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phylib: Add device reset delay support

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Some PHYs need a minimum time after the reset gpio was asserted and/or
deasserted. To ensure we meet these timing requirements add two new
optional devicetree parameters for the phy: reset-delay-us and
reset-post-delay-us.

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Leitner 2017-12-11 13:16:57 +01:00 committed by David S. Miller
parent 9cca5d2f1b
commit 3a30ae6ef3
4 changed files with 27 additions and 2 deletions
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10
Documentation/devicetree/bindings/net/phy.txt
View File

@ -55,6 +55,12 @@ Optional Properties:
- reset-gpios: The GPIO phandle and specifier for the PHY reset signal.
- reset-delay-us: Delay after the reset was asserted in microseconds.
If this property is missing the delay will be skipped.
- reset-post-delay-us: Delay after the reset was deasserted in microseconds.
If this property is missing the delay will be skipped.
Example:
ethernet-phy@0 {
@ -62,4 +68,8 @@ ethernet-phy@0 {
interrupt-parent = <&PIC>;
interrupts = <35 IRQ_TYPE_EDGE_RISING>;
reg = <0>;
reset-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
reset-delay-us = <1000>;
reset-post-delay-us = <2000>;
};

13
drivers/net/phy/mdio_device.c
View File

@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/delay.h>
void mdio_device_free(struct mdio_device *mdiodev)
{
@ -118,8 +119,16 @@ EXPORT_SYMBOL(mdio_device_remove);
void mdio_device_reset(struct mdio_device *mdiodev, int value)
{
if (mdiodev->reset)
gpiod_set_value(mdiodev->reset, value);
unsigned int d;
if (!mdiodev->reset)
return;
gpiod_set_value(mdiodev->reset, value);
d = value ? mdiodev->reset_delay : mdiodev->reset_post_delay;
if (d)
usleep_range(d, d + max_t(unsigned int, d / 10, 100));
}
EXPORT_SYMBOL(mdio_device_reset);

4
drivers/of/of_mdio.c
View File

@ -77,6 +77,10 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio,
if (of_property_read_bool(child, "broken-turn-around"))
mdio->phy_ignore_ta_mask |= 1 << addr;
of_property_read_u32(child, "reset-delay-us", &phy->mdio.reset_delay);
of_property_read_u32(child, "reset-post-delay-us",
&phy->mdio.reset_post_delay);
/* Associate the OF node with the device structure so it
* can be looked up later */
of_node_get(child);

2
include/linux/mdio.h
View File

@ -41,6 +41,8 @@ struct mdio_device {
int addr;
int flags;
struct gpio_desc *reset;
unsigned int reset_delay;
unsigned int reset_post_delay;
};
#define to_mdio_device(d) container_of(d, struct mdio_device, dev)