFIG_HAVE_CLK_PREPARE */
 110
 111 /**
 112  * clk_bulk_disable - gate a set of clocks
 113  * @num_clks: the number of clk_bulk_data
 114  * @clks: the clk_bulk_data table being gated
 115  *
 116  * clk_bulk_disable must not sleep, which differentiates it from
 117  * clk_bulk_unprepare. clk_bulk_disable must be called before
 118  * clk_bulk_unprepare.
 119  */
 120 void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks)
 121 {
 122
 123         while (--num_clks >= 0)
 124                 clk_disable(clks[num_clks].clk);
 125 }
 126 EXPORT_SYMBOL_GPL(clk_bulk_disable);
 127
 128 /**
 129  * clk_bulk_enable - ungate a set of clocks
 130  * @num_clks: the number of clk_bulk_data
 131  * @clks: the clk_bulk_data table being ungated
 132  *
 133  * clk_bulk_enable must not sleep
 134  * Returns 0 on success, -EERROR otherwise.
 135  */
 136 int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks)
 137 {
 138         int ret;
 139         int i;
 140
 141         for (i = 0; i < num_clks; i++) {
 142                 ret = clk_enable(clks[i].clk);
 143                 if (ret) {
 144                         pr_err("Failed to enable clk '%s': %d\n",
 145                                 clks[i].id, ret);
 146                         goto err;
 147                 }
 148         }
 149
 150         return 0;
 151
 152 err:
 153         clk_bulk_disable(i, clks);
 154
 155         return  ret;
 156 }
 157 EXPORT_SYMBOL_GPL(clk_bulk_enable);