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@@ -0,0 +1,193 @@
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+From c7ddb74c981c1a29bad82d555d08724aca93b687 Mon Sep 17 00:00:00 2001
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+From: Sander Vanheule <[email protected]>
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+Date: Fri, 27 Dec 2024 14:55:31 +0100
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+Subject: [PATCH] net: mdio: Add Realtek Otto auxiliary controller
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+
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+SoCs in Realtek's Otto platform such as the RTL8380 and RTL8391 have a
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+simple auxiliary MDIO controller that is commonly used to manage RTL8231
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+GPIO expanders on switch devices.
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+
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+Add a new MDIO controller driver supporting the RTL838x (maple) and
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+RTL839x (cypress) SoCs.
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+
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+Signed-off-by: Sander Vanheule <[email protected]>
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+---
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+ drivers/net/mdio/Kconfig | 10 ++
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+ drivers/net/mdio/Makefile | 1 +
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+ drivers/net/mdio/mdio-realtek-otto-aux.c | 129 +++++++++++++++++++++++
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+ 3 files changed, 140 insertions(+)
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+ create mode 100644 drivers/net/mdio/mdio-realtek-otto-aux.c
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+
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+--- a/drivers/net/mdio/Kconfig
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++++ b/drivers/net/mdio/Kconfig
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+@@ -207,6 +207,16 @@ config MDIO_REGMAP
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+ regmap. Users willing to use this driver must explicitly select
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+ REGMAP.
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+
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++config MDIO_REALTEK_OTTO_AUX
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++ tristate "Realtek Otto auxiliary MDIO interface support"
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++ default MACH_REALTEK_RTL
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++ depends on MACH_REALTEK_RTL
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++ depends on MFD_SYSCON
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++ select MDIO_DEVRES
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++ help
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++ This driver supports the auxilairy MDIO bus on RTL838x SoCs. This bus
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++ is typically used to attach RTL8231 GPIO extenders.
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++
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+ config MDIO_THUNDER
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+ tristate "ThunderX SOCs MDIO buses"
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+ depends on 64BIT
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+--- a/drivers/net/mdio/Makefile
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++++ b/drivers/net/mdio/Makefile
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+@@ -20,6 +20,7 @@ obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-ms
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+ obj-$(CONFIG_MDIO_MVUSB) += mdio-mvusb.o
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+ obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
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+ obj-$(CONFIG_MDIO_REGMAP) += mdio-regmap.o
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++obj-$(CONFIG_MDIO_REALTEK_OTTO_AUX) += mdio-realtek-otto-aux.o
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+ obj-$(CONFIG_MDIO_SMBUS) += mdio-smbus.o
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+ obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
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+ obj-$(CONFIG_MDIO_THUNDER) += mdio-thunder.o
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+--- /dev/null
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++++ b/drivers/net/mdio/mdio-realtek-otto-aux.c
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+@@ -0,0 +1,141 @@
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++// SPDX-License-Identifier: GPL-2.0-or-later
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++
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++#include <linux/mfd/core.h>
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++#include <linux/mfd/syscon.h>
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++#include <linux/module.h>
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++#include <linux/of.h>
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++#include <linux/of_mdio.h>
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++#include <linux/of_platform.h>
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++#include <linux/phy.h>
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++#include <linux/platform_device.h>
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++#include <linux/regmap.h>
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++
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++#define RTL8380_EXT_GPIO_INDIRECT_ACCESS 0xA09C
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++#define RTL8390_EXT_GPIO_INDIRECT_ACCESS 0x0224
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++
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++#define RTL83XX_AUX_MDIO_DATA GENMASK(31, 16)
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++#define RTL83XX_AUX_MDIO_REG GENMASK(11, 7)
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++#define RTL83XX_AUX_MDIO_PHY_ADDR GENMASK(6, 2)
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++#define RTL83XX_AUX_MDIO_WRITE BIT(1)
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++#define RTL83XX_AUX_MDIO_READ 0
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++#define RTL83XX_AUX_MDIO_EXEC BIT(0)
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++
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++struct realtek_aux_mdio_ctrl {
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++ struct device *dev;
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++ struct regmap *map;
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++ unsigned int cmd_reg;
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++};
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++
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++#define mii_bus_to_ctrl(bus) ((struct realtek_aux_mdio_ctrl *) bus->priv)
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++
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++static int rtl83xx_aux_mdio_cmd(struct realtek_aux_mdio_ctrl *ctrl, int addr, int regnum,
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++ u32 rw_bit, u16 *data)
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++{
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++ unsigned int mask_volatile;
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++ unsigned int cmd;
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++ unsigned int run;
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++ int err;
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++
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++ cmd = rw_bit | RTL83XX_AUX_MDIO_EXEC;
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++ cmd |= FIELD_PREP(RTL83XX_AUX_MDIO_PHY_ADDR, addr);
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++ cmd |= FIELD_PREP(RTL83XX_AUX_MDIO_REG, regnum);
