kernel/drivers/clk/at91/sckc.c

   1 /*
   2  * drivers/clk/at91/sckc.c
   3  *
   4  *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  */
  12
  13 #include <linux/clk-provider.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/of.h>
  16 #include <linux/of_address.h>
  17 #include <linux/io.h>
  18
  19 #include "sckc.h"
  20
  21 static const struct of_device_id sckc_clk_ids[] __initconst = {
  22         /* Slow clock */
  23         {
  24                 .compatible = "atmel,at91sam9x5-clk-slow-osc",
  25                 .data = of_at91sam9x5_clk_slow_osc_setup,
  26         },
  27         {
  28                 .compatible = "atmel,at91sam9x5-clk-slow-rc-osc",
  29                 .data = of_at91sam9x5_clk_slow_rc_osc_setup,
  30         },
  31         {
  32                 .compatible = "atmel,at91sam9x5-clk-slow",
  33                 .data = of_at91sam9x5_clk_slow_setup,
  34         },
  35         { /*sentinel*/ }
  36 };
  37
  38 static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
  39 {
  40         struct device_node *childnp;
  41         void (*clk_setup)(struct device_node *, void __iomem *);
  42         const struct of_device_id *clk_id;
  43         void __iomem *regbase = of_iomap(np, 0);
  44
  45         if (!regbase)
  46                 return;
  47
  48         for_each_child_of_node(np, childnp) {
  49                 clk_id = of_match_node(sckc_clk_ids, childnp);
  50                 if (!clk_id)
  51                         continue;
  52                 clk_setup = clk_id->data;
  53                 clk_setup(childnp, regbase);
  54         }
  55 }
  56 CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
  57                of_at91sam9x5_sckc_setup);