[openwrt/openwrt] realtek: 6.6: copy patch net-phy-add-an-MDIO-SMBus-library

[LEDE Commits]

svanheule pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/850d64da96f337078f796a353f6f27db59d7a702

commit 850d64da96f337078f796a353f6f27db59d7a702
Author: Markus Stockhausen <markus.stockhausen at gmx.de>
AuthorDate: Mon Sep 9 03:56:38 2024 -0400

    realtek: 6.6: copy patch net-phy-add-an-MDIO-SMBus-library
    
    Copy the patch file to 6.6. Reorder it in the 7xx range.
    
    Signed-off-by: Markus Stockhausen <markus.stockhausen at gmx.de>
---
 .../712-net-phy-add-an-MDIO-SMBus-library.patch    | 148 +++++++++++++++++++++
 1 file changed, 148 insertions(+)

diff --git a/target/linux/realtek/patches-6.6/712-net-phy-add-an-MDIO-SMBus-library.patch b/target/linux/realtek/patches-6.6/712-net-phy-add-an-MDIO-SMBus-library.patch
new file mode 100644
index 0000000000..767a5d8ec5
--- /dev/null
+++ b/target/linux/realtek/patches-6.6/712-net-phy-add-an-MDIO-SMBus-library.patch
@@ -0,0 +1,148 @@
+From d585c55b9f70cf9e8c66820d7efe7130c683f19e Mon Sep 17 00:00:00 2001
+From: Antoine Tenart <antoine.tenart at bootlin.com>
+Date: Fri, 21 Feb 2020 11:51:27 +0100
+Subject: [PATCH 2/3] net: phy: add an MDIO SMBus library
+
+Signed-off-by: Antoine Tenart <antoine.tenart at bootlin.com>
+---
+ drivers/net/mdio/Kconfig      | 11 +++++++
+ drivers/net/mdio/Makefile     |  1 +
+ drivers/net/mdio/mdio-smbus.c | 62 +++++++++++++++++++++++++++++++++++
+ drivers/net/phy/Kconfig       |  1 +
+ include/linux/mdio/mdio-i2c.h | 16 +++++++++
+ 5 files changed, 91 insertions(+)
+ create mode 100644 drivers/net/mdio/mdio-smbus.c
+
+--- a/drivers/net/mdio/Kconfig
++++ b/drivers/net/mdio/Kconfig
+@@ -54,6 +54,17 @@ config MDIO_SUN4I
+ 	  interface units of the Allwinner SoC that have an EMAC (A10,
+ 	  A12, A10s, etc.)
+ 
++config MDIO_SMBUS
++	tristate
++	depends on I2C_SMBUS
++	help
++	  Support SMBus based PHYs. This provides a MDIO bus bridged
++	  to SMBus to allow PHYs connected in SMBus mode to be accessed
++	  using the existing infrastructure.
++
++	  This is library mode.
++
++
+ config MDIO_XGENE
+ 	tristate "APM X-Gene SoC MDIO bus controller"
+ 	depends on ARCH_XGENE || COMPILE_TEST
+--- a/drivers/net/mdio/Makefile
++++ b/drivers/net/mdio/Makefile
+@@ -19,6 +19,7 @@ obj-$(CONFIG_MDIO_MOXART)		+= mdio-moxar
+ obj-$(CONFIG_MDIO_MSCC_MIIM)		+= mdio-mscc-miim.o
+ obj-$(CONFIG_MDIO_MVUSB)		+= mdio-mvusb.o
+ obj-$(CONFIG_MDIO_OCTEON)		+= mdio-octeon.o
++obj-$(CONFIG_MDIO_SMBUS)		+= mdio-smbus.o
+ obj-$(CONFIG_MDIO_SUN4I)		+= mdio-sun4i.o
+ obj-$(CONFIG_MDIO_THUNDER)		+= mdio-thunder.o
+ obj-$(CONFIG_MDIO_XGENE)		+= mdio-xgene.o
+--- /dev/null
++++ b/drivers/net/mdio/mdio-smbus.c
