drivers/bus/tegra-aconnect.c

   1 /*
   2  * Tegra ACONNECT Bus Driver
   3  *
   4  * Copyright (C) 2016, NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_clock.h>
  16 #include <linux/pm_runtime.h>
  17
  18 static int tegra_aconnect_probe(struct platform_device *pdev)
  19 {
  20         int ret;
  21
  22         if (!pdev->dev.of_node)
  23                 return -EINVAL;
  24
  25         ret = pm_clk_create(&pdev->dev);
  26         if (ret)
  27                 return ret;
  28
  29         ret = of_pm_clk_add_clk(&pdev->dev, "ape");
  30         if (ret)
  31                 goto clk_destroy;
  32
  33         ret = of_pm_clk_add_clk(&pdev->dev, "apb2ape");
  34         if (ret)
  35                 goto clk_destroy;
  36
  37         pm_runtime_enable(&pdev->dev);
  38
  39         of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
  40
  41         dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
  42
  43         return 0;
  44
  45 clk_destroy:
  46         pm_clk_destroy(&pdev->dev);
  47
  48         return ret;
  49 }
  50
  51 static int tegra_aconnect_remove(struct platform_device *pdev)
  52 {
  53         pm_runtime_disable(&pdev->dev);
  54
  55         pm_clk_destroy(&pdev->dev);
  56
  57         return 0;
  58 }
  59
  60 static int tegra_aconnect_runtime_resume(struct device *dev)
  61 {
  62         return pm_clk_resume(dev);
  63 }
  64
  65 static int tegra_aconnect_runtime_suspend(struct device *dev)
  66 {
  67         return pm_clk_suspend(dev);
  68 }
  69
  70 static const struct dev_pm_ops tegra_aconnect_pm_ops = {
  71         SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
  72                            tegra_aconnect_runtime_resume, NULL)
  73 };
  74
  75 static const struct of_device_id tegra_aconnect_of_match[] = {
  76         { .compatible = "nvidia,tegra210-aconnect", },
  77         { }
  78 };
  79 MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
  80
  81 static struct platform_driver tegra_aconnect_driver = {
  82         .probe = tegra_aconnect_probe,
  83         .remove = tegra_aconnect_remove,
  84         .driver = {
  85                 .name = "tegra-aconnect",
  86                 .of_match_table = tegra_aconnect_of_match,
  87                 .pm = &tegra_aconnect_pm_ops,
  88         },
  89 };
  90 module_platform_driver(tegra_aconnect_driver);
  91
  92 MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
  93 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
  94 MODULE_LICENSE("GPL v2");