drivers/pwm/pwm-tipwmss.c

   1 /*
   2  * TI PWM Subsystem driver
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   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
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/io.h>
  21 #include <linux/err.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/of_device.h>
  24
  25 static const struct of_device_id pwmss_of_match[] = {
  26         { .compatible   = "ti,am33xx-pwmss" },
  27         {},
  28 };
  29 MODULE_DEVICE_TABLE(of, pwmss_of_match);
  30
  31 static int pwmss_probe(struct platform_device *pdev)
  32 {
  33         int ret;
  34         struct device_node *node = pdev->dev.of_node;
  35
  36         pm_runtime_enable(&pdev->dev);
  37         pm_runtime_get_sync(&pdev->dev);
  38
  39         /* Populate all the child nodes here... */
  40         ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
  41         if (ret)
  42                 dev_err(&pdev->dev, "no child node found\n");
  43
  44         return ret;
  45 }
  46
  47 static int pwmss_remove(struct platform_device *pdev)
  48 {
  49         pm_runtime_put_sync(&pdev->dev);
  50         pm_runtime_disable(&pdev->dev);
  51         return 0;
  52 }
  53
  54 #ifdef CONFIG_PM_SLEEP
  55 static int pwmss_suspend(struct device *dev)
  56 {
  57         pm_runtime_put_sync(dev);
  58         return 0;
  59 }
  60
  61 static int pwmss_resume(struct device *dev)
  62 {
  63         pm_runtime_get_sync(dev);
  64         return 0;
  65 }
  66 #endif
  67
  68 static SIMPLE_DEV_PM_OPS(pwmss_pm_ops, pwmss_suspend, pwmss_resume);
  69
  70 static struct platform_driver pwmss_driver = {
  71         .driver = {
  72                 .name   = "pwmss",
  73                 .pm     = &pwmss_pm_ops,
  74                 .of_match_table = pwmss_of_match,
  75         },
  76         .probe  = pwmss_probe,
  77         .remove = pwmss_remove,
  78 };
  79
  80 module_platform_driver(pwmss_driver);
  81
  82 MODULE_DESCRIPTION("PWM Subsystem driver");
  83 MODULE_AUTHOR("Texas Instruments");
  84 MODULE_LICENSE("GPL");