drivers/clk/x86/clk-lpt.c

   1 /*
   2  * Intel Low Power Subsystem 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 static int lpt_clk_probe(struct platform_device *pdev)
  22 {
  23         struct lpss_clk_data *drvdata;
  24         struct clk *clk;
  25
  26         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
  27         if (!drvdata)
  28                 return -ENOMEM;
  29
  30         /* LPSS free running clock */
  31         drvdata->name = "lpss_clk";
  32         clk = clk_register_fixed_rate(&pdev->dev, drvdata->name, NULL,
  33                                       CLK_IS_ROOT, 100000000);
  34         if (IS_ERR(clk))
  35                 return PTR_ERR(clk);
  36
  37         drvdata->clk = clk;
  38         platform_set_drvdata(pdev, drvdata);
  39         return 0;
  40 }
  41
  42 static struct platform_driver lpt_clk_driver = {
  43         .driver = {
  44                 .name = "clk-lpt",
  45         },
  46         .probe = lpt_clk_probe,
  47 };
  48
  49 int __init lpt_clk_init(void)
  50 {
  51         return platform_driver_register(&lpt_clk_driver);
  52 }