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/acpi.h>
  14 #include <linux/clk.h>
  15 #include <linux/clkdev.h>
  16 #include <linux/clk-provider.h>
  17 #include <linux/err.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20
  21 #include "clk-lpss.h"
  22
  23 #define PRV_CLOCK_PARAMS 0x800
  24
  25 static int lpt_clk_probe(struct platform_device *pdev)
  26 {
  27         struct clk *clk;
  28
  29         /* LPSS free running clock */
  30         clk = clk_register_fixed_rate(&pdev->dev, "lpss_clk", NULL, CLK_IS_ROOT,
  31                                       100000000);
  32         if (IS_ERR(clk))
  33                 return PTR_ERR(clk);
  34
  35         /* Shared DMA clock */
  36         clk_register_clkdev(clk, "hclk", "INTL9C60.0.auto");
  37
  38         /* SPI clocks */
  39         clk = clk_register_lpss_gate("spi0_clk", "lpss_clk", "INT33C0", NULL,
  40                                      PRV_CLOCK_PARAMS);
  41         if (!IS_ERR(clk))
  42                 clk_register_clkdev(clk, NULL, "INT33C0:00");
  43
  44         clk = clk_register_lpss_gate("spi1_clk", "lpss_clk", "INT33C1", NULL,
  45                                      PRV_CLOCK_PARAMS);
  46         if (!IS_ERR(clk))
  47                 clk_register_clkdev(clk, NULL, "INT33C1:00");
  48
  49         /* I2C clocks */
  50         clk = clk_register_lpss_gate("i2c0_clk", "lpss_clk", "INT33C2", NULL,
  51                                      PRV_CLOCK_PARAMS);
  52         if (!IS_ERR(clk))
  53                 clk_register_clkdev(clk, NULL, "INT33C2:00");
  54
  55         clk = clk_register_lpss_gate("i2c1_clk", "lpss_clk", "INT33C3", NULL,
  56                                      PRV_CLOCK_PARAMS);
  57         if (!IS_ERR(clk))
  58                 clk_register_clkdev(clk, NULL, "INT33C3:00");
  59
  60         /* UART clocks */
  61         clk = clk_register_lpss_gate("uart0_clk", "lpss_clk", "INT33C4", NULL,
  62                                      PRV_CLOCK_PARAMS);
  63         if (!IS_ERR(clk))
  64                 clk_register_clkdev(clk, NULL, "INT33C4:00");
  65
  66         clk = clk_register_lpss_gate("uart1_clk", "lpss_clk", "INT33C5", NULL,
  67                                      PRV_CLOCK_PARAMS);
  68         if (!IS_ERR(clk))
  69                 clk_register_clkdev(clk, NULL, "INT33C5:00");
  70
  71         return 0;
  72 }
  73
  74 static struct platform_driver lpt_clk_driver = {
  75         .driver = {
  76                 .name = "clk-lpt",
  77                 .owner = THIS_MODULE,
  78         },
  79         .probe = lpt_clk_probe,
  80 };
  81
  82 static int __init lpt_clk_init(void)
  83 {
  84         return platform_driver_register(&lpt_clk_driver);
  85 }
  86 arch_initcall(lpt_clk_init);