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net: mdio: add helpers to extract clause 45 regad and devad fields 

Add a couple of helpers and definitions to extract the clause 45 regad
and devad fields from the regnum passed into MDIO drivers.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King (Oracle) 2022-01-04 12:07:00 +00:00 committed by David S. Miller
parent eda80b249d
commit c6af53f038
1 changed files with 12 additions and 0 deletions
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12
include/linux/mdio.h
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@ -7,6 +7,7 @@
#define __LINUX_MDIO_H__
#include <uapi/linux/mdio.h>
#include <linux/bitfield.h>
#include <linux/mod_devicetable.h>
/* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
@ -14,6 +15,7 @@
*/
#define MII_ADDR_C45 (1<<30)
#define MII_DEVADDR_C45_SHIFT 16
#define MII_DEVADDR_C45_MASK GENMASK(20, 16)
#define MII_REGADDR_C45_MASK GENMASK(15, 0)
struct gpio_desc;
@ -381,6 +383,16 @@ static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
}
static inline u16 mdiobus_c45_regad(u32 regnum)
{
return FIELD_GET(MII_REGADDR_C45_MASK, regnum);
}
static inline u16 mdiobus_c45_devad(u32 regnum)
{
return FIELD_GET(MII_DEVADDR_C45_MASK, regnum);
}
static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
u16 regnum)
{