summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorBruno Thomsen <bruno.thomsen@gmail.com>2020-07-30 22:57:48 +0300
committerDavid S. Miller <davem@davemloft.net>2020-08-04 01:01:02 +0300
commitbb3831294cd50750806f2ce8d73317dc8feeda09 (patch)
treeb1954b61b77d4b8ed1a001a58609941317e9f712
parent6259e0f5478d7a7e4ff3e38bc739b612b8907246 (diff)
downloadlinux-bb3831294cd50750806f2ce8d73317dc8feeda09.tar.xz
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: 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>
-rw-r--r--drivers/net/phy/mdio_bus.c2
-rw-r--r--drivers/of/of_mdio.c2
-rw-r--r--include/linux/phy.h2
3 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 5df3782b05b4..0af20faad69d 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -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) {
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index eb84507de28a..cb32d7ef4938 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -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);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 0403eb799913..3a09d2bf69ea 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -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;