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net: mdiobus: add reset-post-delay-us handling

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Load new "reset-post-delay-us" value from MDIO properties,
and if configured to a greater then zero delay do a
flexible sleeping delay after MDIO bus reset deassert.
This allows devices to exit reset state before start
bus communication.

Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruno Thomsen 2020-07-30 21:57:48 +02:00 committed by David S. Miller
parent 6259e0f547
commit bb3831294c
3 changed files with 6 additions and 0 deletions
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2
drivers/net/phy/mdio_bus.c
View file

@ -556,6 +556,8 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
gpiod_set_value_cansleep(gpiod, 1);
fsleep(bus->reset_delay_us);
gpiod_set_value_cansleep(gpiod, 0);
if (bus->reset_post_delay_us > 0)
fsleep(bus->reset_post_delay_us);
}
if (bus->reset) {

2
drivers/of/of_mdio.c
View file

@ -268,6 +268,8 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
/* Get bus level PHY reset GPIO details */
mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);
mdio->reset_post_delay_us = 0;
of_property_read_u32(np, "reset-post-delay-us", &mdio->reset_post_delay_us);
/* Register the MDIO bus */
rc = mdiobus_register(mdio);

2
include/linux/phy.h
View file

@ -293,6 +293,8 @@ struct mii_bus {
/* GPIO reset pulse width in microseconds */
int reset_delay_us;
/* GPIO reset deassert delay in microseconds */
int reset_post_delay_us;
/* RESET GPIO descriptor pointer */
struct gpio_desc *reset_gpiod;