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Subject[PATCH v9 1/3] net: mdio: add helpers to extract clause 45 regad and devad fields
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>

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>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
v9: unchanged
v8: First inclusing upon comment on mailing list

include/linux/mdio.h | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 9f3587a61e145..ecac96d52e010 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -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)
{
--
2.34.1
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