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realtek: backport Clause-45 MDIO helper functions

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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>
This commit is contained in:
Daniel Golle 2022-02-01 01:44:05 +00:00
parent 0538dc693b
commit 854458f986
1 changed files with 53 additions and 0 deletions
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53
target/linux/realtek/patches-5.10/020-v5.17-net-mdio-add-helpers-to-extract-clause-45-regad-and-.patch Normal file
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@ -0,0 +1,53 @@
From c6af53f038aa32cec12e8a305ba07c7ef168f1b0 Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Tue, 4 Jan 2022 12:07:00 +0000
Subject: [PATCH 2/3] 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>
---
include/linux/mdio.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- 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;
@@ -342,6 +344,16 @@ static inline u32 mdiobus_c45_addr(int d
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)
{