generic: backport Realtek PHY patches from upstream

Adds patches for the temperature sensor on RTL822x.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

package/kernel/linux/modules/netdevices.mk

@@ -447,9 +447,10 @@ $(eval $(call KernelPackage,phy-micrel))
 define KernelPackage/phy-realtek
    SUBMENU:=$(NETWORK_DEVICES_MENU)
    TITLE:=Realtek Ethernet PHY driver
-   KCONFIG:=CONFIG_REALTEK_PHY
-   DEPENDS:=+kmod-libphy
-   FILES:=$(LINUX_DIR)/drivers/net/phy/realtek.ko
+   KCONFIG:=CONFIG_REALTEK_PHY \
+    CONFIG_REALTEK_PHY_HWMON=y
+   DEPENDS:=+kmod-libphy +kmod-hwmon-core
+   FILES:=$(LINUX_DIR)/drivers/net/phy/realtek/realtek.ko
    AUTOLOAD:=$(call AutoLoad,18,realtek,1)
 endef
 

target/linux/generic/backport-6.6/781-20-v6.14-net-phy-realtek-add-support-for-reading-MDIO_MMD_VEN.patch

@@ -0,0 +1,47 @@
+From 3d483a10327f38595f714f9f9e9dde43a622cb0f Mon Sep 17 00:00:00 2001
+From: Heiner Kallweit <hkallweit1@gmail.com>
+Date: Sat, 11 Jan 2025 21:49:31 +0100
+Subject: [PATCH] net: phy: realtek: add support for reading MDIO_MMD_VEND2
+ regs on RTL8125/RTL8126
+
+RTL8125/RTL8126 don't support MMD access to the internal PHY, but
+provide a mechanism to access at least all MDIO_MMD_VEND2 registers.
+By exposing this mechanism standard MMD access functions can be used
+to access the MDIO_MMD_VEND2 registers.
+
+Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Link: https://patch.msgid.link/e821b302-5fe6-49ab-aabd-05da500581c0@gmail.com
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/phy/realtek.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/phy/realtek.c
++++ b/drivers/net/phy/realtek.c
+@@ -736,7 +736,11 @@ static int rtlgen_read_mmd(struct phy_de
+ {
+ 	int ret;
+
+-	if (devnum == MDIO_MMD_PCS && regnum == MDIO_PCS_EEE_ABLE) {
++	if (devnum == MDIO_MMD_VEND2) {
++		rtl821x_write_page(phydev, regnum >> 4);
++		ret = __phy_read(phydev, 0x10 + ((regnum & 0xf) >> 1));
++		rtl821x_write_page(phydev, 0);
++	} else if (devnum == MDIO_MMD_PCS && regnum == MDIO_PCS_EEE_ABLE) {
+ 		rtl821x_write_page(phydev, 0xa5c);
+ 		ret = __phy_read(phydev, 0x12);
+ 		rtl821x_write_page(phydev, 0);
+@@ -760,7 +764,11 @@ static int rtlgen_write_mmd(struct phy_d
+ {
+ 	int ret;
+
+-	if (devnum == MDIO_MMD_AN && regnum == MDIO_AN_EEE_ADV) {
++	if (devnum == MDIO_MMD_VEND2) {
++		rtl821x_write_page(phydev, regnum >> 4);
++		ret = __phy_write(phydev, 0x10 + ((regnum & 0xf) >> 1), val);
++		rtl821x_write_page(phydev, 0);
++	} else if (devnum == MDIO_MMD_AN && regnum == MDIO_AN_EEE_ADV) {
+ 		rtl821x_write_page(phydev, 0xa5d);
+ 		ret = __phy_write(phydev, 0x10, val);
+ 		rtl821x_write_page(phydev, 0);