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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2020 NXP
*/
#define LOG_CATEGORY UCLASS_ETH_PHY
#include <dm.h>
#include <log.h>
#include <net.h>
#include <asm-generic/gpio.h>
#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#include <dm/lists.h>
#include <linux/delay.h>
struct eth_phy_device_priv {
struct mii_dev *mdio_bus;
struct gpio_desc reset_gpio;
u32 reset_assert_delay;
u32 reset_deassert_delay;
};
int eth_phy_binds_nodes(struct udevice *eth_dev)
{
ofnode mdio_node, phy_node;
const char *node_name;
int ret;
/* search a subnode named "mdio.*" */
dev_for_each_subnode(mdio_node, eth_dev) {
node_name = ofnode_get_name(mdio_node);
if (!strncmp(node_name, "mdio", 4))
break;
}
if (!ofnode_valid(mdio_node)) {
dev_dbg(eth_dev, "%s: %s mdio subnode not found!\n", __func__,
eth_dev->name);
return -ENXIO;
}
dev_dbg(eth_dev, "%s: %s subnode found!\n", __func__, node_name);
ofnode_for_each_subnode(phy_node, mdio_node) {
node_name = ofnode_get_name(phy_node);
dev_dbg(eth_dev, "* Found child node: '%s'\n", node_name);
ret = device_bind_driver_to_node(eth_dev,
"eth_phy_generic_drv",
node_name, phy_node, NULL);
if (ret) {
dev_dbg(eth_dev, " - Eth phy binding error: %d\n", ret);
continue;
}
dev_dbg(eth_dev, " - bound phy device: '%s'\n", node_name);
}
return 0;
}
int eth_phy_set_mdio_bus(struct udevice *eth_dev, struct mii_dev *mdio_bus)
{
struct udevice *dev;
struct eth_phy_device_priv *uc_priv;
for (uclass_first_device(UCLASS_ETH_PHY, &dev); dev;
uclass_next_device(&dev)) {
if (dev->parent == eth_dev) {
uc_priv = (struct eth_phy_device_priv *)(dev_get_uclass_priv(dev));
if (!uc_priv->mdio_bus)
uc_priv->mdio_bus = mdio_bus;
}
}
return 0;
}
struct mii_dev *eth_phy_get_mdio_bus(struct udevice *eth_dev)
{
int ret;
struct udevice *phy_dev;
struct eth_phy_device_priv *uc_priv;
/* Will probe the parent of phy device, then phy device */
ret = uclass_get_device_by_phandle(UCLASS_ETH_PHY, eth_dev,
"phy-handle", &phy_dev);
if (!ret) {
if (eth_dev != phy_dev->parent) {
/*
* phy_dev is shared and controlled by
* other eth controller
*/
uc_priv = (struct eth_phy_device_priv *)(dev_get_uclass_priv(phy_dev));
if (uc_priv->mdio_bus)
log_notice("Get shared mii bus on %s\n", eth_dev->name);
else
log_notice("Can't get shared mii bus on %s\n", eth_dev->name);
return uc_priv->mdio_bus;
}
} else {
log_debug("Can't find phy-handle for %s\n", eth_dev->name);
}
return NULL;
}
int eth_phy_get_addr(struct udevice *dev)
{
struct ofnode_phandle_args phandle_args;
int reg;
if (dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0,
&phandle_args)) {
dev_dbg(dev, "Failed to find phy-handle");
return -ENODEV;
}
reg = ofnode_read_u32_default(phandle_args.node, "reg", 0);
return reg;
}
/* parsing generic properties of devicetree/bindings/net/ethernet-phy.yaml */
static int eth_phy_of_to_plat(struct udevice *dev)
{
struct eth_phy_device_priv *uc_priv = dev_get_uclass_priv(dev);
int ret;
if (!CONFIG_IS_ENABLED(DM_GPIO))
return 0;
/* search "reset-gpios" in phy node */
ret = gpio_request_by_name(dev, "reset-gpios", 0,
&uc_priv->reset_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
if (ret && ret != -ENOENT)
return ret;
uc_priv->reset_assert_delay = dev_read_u32_default(dev, "reset-assert-us", 0);
uc_priv->reset_deassert_delay = dev_read_u32_default(dev, "reset-deassert-us", 0);
/* These are used by some DTs, try these as a fallback. */
if (!uc_priv->reset_assert_delay && !uc_priv->reset_deassert_delay) {
uc_priv->reset_assert_delay =
dev_read_u32_default(dev, "reset-delay-us", 0);
uc_priv->reset_deassert_delay =
dev_read_u32_default(dev, "reset-post-delay-us", 0);
}
return 0;
}
static void eth_phy_reset(struct udevice *dev, int value)
{
struct eth_phy_device_priv *uc_priv = dev_get_uclass_priv(dev);
u32 delay;
if (!CONFIG_IS_ENABLED(DM_GPIO))
return;
if (!dm_gpio_is_valid(&uc_priv->reset_gpio))
return;
dm_gpio_set_value(&uc_priv->reset_gpio, value);
delay = value ? uc_priv->reset_assert_delay : uc_priv->reset_deassert_delay;
if (delay)
udelay(delay);
}
static int eth_phy_pre_probe(struct udevice *dev)
{
/* Assert and deassert the reset signal */
eth_phy_reset(dev, 1);
eth_phy_reset(dev, 0);
return 0;
}
UCLASS_DRIVER(eth_phy_generic) = {
.id = UCLASS_ETH_PHY,
.name = "eth_phy_generic",
.per_device_auto = sizeof(struct eth_phy_device_priv),
.pre_probe = eth_phy_pre_probe,
};
U_BOOT_DRIVER(eth_phy_generic_drv) = {
.name = "eth_phy_generic_drv",
.id = UCLASS_ETH_PHY,
.of_to_plat = eth_phy_of_to_plat,
};
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