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         if (dm_gpio_is_valid(&priv->reset_gpio)) {
  49                 ret = dm_gpio_set_value(&priv->reset_gpio, false);
  50                 if (ret) {
  51                         if (CONFIG_IS_ENABLED(CLK))
  52                                 clk_disable_bulk(&priv->bulk);
  53                         return ret;
  54                 }
  55         }
  56 #endif
  57         return 0;
  58 }
  59
  60 static int nop_phy_probe(struct udevice *dev)
  61 {
  62         struct nop_phy_priv *priv = dev_get_priv(dev);
  63         int ret = 0;
  64
  65         if (CONFIG_IS_ENABLED(CLK)) {
  66                 ret = clk_get_bulk(dev, &priv->bulk);
  67                 if (ret < 0) {
  68                         dev_err(dev, "Failed to get clk: %d\n", ret);
  69                         return ret;
  70                 }
  71         }
  72 #if CONFIG_IS_ENABLED(DM_GPIO)
  73         ret = gpio_request_by_name(dev, "reset-gpios", 0,
  74                                    &priv->reset_gpio,
  75                                    GPIOD_IS_OUT);
  76 #endif
  77         if (ret != -ENOENT)
  78                 return ret;
  79
  80         return 0;
  81 }
  82
  83 static const struct udevice_id nop_phy_ids[] = {
  84         { .compatible = "nop-phy" },
  85         { .compatible = "usb-nop-xceiv" },
  86         { }
  87 };
  88
  89 static struct phy_ops nop_phy_ops = {
  90         .init = nop_phy_init,
  91 #if CONFIG_IS_ENABLED(DM_GPIO)
  92         .reset = nop_phy_reset,
  93 #endif
  94 };
  95
  96 U_BOOT_DRIVER(nop_phy) = {
  97         .name   = "nop_phy",
  98         .id     = UCLASS_PHY,
  99         .of_match = nop_phy_ids,
 100         .ops = &nop_phy_ops,
 101         .probe = nop_phy_probe,
 102         .priv_auto      = sizeof(struct nop_phy_priv),
 103 };