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| author |   Richard Leitner <richard.leitner@skidata.com> | 2017-12-11 13:16:57 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-12-13 11:22:53 -0500 |
| commit | 3a30ae6ef3cba29c83ca791bde0d06f182d5678d (patch) | |
| tree | f2da147aeebdf7292a3e1b46e657ca623382310a /drivers/net/phy/mdio_device.c | |
| parent | Merge branch 'mvpp2-various-improvements' (diff) | |
| download | linux-dev-3a30ae6ef3cba29c83ca791bde0d06f182d5678d.tar.xz linux-dev-3a30ae6ef3cba29c83ca791bde0d06f182d5678d.zip | |
phylib: Add device reset delay support
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>
Diffstat (limited to 'drivers/net/phy/mdio_device.c')
| -rw-r--r-- | drivers/net/phy/mdio_device.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c index 75d97dd9fb28..843c1dde93e4 100644 --- a/drivers/net/phy/mdio_device.c +++ b/drivers/net/phy/mdio_device.c @@ -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); |