drivers/core/simple-pm-bus.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2020 Sean Anderson <[email protected]>
   4  */
   5
   6 #include <common.h>
   7 #include <clk.h>
   8 #include <dm.h>
   9
  10 /*
  11  * Power domains are taken care of by driver_probe, so we just have to enable
  12  * clocks
  13  */
  14 static int simple_pm_bus_probe(struct udevice *dev)
  15 {
  16         int ret;
  17         struct clk_bulk *bulk = dev_get_priv(dev);
  18
  19         ret = clk_get_bulk(dev, bulk);
  20         if (ret)
  21                 return ret;
  22
  23         ret = clk_enable_bulk(bulk);
  24         if (ret && ret != -ENOSYS) {
  25                 clk_release_bulk(bulk);
  26                 return ret;
  27         }
  28         return 0;
  29 }
  30
  31 static int simple_pm_bus_remove(struct udevice *dev)
  32 {
  33         int ret;
  34         struct clk_bulk *bulk = dev_get_priv(dev);
  35
  36         ret = clk_release_bulk(bulk);
  37         if (ret && ret != -ENOSYS)
  38                 return ret;
  39         else
  40                 return 0;
  41 }
  42
  43 static const struct udevice_id simple_pm_bus_ids[] = {
  44         { .compatible = "simple-pm-bus" },
  45         { }
  46 };
  47
  48 U_BOOT_DRIVER(simple_pm_bus_drv) = {
  49         .name   = "simple_pm_bus",
  50         .id     = UCLASS_SIMPLE_BUS,
  51         .of_match = simple_pm_bus_ids,
  52         .probe = simple_pm_bus_probe,
  53         .remove = simple_pm_bus_remove,
  54         .priv_auto      = sizeof(struct clk_bulk),
  55         .flags  = DM_FLAG_PRE_RELOC,
  56 };