drivers/phy/nop-phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   4  * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
   5  */
   6
   7 #include <clk.h>
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <dm/device.h>
  11 #include <dm/device_compat.h>
  12 #include <generic-phy.h>
  13 #include <asm-generic/gpio.h>
  14
  15 struct nop_phy_priv {
  16         struct clk_bulk bulk;
  17 #if CONFIG_IS_ENABLED(DM_GPIO)
  18         struct gpio_desc reset_gpio;
  19 #endif
  20 };
  21
  22 #if CONFIG_IS_ENABLED(DM_GPIO)
  23 static int nop_phy_reset(struct phy *phy)
  24 {
  25         struct nop_phy_priv *priv = dev_get_priv(phy->dev);
  26
  27         /* Return if there is no gpio since it's optional */
  28         if (!dm_gpio_is_valid(&priv->reset_gpio))
  29                 return 0;
  30
  31         return dm_gpio_set_value(&priv->reset_gpio, true);
  32 }
  33 #endif
  34
  35 static int nop_phy_init(struct phy *phy)
  36 {
  37         struct nop_phy_priv *priv = dev_get_priv(phy->dev);
  38         int ret = 0;
  39
  40         if (CONFIG_IS_ENABLED(CLK)) {
  41                 ret = clk_enable_bulk(&priv->bulk);
  42                 if (ret)
  43                         return ret;
  44         }
  45
  46 #if CONFIG_IS_ENABLED(DM_GPIO)
  47         /* Take phy out of reset */
  48         ret = dm_gpio_set_value(&priv->reset_gpio, false);
  49         if (ret) {
  50                 if (CONFIG_IS_ENABLED(CLK))
  51                         clk_disable_bulk(&priv->bulk);
  52                 return ret;
  53         }
  54 #endif
  55         return 0;
  56 }
  57
  58 static int nop_phy_probe(struct udevice *dev)
  59 {
  60         struct nop_phy_priv *priv = dev_get_priv(dev);
  61         int ret = 0;
  62
  63         if (CONFIG_IS_ENABLED(CLK)) {
  64                 ret = clk_get_bulk(dev, &priv->bulk);
  65                 if (ret < 0) {
  66                         dev_err(dev, "Failed to get clk: %d\n", ret);
  67                         return ret;
  68                 }
  69         }
  70 #if CONFIG_IS_ENABLED(DM_GPIO)
  71         ret = gpio_request_by_name(dev, "reset-gpios", 0,
  72                                    &priv->reset_gpio,
  73                                    GPIOD_IS_OUT);
  74 #endif
  75         if (ret != -ENOENT)
  76                 return ret;
  77
  78         return 0;
  79 }
  80
  81 static const struct udevice_id nop_phy_ids[] = {
  82         { .compatible = "nop-phy" },
  83         { .compatible = "usb-nop-xceiv" },
  84         { }
  85 };
  86
  87 static struct phy_ops nop_phy_ops = {
  88         .init = nop_phy_init,
  89 #if CONFIG_IS_ENABLED(DM_GPIO)
  90         .reset = nop_phy_reset,
  91 #endif
  92 };
  93
  94 U_BOOT_DRIVER(nop_phy) = {
  95         .name   = "nop_phy",
  96         .id     = UCLASS_PHY,
  97         .of_match = nop_phy_ids,
  98         .ops = &nop_phy_ops,
  99         .probe = nop_phy_probe,
 100         .priv_auto      = sizeof(struct nop_phy_priv),
 101 };