drivers/clk/x86/clk-lpt.c

   1 /*
   2  * Intel Lynxpoint LPSS clocks.
   3  *
   4  * Copyright (C) 2013, Intel Corporation
   5  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
   6  *          Heikki Krogerus <heikki.krogerus@linux.intel.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
  13 #include <linux/clk.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/err.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_data/clk-lpss.h>
  19 #include <linux/platform_device.h>
  20
  21 #define PRV_CLOCK_PARAMS 0x800
  22
  23 static int lpt_clk_probe(struct platform_device *pdev)
  24 {
  25         struct lpss_clk_data *drvdata;
  26         struct clk *clk;
  27
  28         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
  29         if (!drvdata)
  30                 return -ENOMEM;
  31
  32         /* LPSS free running clock */
  33         drvdata->name = "lpss_clk";
  34         clk = clk_register_fixed_rate(&pdev->dev, drvdata->name, NULL,
  35                                       CLK_IS_ROOT, 100000000);
  36         if (IS_ERR(clk))
  37                 return PTR_ERR(clk);
  38
  39         drvdata->clk = clk;
  40         platform_set_drvdata(pdev, drvdata);
  41         return 0;
  42 }
  43
  44 static struct platform_driver lpt_clk_driver = {
  45         .driver = {
  46                 .name = "clk-lpt",
  47                 .owner = THIS_MODULE,
  48         },
  49         .probe = lpt_clk_probe,
  50 };
  51
  52 int __init lpt_clk_init(void)
  53 {
  54         return platform_driver_register(&lpt_clk_driver);
  55 }