Date: Tue, 14 Nov 2023 11:43:41 +0000
From: Alvin Šipraga <ALSI@...g-olufsen.dk>
To: Luiz Angelo Daros de Luca <luizluca@...il.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>, "andrew@...n.ch"
	<andrew@...n.ch>, "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>, "olteanv@...il.com"
	<olteanv@...il.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "arinc.unal@...nc9.com" <arinc.unal@...nc9.com>
Subject: Re: [RFC net-next 3/5] net: dsa: realtek: create realtek-common

On Sat, Nov 11, 2023 at 06:51:06PM -0300, Luiz Angelo Daros de Luca wrote:
> Some code can be shared between both interface modules (MDIO and SMI)
> and amongst variants. For now, these interface functions are shared:
> 
> - realtek_common_lock
> - realtek_common_unlock
> - realtek_common_probe
> - realtek_common_remove
> 
> The reset during probe was moved to the last moment before a variant
> detects the switch. This way, we avoid a reset if anything else fails.
> 
> The symbols from variants used in of_match_table are now in a single
> match table in realtek-common, used by both interfaces.
> 
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
> ---
>  drivers/net/dsa/realtek/Makefile         |   1 +
>  drivers/net/dsa/realtek/realtek-common.c | 139 +++++++++++++++++++++++
>  drivers/net/dsa/realtek/realtek-common.h |  16 +++
>  drivers/net/dsa/realtek/realtek-mdio.c   | 116 +++----------------
>  drivers/net/dsa/realtek/realtek-smi.c    | 127 +++------------------
>  drivers/net/dsa/realtek/realtek.h        |   2 +
>  6 files changed, 184 insertions(+), 217 deletions(-)
>  create mode 100644 drivers/net/dsa/realtek/realtek-common.c
>  create mode 100644 drivers/net/dsa/realtek/realtek-common.h
> 
> diff --git a/drivers/net/dsa/realtek/Makefile b/drivers/net/dsa/realtek/Makefile
> index 0aab57252a7c..5e0c1ef200a3 100644
> --- a/drivers/net/dsa/realtek/Makefile
> +++ b/drivers/net/dsa/realtek/Makefile
> @@ -1,4 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_NET_DSA_REALTEK)		+= realtek-common.o
>  obj-$(CONFIG_NET_DSA_REALTEK_MDIO) 	+= realtek-mdio.o
>  obj-$(CONFIG_NET_DSA_REALTEK_SMI) 	+= realtek-smi.o
>  obj-$(CONFIG_NET_DSA_REALTEK_RTL8366RB) += rtl8366.o
> diff --git a/drivers/net/dsa/realtek/realtek-common.c b/drivers/net/dsa/realtek/realtek-common.c
> new file mode 100644
> index 000000000000..36f8b60771be
> --- /dev/null
> +++ b/drivers/net/dsa/realtek/realtek-common.c
> @@ -0,0 +1,139 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <linux/module.h>
> +
> +#include "realtek.h"
> +#include "realtek-common.h"
> +
> +void realtek_common_lock(void *ctx)
> +{
> +	struct realtek_priv *priv = ctx;
> +
> +	mutex_lock(&priv->map_lock);
> +}
> +EXPORT_SYMBOL_GPL(realtek_common_lock);
> +
> +void realtek_common_unlock(void *ctx)
> +{
> +	struct realtek_priv *priv = ctx;
> +
> +	mutex_unlock(&priv->map_lock);
> +}
> +EXPORT_SYMBOL_GPL(realtek_common_unlock);

Shouldn't you update the raw mutex_{lock,unlock}() calls in the chip drivers to
use these common functions as well?

> +
> +struct realtek_priv *realtek_common_probe(struct device *dev,
> +		struct regmap_config rc, struct regmap_config rc_nolock)
> +{
> +	const struct realtek_variant *var;
> +	struct realtek_priv *priv;
> +	struct device_node *np;
> +	int ret;
> +
> +	var = of_device_get_match_data(dev);
> +	if (!var)
> +		return ERR_PTR(-EINVAL);
> +
> +	priv = devm_kzalloc(dev, size_add(sizeof(*priv), var->chip_data_sz),
> +			    GFP_KERNEL);
> +	if (!priv)
> +		return ERR_PTR(-ENOMEM);
> +
> +	mutex_init(&priv->map_lock);
> +
> +	rc.lock_arg = priv;
> +	priv->map = devm_regmap_init(dev, NULL, priv, &rc);
> +	if (IS_ERR(priv->map)) {
> +		ret = PTR_ERR(priv->map);
> +		dev_err(dev, "regmap init failed: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	priv->map_nolock = devm_regmap_init(dev, NULL, priv, &rc_nolock);
> +	if (IS_ERR(priv->map_nolock)) {
> +		ret = PTR_ERR(priv->map_nolock);
> +		dev_err(dev, "regmap init failed: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	/* Link forward and backward */
> +	priv->dev = dev;

