drivers/clk/sunxi/clk-a10-codec.c

   1 /*
   2  * Copyright 2013 Emilio López
   3  *
   4  * Emilio López <emilio@elopez.com.ar>
   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  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk-provider.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20
  21 #define SUN4I_CODEC_GATE        31
  22
  23 static void __init sun4i_codec_clk_setup(struct device_node *node)
  24 {
  25         struct clk *clk;
  26         const char *clk_name = node->name, *parent_name;
  27         void __iomem *reg;
  28
  29         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  30         if (IS_ERR(reg))
  31                 return;
  32
  33         of_property_read_string(node, "clock-output-names", &clk_name);
  34         parent_name = of_clk_get_parent_name(node, 0);
  35
  36         clk = clk_register_gate(NULL, clk_name, parent_name,
  37                                 CLK_SET_RATE_PARENT, reg,
  38                                 SUN4I_CODEC_GATE, 0, NULL);
  39
  40         if (!IS_ERR(clk))
  41                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  42 }
  43 CLK_OF_DECLARE(sun4i_codec, "allwinner,sun4i-a10-codec-clk",
  44                sun4i_codec_clk_setup);