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authorDavid Bauer <mail@david-bauer.net>2019-04-18 00:59:21 +0300
committerDavid S. Miller <davem@davemloft.net>2019-04-19 03:41:51 +0300
commit71dd6c0dff51b5f1fef2e9dfa6f6a948aac975f3 (patch)
tree8e6ec717ab9a043688ddab421f2518cd0095f246 /drivers/net/phy/mdio_bus.c
parentb54dd90cab00f5b64ed8ce533991c20bf781a3cd (diff)
downloadlinux-71dd6c0dff51b5f1fef2e9dfa6f6a948aac975f3.tar.xz
net: phy: add support for reset-controller
This commit adds support for PHY reset pins handled by a reset controller. Signed-off-by: David Bauer <mail@david-bauer.net> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio_bus.c')
-rw-r--r--drivers/net/phy/mdio_bus.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 4be4cc09eb90..ba3d2523808b 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -24,6 +24,7 @@
#include <linux/of_gpio.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
+#include <linux/reset.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
@@ -57,8 +58,23 @@ static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
mdiodev->reset = gpiod;
- /* Assert the reset signal again */
- mdio_device_reset(mdiodev, 1);
+ return 0;
+}
+
+static int mdiobus_register_reset(struct mdio_device *mdiodev)
+{
+ struct reset_control *reset = NULL;
+
+ if (mdiodev->dev.of_node)
+ reset = devm_reset_control_get_exclusive(&mdiodev->dev,
+ "phy");
+ if (PTR_ERR(reset) == -ENOENT ||
+ PTR_ERR(reset) == -ENOTSUPP)
+ reset = NULL;
+ else if (IS_ERR(reset))
+ return PTR_ERR(reset);
+
+ mdiodev->reset_ctrl = reset;
return 0;
}
@@ -74,6 +90,13 @@ int mdiobus_register_device(struct mdio_device *mdiodev)
err = mdiobus_register_gpiod(mdiodev);
if (err)
return err;
+
+ err = mdiobus_register_reset(mdiodev);
+ if (err)
+ return err;
+
+ /* Assert the reset signal */
+ mdio_device_reset(mdiodev, 1);
}
mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;