Commit bb383129 authored by Bruno Thomsen's avatar Bruno Thomsen Committed by David S. Miller
Browse files

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



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: default avatarBruno Thomsen <bruno.thomsen@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6259e0f5

drivers/net/phy/mdio_bus.c

+2 −0
Original line number Diff line number Diff line
@@ -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) {

drivers/of/of_mdio.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/phy.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

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