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net: eth-phy: add support of device tree configuration for gpio reset

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The gpio reset and the assert or deassert delay are defined in generic
binding of the ethernet phy in Linux:
Documentation/devicetree/bindings/net/ethernet-phy.yaml

  reset-gpios:
    maxItems: 1
    description:
      The GPIO phandle and specifier for the PHY reset signal.

  reset-assert-us:
    description:
      Delay after the reset was asserted in microseconds. If this
      property is missing the delay will be skipped.

  reset-deassert-us:
    description:
      Delay after the reset was deasserted in microseconds. If
      this property is missing the delay will be skipped.

See also U-Boot: doc/device-tree-bindings/net/phy.txt

This patch adds the parsing of this common DT properties in the
u-class "eth_phy_generic", used by default in the associated driver
"eth_phy_generic_drv"

This parsing function eth_phy_of_to_plat can be reused by other
ethernet phy drivers for this uclass UCLASS_ETH_PHY.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Patrick Delaunay 2021-07-20 20:09:51 +02:00 • committed by Ramon Fried
parent b8da46fda6
commit d33982d5bc
1 changed files with 56 additions and 0 deletions
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56
drivers/net/eth-phy-uclass.c
View file

@ -6,12 +6,17 @@
#include <common.h>
#include <dm.h>
#include <net.h>
#include <asm-generic/gpio.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)
@ -110,13 +115,64 @@ int eth_phy_get_addr(struct udevice *dev)
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);
if (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);
return 0;
}
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,
};