> +	priv->clk_delay = var->clk_delay;
> +	priv->cmd_read = var->cmd_read;
> +	priv->cmd_write = var->cmd_write;

These are only used by the SMI interface. Since you are storing a pointer to var
in priv anyway, maybe you can remove this part and update the SMI code to use
priv->var->clk_delay etc. Because this is not really common.

The same goes for a couple of other things inside the realtek_priv struct,
e.g. mdio_addr. At the risk of making things too hairy, perhaps you could have
an interface_data pointer just like there is a chip_data pointer. Then the
per-interface stuff can be stored there and the common code is truly common.

> +	priv->variant = var;
> +	priv->ops = var->ops;
> +	priv->chip_data = (void *)priv + sizeof(*priv);
> +
> +	dev_set_drvdata(dev, priv);
> +	spin_lock_init(&priv->lock);
> +
> +	/* Fetch MDIO pins */
> +	priv->mdc = devm_gpiod_get_optional(dev, "mdc", GPIOD_OUT_LOW);
> +	if (IS_ERR(priv->mdc))
> +		return ERR_CAST(priv->mdc);
> +
> +	priv->mdio = devm_gpiod_get_optional(dev, "mdio", GPIOD_OUT_LOW);
> +	if (IS_ERR(priv->mdio))
> +		return ERR_CAST(priv->mdio);

Also not common, but specific to the SMI interface driver.

> +
> +	np = dev->of_node;
> +
> +	priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
> +
> +	/* TODO: if power is software controlled, set up any regulators here */
> +
> +	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(priv->reset)) {
> +		dev_err(dev, "failed to get RESET GPIO\n");
> +		return ERR_CAST(priv->reset);
> +	}
> +	if (priv->reset) {
> +		gpiod_set_value(priv->reset, 1);
> +		dev_dbg(dev, "asserted RESET\n");
> +		msleep(REALTEK_HW_STOP_DELAY);
> +		gpiod_set_value(priv->reset, 0);
> +		msleep(REALTEK_HW_START_DELAY);
> +		dev_dbg(dev, "deasserted RESET\n");
> +	}
> +
> +	priv->ds = devm_kzalloc(dev, sizeof(*priv->ds), GFP_KERNEL);
> +	if (!priv->ds)
> +		return ERR_PTR(-ENOMEM);
> +
> +	priv->ds->dev = dev;
> +	priv->ds->priv = priv;

Any reason why you left the assignment of ds->num_ports in the interface
drivers?

> +
> +	return priv;
> +}
> +EXPORT_SYMBOL(realtek_common_probe);
> +
> +void realtek_common_remove(struct realtek_priv *priv)
> +{
> +	if (!priv)
> +		return;
> +
> +	dsa_unregister_switch(priv->ds);

It seems a little unbalanced to me that the interface driver's probe function is
responsible for calling dsa_register_switch(), but the common code calls
dsa_unregister_switch().

I understand that you have already done a lot here - all you wanted was to
support reset controllers after all :) - so you don't need to do all this
stuff I am suggesting if you don't want to. But for the parts that you do touch,
please try to keep some balance so that subsequent refactoring is easier.

> +	if (priv->user_mii_bus)
> +		of_node_put(priv->user_mii_bus->dev.of_node);

Similarly this is only used by the SMI interface driver. I think there is a
general need for balance here - not that it was great to begin with. There is
already a setup_interface op in realtek_priv, which is called in the DSA setup
op of the chip drivers. Intuitively I would then expect a teardown_interface op
in realtek_priv to be called in the DSA teardown op of the chip drivers.

