Date: Wed, 20 Dec 2023 01:51:01 -0300
From: Luiz Angelo Daros de Luca <luizluca@...il.com>
To: olteanv@...il.com
Cc: linus.walleij@...aro.org, alsi@...g-olufsen.dk, andrew@...n.ch, 
	f.fainelli@...il.com, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org, 
	arinc.unal@...nc9.com
Subject: Re: [PATCH net-next v2 5/7] net: dsa: realtek: Migrate user_mii_bus
 setup to realtek-dsa

Hello Vladimir,

I'm sorry to bother you again but I would like your attention for two
points that I'm not completely sure about.

> In the user MDIO driver, despite numerous references to SMI, including
> its compatible string, there's nothing inherently specific about the SMI
> interface in the user MDIO bus. Consequently, the code has been migrated
> to the common module. All references to SMI have been eliminated, with
> the exception of the compatible string, which will continue to function
> as before.
>
> The realtek-mdio will now use this driver instead of the generic DSA
> driver ("dsa user smi"), which should not be used with OF[1].
>
> There was a change in how the driver looks for the MDIO node in the
> device tree. Now, it first checks for a child node named "mdio," which
> is required by both interfaces in binding docs but used previously only
> by realtek-mdio. If the node is not found, it will also look for a
> compatible string, required only by SMI-connected devices in binding
> docs and compatible with the old realtek-smi behavior.
>
> The line assigning dev.of_node in mdio_bus has been removed since the
> subsequent of_mdiobus_register will always overwrite it.
>
> ds->user_mii_bus is only defined if all user ports do not declare a
> phy-handle, providing a warning about the erroneous device tree[2].
>
> With a single ds_ops for both interfaces, the ds_ops in realtek_priv is
> no longer necessary. Now, the realtek_variant.ds_ops can be used
> directly.
>
> The realtek_priv.setup_interface() has been removed as we can directly
> call the new common function.
>
> The switch unregistration and the MDIO node decrement in refcount were
> moved into realtek_common_remove() as both interfaces now need to put
> the MDIO node.
>
> [1] https://lkml.kernel.org/netdev/20220630200423.tieprdu5fpabflj7@bang-olufsen.dk/T/
> [2] https://lkml.kernel.org/netdev/20231213120656.x46fyad6ls7sqyzv@skbuf/T/#u
>
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
> ---
>  drivers/net/dsa/realtek/realtek-common.c | 87 +++++++++++++++++++++++-
>  drivers/net/dsa/realtek/realtek-common.h |  1 +
>  drivers/net/dsa/realtek/realtek-mdio.c   |  6 --
>  drivers/net/dsa/realtek/realtek-smi.c    | 68 ------------------
>  drivers/net/dsa/realtek/realtek.h        |  5 +-
>  drivers/net/dsa/realtek/rtl8365mb.c      | 49 ++-----------
>  drivers/net/dsa/realtek/rtl8366rb.c      | 52 ++------------
>  7 files changed, 100 insertions(+), 168 deletions(-)
>
> diff --git a/drivers/net/dsa/realtek/realtek-common.c b/drivers/net/dsa/realtek/realtek-common.c
> index bf3933a99072..b1f0095d5bce 100644
> --- a/drivers/net/dsa/realtek/realtek-common.c
> +++ b/drivers/net/dsa/realtek/realtek-common.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0+
>
>  #include <linux/module.h>
> +#include <linux/of_mdio.h>
>
>  #include "realtek.h"
>  #include "realtek-common.h"
> @@ -21,6 +22,85 @@ void realtek_common_unlock(void *ctx)
>  }
>  EXPORT_SYMBOL_GPL(realtek_common_unlock);
>
> +static int realtek_common_user_mdio_read(struct mii_bus *bus, int addr,
> +                                        int regnum)
> +{
> +       struct realtek_priv *priv = bus->priv;
> +
> +       return priv->ops->phy_read(priv, addr, regnum);
> +}
> +
> +static int realtek_common_user_mdio_write(struct mii_bus *bus, int addr,
> +                                         int regnum, u16 val)
> +{
> +       struct realtek_priv *priv = bus->priv;
> +
> +       return priv->ops->phy_write(priv, addr, regnum, val);
> +}
> +
> +int realtek_common_setup_user_mdio(struct dsa_switch *ds)
> +{
> +       const char *compatible = "realtek,smi-mdio";
> +       struct realtek_priv *priv =  ds->priv;
> +       struct device_node *phy_node;
> +       struct device_node *mdio_np;
> +       struct dsa_port *dp;
> +       int ret;
> +
> +       mdio_np = of_get_child_by_name(priv->dev->of_node, "mdio");
> +       if (!mdio_np) {
> +               mdio_np = of_get_compatible_child(priv->dev->of_node, compatible);
> +               if (!mdio_np) {
> +                       dev_err(priv->dev, "no MDIO bus node\n");
> +                       return -ENODEV;
> +               }
> +       }

I just kept the code compatible with both realtek-smi and realtek-mdio
(that was using the generic "DSA user mii"), even when it might
violate the binding docs (for SMI with a node not named "mdio").