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++
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++ mask_volatile = RTL83XX_AUX_MDIO_EXEC;
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++
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++ if (rw_bit == RTL83XX_AUX_MDIO_WRITE)
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++ cmd |= FIELD_PREP(RTL83XX_AUX_MDIO_DATA, *data);
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++ else
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++ mask_volatile |= RTL83XX_AUX_MDIO_DATA;
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++
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++ err = regmap_write(ctrl->map, ctrl->cmd_reg, cmd);
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++ if (err)
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++ return err;
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++
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++ err = regmap_read_poll_timeout(ctrl->map, ctrl->cmd_reg, run, (run != cmd), 3, 100);
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++
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++ if ((run & ~mask_volatile) != (cmd & ~mask_volatile)) {
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++ dev_err(ctrl->dev, "Command modified. Is offloading still active?");
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++ return -EIO;
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++ }
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++
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++ if (!err && (rw_bit == RTL83XX_AUX_MDIO_READ))
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++ *data = FIELD_GET(RTL83XX_AUX_MDIO_DATA, run);
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++
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++ return err;
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++}
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++
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++static int rtl83xx_aux_mdio_read(struct mii_bus *bus, int addr, int regnum)
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++{
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++ struct realtek_aux_mdio_ctrl *ctrl = mii_bus_to_ctrl(bus);
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++ u16 data;
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++ int err;
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++
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++ err = rtl83xx_aux_mdio_cmd(ctrl, addr, regnum, RTL83XX_AUX_MDIO_READ, &data);
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++
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++ if (err)
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++ return err;
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++ else
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++ return data;
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++}
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++
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++static int rtl83xx_aux_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
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++{
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++ struct realtek_aux_mdio_ctrl *ctrl = mii_bus_to_ctrl(bus);
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++
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++ return rtl83xx_aux_mdio_cmd(ctrl, addr, regnum, RTL83XX_AUX_MDIO_WRITE, &val);
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++}
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++
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++static int realtek_aux_mdio_probe(struct platform_device *pdev)
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++{
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++ struct device_node *np = pdev->dev.of_node;
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++ struct realtek_aux_mdio_ctrl *ctrl;
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++ struct mii_bus *bus;
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++
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++ bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*ctrl));
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++ if (!bus)
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++ return -ENOMEM;
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++
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++ ctrl = bus->priv;
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++ ctrl->dev = &pdev->dev;
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++ ctrl->cmd_reg = (unsigned int) device_get_match_data(ctrl->dev);
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++ ctrl->map = syscon_node_to_regmap(np->parent);
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++ if (IS_ERR(ctrl->map))
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++ return PTR_ERR(ctrl->map);
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++
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++ bus->name = "RTL83xx auxiliary MDIO bus";
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++ snprintf(bus->id, MII_BUS_ID_SIZE, "rtl83xx-aux-mdio") ;
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++ bus->parent = ctrl->dev;
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++ bus->read = rtl83xx_aux_mdio_read;
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++ bus->write = rtl83xx_aux_mdio_write;
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++ /* Don't have interrupts */
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++ for (unsigned int i = 0; i < PHY_MAX_ADDR; i++)
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++ bus->irq[i] = PHY_POLL;
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++
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++ return devm_of_mdiobus_register(ctrl->dev, bus, np);
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++}
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++
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++static const struct of_device_id realtek_aux_mdio_of_match[] = {
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++ {
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++ .compatible = "realtek,rtl8380-aux-mdio",
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++ .data = (void *) RTL8380_EXT_GPIO_INDIRECT_ACCESS,
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++ },
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++ {
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++ .compatible = "realtek,rtl8390-aux-mdio",
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++ .data = (void *) RTL8390_EXT_GPIO_INDIRECT_ACCESS,
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++ },
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++ { /* sentinel */ }
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++};
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++MODULE_DEVICE_TABLE(of, realtek_aux_mdio_of_match);
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++
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++static struct platform_driver realtek_aux_mdio_driver = {
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++ .driver = {
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++ .name = "realtek-otto-aux-mdio",
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++ .of_match_table = realtek_aux_mdio_of_match
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++ },
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++ .probe = realtek_aux_mdio_probe,
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++};
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++module_platform_driver(realtek_aux_mdio_driver);
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++
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++MODULE_AUTHOR("Sander Vanheule <[email protected]>");
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++MODULE_DESCRIPTION("Realtek RTL83xx auxiliary MDIO bus");
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++MODULE_LICENSE("GPL v2");
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Sander Vanheule