> +
> +	/* leave the device reset asserted */
> +	if (priv->reset)
> +		gpiod_set_value(priv->reset, 1);
> +}
> +EXPORT_SYMBOL(realtek_common_remove);
> +
> +const struct of_device_id realtek_common_of_match[] = {
> +#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB)
> +	{ .compatible = "realtek,rtl8366rb", .data = &rtl8366rb_variant, },
> +#endif
> +#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB)
> +	{ .compatible = "realtek,rtl8365mb", .data = &rtl8366rb_variant, },

Copy-paste error? .data = &rtl8365mb_variant.

> +#endif
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, realtek_common_of_match);
> +EXPORT_SYMBOL_GPL(realtek_common_of_match);
> +
> +MODULE_AUTHOR("Luiz Angelo Daros de Luca <luizluca@...il.com>");
> +MODULE_DESCRIPTION("Realtek DSA switches common module");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/net/dsa/realtek/realtek-common.h b/drivers/net/dsa/realtek/realtek-common.h
> new file mode 100644
> index 000000000000..90a949386518
> --- /dev/null
> +++ b/drivers/net/dsa/realtek/realtek-common.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +#ifndef _REALTEK_INTERFACE_H
> +#define _REALTEK_INTERFACE_H
> +
> +#include <linux/regmap.h>
> +
> +extern const struct of_device_id realtek_common_of_match[];
> +
> +void realtek_common_lock(void *ctx);
> +void realtek_common_unlock(void *ctx);
> +struct realtek_priv *realtek_common_probe(struct device *dev,
> +		struct regmap_config rc, struct regmap_config rc_nolock);
> +void realtek_common_remove(struct realtek_priv *priv);
> +
> +#endif
> diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c
> index 292e6d087e8b..6f610386c977 100644
> --- a/drivers/net/dsa/realtek/realtek-mdio.c
> +++ b/drivers/net/dsa/realtek/realtek-mdio.c
> @@ -25,6 +25,7 @@
>  #include <linux/regmap.h>
>  
>  #include "realtek.h"
> +#include "realtek-common.h"
>  
>  /* Read/write via mdiobus */
>  #define REALTEK_MDIO_CTRL0_REG		31
> @@ -99,20 +100,6 @@ static int realtek_mdio_read(void *ctx, u32 reg, u32 *val)
>  	return ret;
>  }
>  
> -static void realtek_mdio_lock(void *ctx)
> -{
> -	struct realtek_priv *priv = ctx;
> -
> -	mutex_lock(&priv->map_lock);
> -}
> -
> -static void realtek_mdio_unlock(void *ctx)
> -{
> -	struct realtek_priv *priv = ctx;
> -
> -	mutex_unlock(&priv->map_lock);
> -}
> -
>  static const struct regmap_config realtek_mdio_regmap_config = {
>  	.reg_bits = 10, /* A4..A0 R4..R0 */
>  	.val_bits = 16,
> @@ -123,8 +110,8 @@ static const struct regmap_config realtek_mdio_regmap_config = {
>  	.reg_read = realtek_mdio_read,
>  	.reg_write = realtek_mdio_write,
>  	.cache_type = REGCACHE_NONE,
> -	.lock = realtek_mdio_lock,
> -	.unlock = realtek_mdio_unlock,
> +	.lock = realtek_common_lock,
> +	.unlock = realtek_common_unlock,
>  };
>  
>  static const struct regmap_config realtek_mdio_nolock_regmap_config = {
> @@ -142,75 +129,19 @@ static const struct regmap_config realtek_mdio_nolock_regmap_config = {
>  
>  static int realtek_mdio_probe(struct mdio_device *mdiodev)
>  {
> -	struct realtek_priv *priv;
>  	struct device *dev = &mdiodev->dev;
> -	const struct realtek_variant *var;
> -	struct regmap_config rc;
> -	struct device_node *np;
> +	struct realtek_priv *priv;
>  	int ret;
>  
> -	var = of_device_get_match_data(dev);
> -	if (!var)
> -		return -EINVAL;
> -
> -	priv = devm_kzalloc(&mdiodev->dev,
