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| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2017-12-04 13:35:05 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-05 12:51:19 -0500 |
| commit | bafbdd527d569c8200521f2f7579f65a044271be (patch) | |
| tree | 51db9962c079c2ca76a5e9f6d3cb2dc222999c37 /include/linux/phy.h | |
| parent | 62b32379fd124fea521484ba7e220d8a449f0b59 (diff) | |
| download | linux-stable-bafbdd527d569c8200521f2f7579f65a044271be.tar.gz linux-stable-bafbdd527d569c8200521f2f7579f65a044271be.tar.bz2 linux-stable-bafbdd527d569c8200521f2f7579f65a044271be.zip | |
phylib: Add device reset GPIO support
The PHY devices sometimes do have their reset signal (maybe even power
supply?) tied to some GPIO and sometimes it also does happen that a boot
loader does not leave it deasserted. So far this issue has been attacked
from (as I believe) a wrong angle: by teaching the MAC driver to manipulate
the GPIO in question; that solution, when applied to the device trees, led
to adding the PHY reset GPIO properties to the MAC device node, with one
exception: Cadence MACB driver which could handle the "reset-gpios" prop
in a PHY device subnode. I believe that the correct approach is to teach
the 'phylib' to get the MDIO device reset GPIO from the device tree node
corresponding to this device -- which this patch is doing...
Note that I had to modify the AT803x PHY driver as it would stop working
otherwise -- it made use of the reset GPIO for its own purposes...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Rob Herring <robh@kernel.org>
[geert: Propagate actual errors from fwnode_get_named_gpiod()]
[geert: Avoid destroying initial setup]
[geert: Consolidate GPIO descriptor acquiring code]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/phy.h')
| -rw-r--r-- | include/linux/phy.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/phy.h b/include/linux/phy.h index 7570cb838410..d3037e2ffbc4 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -854,6 +854,11 @@ int phy_aneg_done(struct phy_device *phydev); int phy_stop_interrupts(struct phy_device *phydev); int phy_restart_aneg(struct phy_device *phydev); +static inline void phy_device_reset(struct phy_device *phydev, int value) +{ + mdio_device_reset(&phydev->mdio, value); +} + #define phydev_err(_phydev, format, args...) \ dev_err(&_phydev->mdio.dev, format, ##args) |