Merge branch 'fec-fix-refclk-enable-for-SMSC-LAN8710-20'

Richard Leitner says:

====================
net: fec: fix refclk enable for SMSC LAN8710/20

This patch series fixes the use of the SMSC LAN8710/20 with a Freescale ETH
when the refclk is generated by the FSL.

This patchset depends on the "phylib: Add device reset GPIO support" patch
submitted by Geert Uytterhoeven/Sergei Shtylyov, which was merged to
net-next as commit bafbdd527d56 ("phylib: Add device reset GPIO support").

Changes v5:
	- fix reset delay calculation (max_t instead of min_t)

Changes v4:
	- simplify dts parsing
	- simplify reset delay evaluation and execution
	- fec: ensure to only reset once during fec_enet_open()
	- remove dependency notes from commit message
	- add reviews and acks

Changes v3:
	- use phylib to hard-reset the PHY
	- implement reset delays in phylib
	- add new phylib API & flag (PHY_RST_AFTER_CLK_EN) to determine if
	  a PHY is affected

Changes v2:
	- simplify and fix fec_reset_phy function to support multiple calls
	- include: linux: phy: harmonize phy_id{,_mask} type
	- reset the phy instead of not turning the clock on and off
	  (which would have caused a power consumption regression)
====================

Signed-off-by: David S. Miller <[email protected]>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 1de5e242b8b4..462c17ed87b8 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1218,6 +1218,30 @@ out:
 }
 EXPORT_SYMBOL(phy_loopback);
 
+/**
+ * phy_reset_after_clk_enable - perform a PHY reset if needed
+ * @phydev: target phy_device struct
+ *
+ * Description: Some PHYs are known to need a reset after their refclk was
+ *   enabled. This function evaluates the flags and perform the reset if it's
+ *   needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy
+ *   was reset.
+ */
+int phy_reset_after_clk_enable(struct phy_device *phydev)
+{
+	if (!phydev || !phydev->drv)
+		return -ENODEV;
+
+	if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) {
+		phy_device_reset(phydev, 1);
+		phy_device_reset(phydev, 0);
+		return 1;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_reset_after_clk_enable);
+
 /* Generic PHY support and helper functions */
 
 /**