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| author | Roger Quadros <rogerq@ti.com> | 2017-04-21 16:15:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-24 12:40:24 -0400 |
| commit | 69226896ad636b94f6d2e55d75ff21a29c4de83b (patch) | |
| tree | f5df9ce46570ffe61c581a9feb68471c9a86cdee /include/linux/phy.h | |
| parent | 15769ff8b6d560a358761598aad5fc413ce2251b (diff) | |
| download | linux-stable-69226896ad636b94f6d2e55d75ff21a29c4de83b.tar.gz linux-stable-69226896ad636b94f6d2e55d75ff21a29c4de83b.tar.bz2 linux-stable-69226896ad636b94f6d2e55d75ff21a29c4de83b.zip | |
mdio_bus: Issue GPIO RESET to PHYs.
Some boards [1] leave the PHYs at an invalid state
during system power-up or reset thus causing unreliability
issues with the PHY which manifests as PHY not being detected
or link not functional. To fix this, these PHYs need to be RESET
via a GPIO connected to the PHY's RESET pin.
Some boards have a single GPIO controlling the PHY RESET pin of all
PHYs on the bus whereas some others have separate GPIOs controlling
individual PHY RESETs.
In both cases, the RESET de-assertion cannot be done in the PHY driver
as the PHY will not probe till its reset is de-asserted.
So do the RESET de-assertion in the MDIO bus driver.
[1] - am572x-idk, am571x-idk, a437x-idk
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/phy.h')
| -rw-r--r-- | include/linux/phy.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/phy.h b/include/linux/phy.h index 624cecf69c28..37ca77d86983 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -217,6 +217,13 @@ struct mii_bus { * matching its address */ int irq[PHY_MAX_ADDR]; + + /* GPIO reset pulse width in microseconds */ + int reset_delay_us; + /* Number of reset GPIOs */ + int num_reset_gpios; + /* Array of RESET GPIO descriptors */ + struct gpio_desc **reset_gpiod; }; #define to_mii_bus(d) container_of(d, struct mii_bus, dev) |