You suggested using two new compatible strings for this driver
("realtek,rtl8365mb-mdio" and "realtek,rtl8366rb-mdio"). However, it
might still not be a good name as it is similar to the MDIO-connected
subdriver of each variant. Anyway, if possible, I would like to keep
it out of this series as it would first require a change in the
bindings before any real code change and it might add some more path
cycles.

> +       priv->user_mii_bus = devm_mdiobus_alloc(priv->dev);
> +       if (!priv->user_mii_bus) {
> +               ret = -ENOMEM;
> +               goto err_put_node;
> +       }
> +       priv->user_mii_bus->priv = priv;
> +       priv->user_mii_bus->name = "Realtek user MII";
> +       priv->user_mii_bus->read = realtek_common_user_mdio_read;
> +       priv->user_mii_bus->write = realtek_common_user_mdio_write;
> +       snprintf(priv->user_mii_bus->id, MII_BUS_ID_SIZE, "Realtek-%d",
> +                ds->index);
> +       priv->user_mii_bus->parent = priv->dev;
> +
> +       /* When OF describes the MDIO, connecting ports with phy-handle,
> +        * ds->user_mii_bus should not be used *
> +        */
> +       dsa_switch_for_each_user_port(dp, ds) {
> +               phy_node = of_parse_phandle(dp->dn, "phy-handle", 0);
> +               of_node_put(phy_node);
> +               if (phy_node)
> +                       continue;
> +
> +               dev_warn(priv->dev,
> +                        "DS user_mii_bus in use as '%s' is missing phy-handle",
> +                        dp->name);
> +               ds->user_mii_bus = priv->user_mii_bus;
> +               break;
> +       }

Does this check align with how should ds->user_mii_bus be used (in a
first step for phasing it out, at least for this driver)?

