linux/drivers/clk/ti/clockdomain.c
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   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
  27static 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
  55static 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 */
  69void __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}
  76
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