drivers/clk/ti/clockdomain.c

   1 /*
   2  * OMAP clockdomain support
   3  *
   4  * Copyright (C) 2013 Texas Instruments, Inc.
   5  *
   6  * Tero Kristo <t-kristo@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/clk-provider.h>
  19 #include <linux/slab.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/clk/ti.h>
  23
  24 #undef pr_fmt
  25 #define pr_fmt(fmt) "%s: " fmt, __func__
  26
  27 static void __init of_ti_clockdomain_setup(struct device_node *node)
  28 {
  29         struct clk *clk;
  30         struct clk_hw *clk_hw;
  31         const char *clkdm_name = node->name;
  32         int i;
  33         int num_clks;
  34
  35         num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");
  36
  37         for (i = 0; i < num_clks; i++) {
  38                 clk = of_clk_get(node, i);
  39                 if (IS_ERR(clk)) {
  40                         pr_err("%s: Failed get %s' clock nr %d (%ld)\n",
  41                                __func__, node->full_name, i, PTR_ERR(clk));
  42                         continue;
  43                 }
  44                 if (__clk_get_flags(clk) & CLK_IS_BASIC) {
  45                         pr_warn("can't setup clkdm for basic clk %s\n",
  46                                 __clk_get_name(clk));
  47                         continue;
  48                 }
  49                 clk_hw = __clk_get_hw(clk);
  50                 to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
  51                 omap2_init_clk_clkdm(clk_hw);
  52         }
  53 }
  54
  55 static struct of_device_id ti_clkdm_match_table[] __initdata = {
  56         { .compatible = "ti,clockdomain" },
  57         { }
  58 };
  59
  60 /**
  61  * ti_dt_clockdomains_setup - setup device tree clockdomains
  62  *
  63  * Initializes clockdomain nodes for a SoC. This parses through all the
  64  * nodes with compatible = "ti,clockdomain", and add the clockdomain
  65  * info for all the clocks listed under these. This function shall be
  66  * called after rest of the DT clock init has completed and all
  67  * clock nodes have been registered.
  68  */
  69 void __init ti_dt_clockdomains_setup(void)
  70 {
  71         struct device_node *np;
  72         for_each_matching_node(np, ti_clkdm_match_table) {
  73                 of_ti_clockdomain_setup(np);
  74         }
  75 }