LXR uboot/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
  15struct 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)
  23static 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
  35static 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
  60static 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
  83static const struct udevice_id nop_phy_ids[] = {
  84        { .compatible = "nop-phy" },
  85        { .compatible = "usb-nop-xceiv" },
  86        { }
  87};
  88
  89static 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
  96U_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};
 104