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854458f986
Import commit ("c6af53f038aa3 net: mdio: add helpers to extract clause
45 regad and devad fields") from Linux 5.17 to allow making the MDIO
code in the ethernet driver more readable.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
54 lines
1.6 KiB
Diff
54 lines
1.6 KiB
Diff
From c6af53f038aa32cec12e8a305ba07c7ef168f1b0 Mon Sep 17 00:00:00 2001
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From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
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Date: Tue, 4 Jan 2022 12:07:00 +0000
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Subject: [PATCH 2/3] net: mdio: add helpers to extract clause 45 regad and
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devad fields
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Add a couple of helpers and definitions to extract the clause 45 regad
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and devad fields from the regnum passed into MDIO drivers.
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Tested-by: Daniel Golle <daniel@makrotopia.org>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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include/linux/mdio.h | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/include/linux/mdio.h
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+++ b/include/linux/mdio.h
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@@ -7,6 +7,7 @@
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#define __LINUX_MDIO_H__
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#include <uapi/linux/mdio.h>
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+#include <linux/bitfield.h>
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#include <linux/mod_devicetable.h>
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/* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
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@@ -14,6 +15,7 @@
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*/
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#define MII_ADDR_C45 (1<<30)
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#define MII_DEVADDR_C45_SHIFT 16
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+#define MII_DEVADDR_C45_MASK GENMASK(20, 16)
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#define MII_REGADDR_C45_MASK GENMASK(15, 0)
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struct gpio_desc;
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@@ -342,6 +344,16 @@ static inline u32 mdiobus_c45_addr(int d
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return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
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}
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+static inline u16 mdiobus_c45_regad(u32 regnum)
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+{
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+ return FIELD_GET(MII_REGADDR_C45_MASK, regnum);
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+}
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+
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+static inline u16 mdiobus_c45_devad(u32 regnum)
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+{
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+ return FIELD_GET(MII_DEVADDR_C45_MASK, regnum);
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+}
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+
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static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
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u16 regnum)
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{
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