> -			    size_add(sizeof(*priv), var->chip_data_sz),
> -			    GFP_KERNEL);
> -	if (!priv)
> -		return -ENOMEM;
> -
> -	mutex_init(&priv->map_lock);
> -
> -	rc = realtek_mdio_regmap_config;
> -	rc.lock_arg = priv;
> -	priv->map = devm_regmap_init(dev, NULL, priv, &rc);
> -	if (IS_ERR(priv->map)) {
> -		ret = PTR_ERR(priv->map);
> -		dev_err(dev, "regmap init failed: %d\n", ret);
> -		return ret;
> -	}
> -
> -	rc = realtek_mdio_nolock_regmap_config;
> -	priv->map_nolock = devm_regmap_init(dev, NULL, priv, &rc);
> -	if (IS_ERR(priv->map_nolock)) {
> -		ret = PTR_ERR(priv->map_nolock);
> -		dev_err(dev, "regmap init failed: %d\n", ret);
> -		return ret;
> -	}
> +	priv = realtek_common_probe(dev, realtek_mdio_regmap_config,
> +				    realtek_mdio_nolock_regmap_config);
> +	if (IS_ERR(priv))
> +		return PTR_ERR(priv);
>  
>  	priv->mdio_addr = mdiodev->addr;
>  	priv->bus = mdiodev->bus;
> -	priv->dev = &mdiodev->dev;
> -	priv->chip_data = (void *)priv + sizeof(*priv);
> -
> -	priv->clk_delay = var->clk_delay;
> -	priv->cmd_read = var->cmd_read;
> -	priv->cmd_write = var->cmd_write;
> -	priv->ops = var->ops;
> -
>  	priv->write_reg_noack = realtek_mdio_write;
> -
> -	np = dev->of_node;
> -
> -	dev_set_drvdata(dev, priv);
> -
> -	/* TODO: if power is software controlled, set up any regulators here */
> -	priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
> -
> -	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->reset)) {
> -		dev_err(dev, "failed to get RESET GPIO\n");
> -		return PTR_ERR(priv->reset);
> -	}
> -
> -	if (priv->reset) {
> -		gpiod_set_value(priv->reset, 1);
> -		dev_dbg(dev, "asserted RESET\n");
> -		msleep(REALTEK_HW_STOP_DELAY);
> -		gpiod_set_value(priv->reset, 0);
> -		msleep(REALTEK_HW_START_DELAY);
> -		dev_dbg(dev, "deasserted RESET\n");
> -	}
> +	priv->ds->ops = priv->variant->ds_ops_mdio;
>  
>  	ret = priv->ops->detect(priv);
>  	if (ret) {
> @@ -218,18 +149,12 @@ static int realtek_mdio_probe(struct mdio_device *mdiodev)
>  		return ret;
>  	}
>  
> -	priv->ds = devm_kzalloc(dev, sizeof(*priv->ds), GFP_KERNEL);
> -	if (!priv->ds)
> -		return -ENOMEM;
> -
> -	priv->ds->dev = dev;
>  	priv->ds->num_ports = priv->num_ports;
> -	priv->ds->priv = priv;
> -	priv->ds->ops = var->ds_ops_mdio;
>  
>  	ret = dsa_register_switch(priv->ds);
>  	if (ret) {
> -		dev_err(priv->dev, "unable to register switch ret = %d\n", ret);
> +		dev_err_probe(dev, ret, "unable to register switch ret = %pe\n",
> +			      ERR_PTR(ret));
>  		return ret;
>  	}
>  
> @@ -243,11 +168,7 @@ static void realtek_mdio_remove(struct mdio_device *mdiodev)
>  	if (!priv)
>  		return;
>  
> -	dsa_unregister_switch(priv->ds);
> -
> -	/* leave the device reset asserted */
> -	if (priv->reset)
> -		gpiod_set_value(priv->reset, 1);
> +	realtek_common_remove(priv);
>  }
>  
>  static void realtek_mdio_shutdown(struct mdio_device *mdiodev)
> @@ -262,21 +183,10 @@ static void realtek_mdio_shutdown(struct mdio_device *mdiodev)
>  	dev_set_drvdata(&mdiodev->dev, NULL);
>  }
>  
> -static const struct of_device_id realtek_mdio_of_match[] = {
> -#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB)
> -	{ .compatible = "realtek,rtl8366rb", .data = &rtl8366rb_variant, },
> -#endif
> -#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB)
> -	{ .compatible = "realtek,rtl8365mb", .data = &rtl8365mb_variant, },
> -#endif