+@@ -0,0 +1,62 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * MDIO SMBus bridge
++ *
++ * Copyright (C) 2020 Antoine Tenart
++ *
++ * Network PHYs can appear on SMBus when they are part of SFP modules.
++ */
++#include <linux/i2c.h>
++#include <linux/phy.h>
++#include <linux/mdio/mdio-i2c.h>
++
++static int smbus_mii_read(struct mii_bus *mii, int phy_id, int reg)
++{
++	struct i2c_adapter *i2c = mii->priv;
++	union i2c_smbus_data data;
++	int ret;
++
++	ret = i2c_smbus_xfer(i2c, i2c_mii_phy_addr(phy_id), 0, I2C_SMBUS_READ,
++			     reg, I2C_SMBUS_BYTE_DATA, &data);
++	if (ret < 0)
++		return 0xff;
++
++	return data.byte;
++}
++
++static int smbus_mii_write(struct mii_bus *mii, int phy_id, int reg, u16 val)
++{
++	struct i2c_adapter *i2c = mii->priv;
++	union i2c_smbus_data data;
++	int ret;
++
++	data.byte = val;
++
++	ret = i2c_smbus_xfer(i2c, i2c_mii_phy_addr(phy_id), 0, I2C_SMBUS_WRITE,
++			     reg, I2C_SMBUS_BYTE_DATA, &data);
++	return ret < 0 ? ret : 0;
++}
++
++struct mii_bus *mdio_smbus_alloc(struct device *parent, struct i2c_adapter *i2c)
++{
++	struct mii_bus *mii;
++
++	if (!i2c_check_functionality(i2c, I2C_FUNC_SMBUS_BYTE_DATA))
++		return ERR_PTR(-EINVAL);
++
++	mii = mdiobus_alloc();
++	if (!mii)
++		return ERR_PTR(-ENOMEM);
++
++	snprintf(mii->id, MII_BUS_ID_SIZE, "smbus:%s", dev_name(parent));
++	mii->parent = parent;
++	mii->read = smbus_mii_read;
++	mii->write = smbus_mii_write;
++	mii->priv = i2c;
++
++	return mii;
++}
++
++MODULE_AUTHOR("Antoine Tenart");
++MODULE_DESCRIPTION("MDIO SMBus bridge library");
++MODULE_LICENSE("GPL");
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -61,6 +61,7 @@ config SFP
+ 	depends on I2C && PHYLINK
+ 	depends on HWMON || HWMON=n
+ 	select MDIO_I2C
++	select MDIO_SMBUS
+ 
+ comment "Switch configuration API + drivers"
+ 
+--- a/include/linux/mdio/mdio-i2c.h
++++ b/include/linux/mdio/mdio-i2c.h
+@@ -12,5 +12,8 @@ struct i2c_adapter;
+ struct mii_bus;
+ 
+ struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c);
++struct mii_bus *mdio_smbus_alloc(struct device *parent, struct i2c_adapter *i2c);
++bool i2c_mii_valid_phy_id(int phy_id);
++unsigned int i2c_mii_phy_addr(int phy_id);
+ 
+ #endif
+--- a/drivers/net/mdio/mdio-i2c.c
++++ b/drivers/net/mdio/mdio-i2c.c
+@@ -18,12 +18,12 @@
+  * specified to be present in SFP modules.  These correspond with PHY
+  * addresses 16 and 17.  Disallow access to these "phy" addresses.
+  */
+-static bool i2c_mii_valid_phy_id(int phy_id)
++bool i2c_mii_valid_phy_id(int phy_id)
+ {
+ 	return phy_id != 0x10 && phy_id != 0x11;
+ }
+ 
+-static unsigned int i2c_mii_phy_addr(int phy_id)
++unsigned int i2c_mii_phy_addr(int phy_id)
+ {
+ 	return phy_id + 0x40;
+ }