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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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13
drivers/net/phy/mdio_device.c
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@@ -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);