target/linux/adm5120/files/arch/mips/adm5120/clock.c

   1 /*
   2  *  $Id$
   3  *
   4  *  ADM5120 minimal CLK API implementation
   5  *
   6  *  Copyright (C) 2007 OpenWrt.org
   7  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   8  *
   9  *  This file was based on the CLK API implementation in:
  10  *      arch/mips/tx4938/toshiba_rbtx4938/setup.c
  11  *      Copyright (C) 2000-2001 Toshiba Corporation
  12  *      2003-2005 (c) MontaVista Software, Inc.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify it
  15  *  under the terms of the GNU General Public License version 2 as published
  16  *  by the Free Software Foundation.
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/string.h>
  22 #include <linux/module.h>
  23 #include <linux/err.h>
  24 #include <linux/clk.h>
  25
  26 #include <adm5120_defs.h>
  27
  28 struct clk {
  29         unsigned long rate;
  30 };
  31
  32 static struct clk uart_clk = {
  33         .rate = ADM5120_UART_CLOCK
  34 };
  35
  36 struct clk *clk_get(struct device *dev, const char *id)
  37 {
  38         if (!strcmp(id, "UARTCLK"))
  39                 return &uart_clk;
  40
  41         return ERR_PTR(-ENOENT);
  42 }
  43 EXPORT_SYMBOL(clk_get);
  44
  45 int clk_enable(struct clk *clk)
  46 {
  47         return 0;
  48 }
  49 EXPORT_SYMBOL(clk_enable);
  50
  51 void clk_disable(struct clk *clk)
  52 {
  53 }
  54 EXPORT_SYMBOL(clk_disable);
  55
  56 unsigned long clk_get_rate(struct clk *clk)
  57 {
  58         return clk->rate;
  59 }
  60 EXPORT_SYMBOL(clk_get_rate);
  61
  62 void clk_put(struct clk *clk)
  63 {
  64 }
  65 EXPORT_SYMBOL(clk_put);