Documentation: networking: phy.txt: Update text for indirect MMD access
Update the PHY library documentation to describe how a specific PHY driver can use the PAL MMD register access routines or override those routines with it's own in the event the PHY does not support the IEEE standard for reading and writing MMD phy registers. Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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