> -	{ /* sentinel */ },
> -};
> -MODULE_DEVICE_TABLE(of, realtek_mdio_of_match);
> -
>  static struct mdio_driver realtek_mdio_driver = {
>  	.mdiodrv.driver = {
>  		.name = "realtek-mdio",
> -		.of_match_table = realtek_mdio_of_match,
> +		.of_match_table = realtek_common_of_match,
>  	},
>  	.probe  = realtek_mdio_probe,
>  	.remove = realtek_mdio_remove,
> diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
> index 755546ed8db6..0cf89f9db99e 100644
> --- a/drivers/net/dsa/realtek/realtek-smi.c
> +++ b/drivers/net/dsa/realtek/realtek-smi.c
> @@ -40,6 +40,7 @@
>  #include <linux/if_bridge.h>
>  
>  #include "realtek.h"
> +#include "realtek-common.h"
>  
>  #define REALTEK_SMI_ACK_RETRY_COUNT		5
>  
> @@ -310,20 +311,6 @@ static int realtek_smi_read(void *ctx, u32 reg, u32 *val)
>  	return realtek_smi_read_reg(priv, reg, val);
>  }
>  
> -static void realtek_smi_lock(void *ctx)
> -{
> -	struct realtek_priv *priv = ctx;
> -
> -	mutex_lock(&priv->map_lock);
> -}
> -
> -static void realtek_smi_unlock(void *ctx)
> -{
> -	struct realtek_priv *priv = ctx;
> -
> -	mutex_unlock(&priv->map_lock);
> -}
> -
>  static const struct regmap_config realtek_smi_regmap_config = {
>  	.reg_bits = 10, /* A4..A0 R4..R0 */
>  	.val_bits = 16,
> @@ -334,8 +321,8 @@ static const struct regmap_config realtek_smi_regmap_config = {
>  	.reg_read = realtek_smi_read,
>  	.reg_write = realtek_smi_write,
>  	.cache_type = REGCACHE_NONE,
> -	.lock = realtek_smi_lock,
> -	.unlock = realtek_smi_unlock,
> +	.lock = realtek_common_lock,
> +	.unlock = realtek_common_unlock,
>  };
>  
>  static const struct regmap_config realtek_smi_nolock_regmap_config = {
> @@ -410,78 +397,18 @@ static int realtek_smi_setup_mdio(struct dsa_switch *ds)
>  
>  static int realtek_smi_probe(struct platform_device *pdev)
>  {
> -	const struct realtek_variant *var;
>  	struct device *dev = &pdev->dev;
>  	struct realtek_priv *priv;
> -	struct regmap_config rc;
> -	struct device_node *np;
>  	int ret;
>  
> -	var = of_device_get_match_data(dev);
> -	np = dev->of_node;
> -
> -	priv = devm_kzalloc(dev, sizeof(*priv) + var->chip_data_sz, GFP_KERNEL);
> -	if (!priv)
> -		return -ENOMEM;
> -	priv->chip_data = (void *)priv + sizeof(*priv);
> -
> -	mutex_init(&priv->map_lock);
> -
> -	rc = realtek_smi_regmap_config;
> -	rc.lock_arg = priv;
> -	priv->map = devm_regmap_init(dev, NULL, priv, &rc);
> -	if (IS_ERR(priv->map)) {
> -		ret = PTR_ERR(priv->map);
> -		dev_err(dev, "regmap init failed: %d\n", ret);
> -		return ret;
> -	}
> -
> -	rc = realtek_smi_nolock_regmap_config;
> -	priv->map_nolock = devm_regmap_init(dev, NULL, priv, &rc);
> -	if (IS_ERR(priv->map_nolock)) {
> -		ret = PTR_ERR(priv->map_nolock);
> -		dev_err(dev, "regmap init failed: %d\n", ret);
> -		return ret;
> -	}
> -
> -	/* Link forward and backward */
> -	priv->dev = dev;
> -	priv->clk_delay = var->clk_delay;
> -	priv->cmd_read = var->cmd_read;
> -	priv->cmd_write = var->cmd_write;
> -	priv->ops = var->ops;
> +	priv = realtek_common_probe(dev, realtek_smi_regmap_config,
> +				    realtek_smi_nolock_regmap_config);
> +	if (IS_ERR(priv))
> +		return PTR_ERR(priv);
>  
>  	priv->setup_interface = realtek_smi_setup_mdio;
>  	priv->write_reg_noack = realtek_smi_write_reg_noack;
> -
> -	dev_set_drvdata(dev, priv);
> -	spin_lock_init(&priv->lock);
> -
> -	/* TODO: if power is software controlled, set up any regulators here */
