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net: phy: broadcom: add bcm54xx_auxctl_read 

Add a helper function to read the AUXCTL register for the BCM54xx.  This
mirrors the bcm54xx_auxctl_write function already present in the code.

Signed-off-by: Jon Mason <jon.mason@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Mason 2016-11-04 01:10:56 -04:00 committed by David S. Miller
parent 94edc86bf1
commit 5b4e290051
2 changed files with 11 additions and 0 deletions
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10
drivers/net/phy/broadcom.c
View File

@ -30,6 +30,16 @@ MODULE_DESCRIPTION("Broadcom PHY driver");
MODULE_AUTHOR("Maciej W. Rozycki");
MODULE_LICENSE("GPL");
static int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum)
{
/* The register must be written to both the Shadow Register Select and
* the Shadow Read Register Selector
*/
phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum |
regnum << MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT);
return phy_read(phydev, MII_BCM54XX_AUX_CTL);
}
static int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val)
{
return phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum | val);

1
include/linux/brcmphy.h
View File

@ -110,6 +110,7 @@
#define MII_BCM54XX_AUXCTL_MISC_FORCE_AMDIX 0x0200
#define MII_BCM54XX_AUXCTL_MISC_RDSEL_MISC 0x7000
#define MII_BCM54XX_AUXCTL_SHDWSEL_MISC 0x0007
#define MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT 12
#define MII_BCM54XX_AUXCTL_SHDWSEL_MASK 0x0007