text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * dwc3-of-simple.c - OF glue layer for simple integrations
   *
   * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
   *
   * Author: Felipe Balbi <balbi@ti.com>
   *
   * Copyright (C) 2018 BayLibre, SAS
   * Author: Neil Armstrong <narmstron@baylibre.com>
   */
  
  #include <common.h>
  #include <dm.h>
  #include <reset.h>
  #include <clk.h>
  
  struct dwc3_of_simple {
  	struct clk_bulk		clks;
  	struct reset_ctl_bulk	resets;
  };
  
  static int dwc3_of_simple_reset_init(struct udevice *dev,
  				     struct dwc3_of_simple *simple)
  {
  	int ret;
  
  	ret = reset_get_bulk(dev, &simple->resets);
  	if (ret == -ENOTSUPP)
  		return 0;
  	else if (ret)
  		return ret;
  
  	ret = reset_deassert_bulk(&simple->resets);
  	if (ret) {
  		reset_release_bulk(&simple->resets);
  		return ret;
  	}
  
  	return 0;
  }
  
  static int dwc3_of_simple_clk_init(struct udevice *dev,
  				   struct dwc3_of_simple *simple)
  {
  	int ret;
  
  	ret = clk_get_bulk(dev, &simple->clks);
  	if (ret == -ENOSYS)
  		return 0;
  	if (ret)
  		return ret;
  
  #if CONFIG_IS_ENABLED(CLK)
  	ret = clk_enable_bulk(&simple->clks);
  	if (ret) {
  		clk_release_bulk(&simple->clks);
  		return ret;
  	}
  #endif
  
  	return 0;
  }
  
  static int dwc3_of_simple_probe(struct udevice *dev)
  {
  	struct dwc3_of_simple *simple = dev_get_plat(dev);
  	int ret;
  
  	ret = dwc3_of_simple_clk_init(dev, simple);
  	if (ret)
  		return ret;
  
  	ret = dwc3_of_simple_reset_init(dev, simple);
  	if (ret)
  		return ret;
  
  	return 0;
  }
  
  static int dwc3_of_simple_remove(struct udevice *dev)
  {
  	struct dwc3_of_simple *simple = dev_get_plat(dev);
  
  	reset_release_bulk(&simple->resets);
  
  	clk_release_bulk(&simple->clks);
  
  	return dm_scan_fdt_dev(dev);
  }
  
  static const struct udevice_id dwc3_of_simple_ids[] = {
  	{ .compatible = "amlogic,meson-gxl-dwc3" },
  	{ .compatible = "rockchip,rk3399-dwc3" },
  	{ .compatible = "ti,dwc3" },
  	{ }
  };
  
  U_BOOT_DRIVER(dwc3_of_simple) = {
  	.name = "dwc3-of-simple",
  	.id = UCLASS_SIMPLE_BUS,
  	.of_match = dwc3_of_simple_ids,
  	.probe = dwc3_of_simple_probe,
  	.remove = dwc3_of_simple_remove,
  	.plat_auto	= sizeof(struct dwc3_of_simple),
  	.flags = DM_FLAG_ALLOC_PRIV_DMA,
  };
  