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
  38         /* Populate all the child nodes here... */
  39         ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
  40         if (ret)
  41                 dev_err(&pdev->dev, "no child node found\n");
  42
  43         return ret;
  44 }
  45
  46 static int pwmss_remove(struct platform_device *pdev)
  47 {
  48         pm_runtime_disable(&pdev->dev);
  49         return 0;
  50 }
  51
  52 static struct platform_driver pwmss_driver = {
  53         .driver = {
  54                 .name   = "pwmss",
  55                 .of_match_table = pwmss_of_match,
  56         },
  57         .probe  = pwmss_probe,
  58         .remove = pwmss_remove,
  59 };
  60
  61 module_platform_driver(pwmss_driver);
  62
  63 MODULE_DESCRIPTION("PWM Subsystem driver");
  64 MODULE_AUTHOR("Texas Instruments");
  65 MODULE_LICENSE("GPL");