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netdev: bfin_mac: document TE setting in RMII modes 

The current code sometimes generates build warnings due to how it checks
the silicon revision, so clean it up and properly document things.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Frysinger 2011-03-27 22:33:13 +00:00 committed by David S. Miller
parent bc8d7da3f1
commit 72f49050ba
1 changed files with 11 additions and 2 deletions
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13
drivers/net/bfin_mac.c
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@ -1237,8 +1237,17 @@ static int bfin_mac_enable(struct phy_device *phydev)
if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
opmode |= RMII; /* For Now only 100MBit are supported */
#if (defined(CONFIG_BF537) || defined(CONFIG_BF536)) && CONFIG_BF_REV_0_2
opmode |= TE;
#if defined(CONFIG_BF537) || defined(CONFIG_BF536)
if (__SILICON_REVISION__ < 3) {
/*
* This isn't publicly documented (fun times!), but in
* silicon <=0.2, the RX and TX pins are clocked together.
* So in order to recv, we must enable the transmit side
* as well. This will cause a spurious TX interrupt too,
* but we can easily consume that.
*/
opmode |= TE;
}
#endif
}