> -
> -	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->reset)) {
> -		dev_err(dev, "failed to get RESET GPIO\n");
> -		return PTR_ERR(priv->reset);
> -	}
> -	if (priv->reset) {
> -		gpiod_set_value(priv->reset, 1);
> -		dev_dbg(dev, "asserted RESET\n");
> -		msleep(REALTEK_HW_STOP_DELAY);
> -		gpiod_set_value(priv->reset, 0);
> -		msleep(REALTEK_HW_START_DELAY);
> -		dev_dbg(dev, "deasserted RESET\n");
> -	}
> -
> -	/* Fetch MDIO pins */
> -	priv->mdc = devm_gpiod_get_optional(dev, "mdc", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->mdc))
> -		return PTR_ERR(priv->mdc);
> -	priv->mdio = devm_gpiod_get_optional(dev, "mdio", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->mdio))
> -		return PTR_ERR(priv->mdio);
> -
> -	priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
> +	priv->ds->ops = priv->variant->ds_ops_smi;
>  
>  	ret = priv->ops->detect(priv);
>  	if (ret) {
> @@ -489,20 +416,15 @@ static int realtek_smi_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	priv->ds = devm_kzalloc(dev, sizeof(*priv->ds), GFP_KERNEL);
> -	if (!priv->ds)
> -		return -ENOMEM;
> -
> -	priv->ds->dev = dev;
>  	priv->ds->num_ports = priv->num_ports;
> -	priv->ds->priv = priv;
>  
> -	priv->ds->ops = var->ds_ops_smi;
>  	ret = dsa_register_switch(priv->ds);
>  	if (ret) {
> -		dev_err_probe(dev, ret, "unable to register switch\n");
> +		dev_err_probe(dev, ret, "unable to register switch ret = %pe\n",
> +			      ERR_PTR(ret));
>  		return ret;
>  	}
> +
>  	return 0;
>  }
>  
> @@ -513,13 +435,7 @@ static void realtek_smi_remove(struct platform_device *pdev)
>  	if (!priv)
>  		return;
>  
> -	dsa_unregister_switch(priv->ds);
> -	if (priv->user_mii_bus)
> -		of_node_put(priv->user_mii_bus->dev.of_node);
> -
> -	/* leave the device reset asserted */
> -	if (priv->reset)
> -		gpiod_set_value(priv->reset, 1);
> +	realtek_common_remove(priv);
>  }
>  
>  static void realtek_smi_shutdown(struct platform_device *pdev)
> @@ -534,27 +450,10 @@ static void realtek_smi_shutdown(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, NULL);
>  }
>  
> -static const struct of_device_id realtek_smi_of_match[] = {
> -#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB)
> -	{
> -		.compatible = "realtek,rtl8366rb",
> -		.data = &rtl8366rb_variant,
> -	},
> -#endif
> -#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB)
> -	{
> -		.compatible = "realtek,rtl8365mb",
> -		.data = &rtl8365mb_variant,
> -	},
> -#endif
> -	{ /* sentinel */ },
> -};
> -MODULE_DEVICE_TABLE(of, realtek_smi_of_match);
> -
>  static struct platform_driver realtek_smi_driver = {
>  	.driver = {
>  		.name = "realtek-smi",
> -		.of_match_table = realtek_smi_of_match,
> +		.of_match_table = realtek_common_of_match,
>  	},
>  	.probe  = realtek_smi_probe,
>  	.remove_new = realtek_smi_remove,
> diff --git a/drivers/net/dsa/realtek/realtek.h b/drivers/net/dsa/realtek/realtek.h
> index 790488e9c667..8d9d546bf5f5 100644
> --- a/drivers/net/dsa/realtek/realtek.h
> +++ b/drivers/net/dsa/realtek/realtek.h
> @@ -79,6 +79,8 @@ struct realtek_priv {
>  	int			vlan_enabled;
>  	int			vlan4k_enabled;
>  
> +	const struct realtek_variant *variant;
> +
>  	char			buf[4096];
>  	void			*chip_data; /* Per-chip extra variant data */
>  };
> -- 
> 2.42.1
>

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