Subject: [PATCH v10 2/3] net: mdio: add helpers to extract clause 45 regad and devad fields

From: Daniel Golle <[email-masked]>
Date: Sun, 2 Jan 2022 15:48:50 +0000

From: "Russell King (Oracle)" <[email-masked]>

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 <[email-masked]>
Signed-off-by: Russell King (Oracle) <[email-masked]>
Signed-off-by: Daniel Golle <[email-masked]>
---
v10: correct order of SoB lines
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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