> +
> +       ret = devm_of_mdiobus_register(priv->dev, priv->user_mii_bus, mdio_np);
> +       if (ret) {
> +               dev_err(priv->dev, "unable to register MDIO bus %s\n",
> +                       priv->user_mii_bus->id);
> +               goto err_put_node;
> +       }
> +
> +       return 0;
> +
> +err_put_node:
> +       of_node_put(mdio_np);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL_GPL(realtek_common_setup_user_mdio);
> +
>  /* sets up driver private data struct, sets up regmaps, parse common device-tree
>   * properties and finally issues a hardware reset.
>   */
> @@ -108,7 +188,7 @@ int realtek_common_register_switch(struct realtek_priv *priv)
>
>         priv->ds->priv = priv;
>         priv->ds->dev = priv->dev;
> -       priv->ds->ops = priv->ds_ops;
> +       priv->ds->ops = priv->variant->ds_ops;
>         priv->ds->num_ports = priv->num_ports;
>
>         ret = dsa_register_switch(priv->ds);
> @@ -126,6 +206,11 @@ void realtek_common_remove(struct realtek_priv *priv)
>         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);
> diff --git a/drivers/net/dsa/realtek/realtek-common.h b/drivers/net/dsa/realtek/realtek-common.h
> index 518d091ff496..b1c2a50d85cd 100644
> --- a/drivers/net/dsa/realtek/realtek-common.h
> +++ b/drivers/net/dsa/realtek/realtek-common.h
> @@ -7,6 +7,7 @@
>
>  void realtek_common_lock(void *ctx);
>  void realtek_common_unlock(void *ctx);
> +int realtek_common_setup_user_mdio(struct dsa_switch *ds);
>  struct realtek_priv *
>  realtek_common_probe(struct device *dev, struct regmap_config rc,
>                      struct regmap_config rc_nolock);
> diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c
> index 967f6c1e8df0..e2b5432eeb26 100644
> --- a/drivers/net/dsa/realtek/realtek-mdio.c
> +++ b/drivers/net/dsa/realtek/realtek-mdio.c
> @@ -142,7 +142,6 @@ int realtek_mdio_probe(struct mdio_device *mdiodev)
>         priv->bus = mdiodev->bus;
>         priv->mdio_addr = mdiodev->addr;
>         priv->write_reg_noack = realtek_mdio_write;
> -       priv->ds_ops = priv->variant->ds_ops_mdio;
>
>         ret = realtek_common_register_switch(priv);
>         if (ret)
> @@ -156,11 +155,6 @@ void realtek_mdio_remove(struct mdio_device *mdiodev)
>  {
>         struct realtek_priv *priv = dev_get_drvdata(&mdiodev->dev);
>
> -       if (!priv)
> -               return;
> -
> -       dsa_unregister_switch(priv->ds);
> -
>         realtek_common_remove(priv);
>  }
>  EXPORT_SYMBOL_GPL(realtek_mdio_remove);
> diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
> index 2b2c6e34bae5..383689163057 100644
> --- a/drivers/net/dsa/realtek/realtek-smi.c
> +++ b/drivers/net/dsa/realtek/realtek-smi.c
> @@ -31,7 +31,6 @@
>  #include <linux/spinlock.h>
>  #include <linux/skbuff.h>
>  #include <linux/of.h>
> -#include <linux/of_mdio.h>
>  #include <linux/delay.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/platform_device.h>
> @@ -339,63 +338,6 @@ static const struct regmap_config realtek_smi_nolock_regmap_config = {
>         .disable_locking = true,
>  };
>
> -static int realtek_smi_mdio_read(struct mii_bus *bus, int addr, int regnum)
> -{
> -       struct realtek_priv *priv = bus->priv;
> -
> -       return priv->ops->phy_read(priv, addr, regnum);
> -}
> -
> -static int realtek_smi_mdio_write(struct mii_bus *bus, int addr, int regnum,
> -                                 u16 val)
> -{
> -       struct realtek_priv *priv = bus->priv;
> -
> -       return priv->ops->phy_write(priv, addr, regnum, val);
> -}
> -
> -static int realtek_smi_setup_mdio(struct dsa_switch *ds)
> -{
> -       struct realtek_priv *priv =  ds->priv;
> -       struct device_node *mdio_np;
> -       int ret;
> -
> -       mdio_np = of_get_compatible_child(priv->dev->of_node, "realtek,smi-mdio");
> -       if (!mdio_np) {
> -               dev_err(priv->dev, "no MDIO bus node\n");
> -               return -ENODEV;
> -       }
> -
> -       priv->user_mii_bus = devm_mdiobus_alloc(priv->dev);
> -       if (!priv->user_mii_bus) {
> -               ret = -ENOMEM;
> -               goto err_put_node;
> -       }
> -       priv->user_mii_bus->priv = priv;
> -       priv->user_mii_bus->name = "SMI user MII";
> -       priv->user_mii_bus->read = realtek_smi_mdio_read;
> -       priv->user_mii_bus->write = realtek_smi_mdio_write;
> -       snprintf(priv->user_mii_bus->id, MII_BUS_ID_SIZE, "SMI-%d",
> -                ds->index);
> -       priv->user_mii_bus->dev.of_node = mdio_np;
> -       priv->user_mii_bus->parent = priv->dev;
> -       ds->user_mii_bus = priv->user_mii_bus;
> -
> -       ret = devm_of_mdiobus_register(priv->dev, priv->user_mii_bus, mdio_np);
> -       if (ret) {
> -               dev_err(priv->dev, "unable to register MDIO bus %s\n",
> -                       priv->user_mii_bus->id);
> -               goto err_put_node;
> -       }
> -
> -       return 0;
> -
> -err_put_node:
> -       of_node_put(mdio_np);
> -
> -       return ret;
> -}
> -
>  int realtek_smi_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
> @@ -417,8 +359,6 @@ int realtek_smi_probe(struct platform_device *pdev)
>                 return PTR_ERR(priv->mdio);
>
>         priv->write_reg_noack = realtek_smi_write_reg_noack;
> -       priv->setup_interface = realtek_smi_setup_mdio;
> -       priv->ds_ops = priv->variant->ds_ops_smi;
>
>         ret = realtek_common_register_switch(priv);
>         if (ret)
> @@ -432,14 +372,6 @@ void realtek_smi_remove(struct platform_device *pdev)
>  {
>         struct realtek_priv *priv = platform_get_drvdata(pdev);
>
> -       if (!priv)
> -               return;
> -
> -       dsa_unregister_switch(priv->ds);
> -
> -       if (priv->user_mii_bus)
> -               of_node_put(priv->user_mii_bus->dev.of_node);
> -
>         realtek_common_remove(priv);
>  }
>  EXPORT_SYMBOL_GPL(realtek_smi_remove);
> diff --git a/drivers/net/dsa/realtek/realtek.h b/drivers/net/dsa/realtek/realtek.h
> index fbd0616c1df3..7af6dcc1bb24 100644
> --- a/drivers/net/dsa/realtek/realtek.h
> +++ b/drivers/net/dsa/realtek/realtek.h
> @@ -60,7 +60,6 @@ struct realtek_priv {
>
>         spinlock_t              lock; /* Locks around command writes */
>         struct dsa_switch       *ds;
> -       const struct dsa_switch_ops *ds_ops;
>         struct irq_domain       *irqdomain;
>         bool                    leds_disabled;
>
> @@ -71,7 +70,6 @@ struct realtek_priv {
>         struct rtl8366_mib_counter *mib_counters;
>
>         const struct realtek_ops *ops;
> -       int                     (*setup_interface)(struct dsa_switch *ds);
>         int                     (*write_reg_noack)(void *ctx, u32 addr, u32 data);
>
>         int                     vlan_enabled;
> @@ -115,8 +113,7 @@ struct realtek_ops {
>  };
>
>  struct realtek_variant {
> -       const struct dsa_switch_ops *ds_ops_smi;
> -       const struct dsa_switch_ops *ds_ops_mdio;
> +       const struct dsa_switch_ops *ds_ops;
>         const struct realtek_ops *ops;
>         unsigned int clk_delay;
>         u8 cmd_read;
> diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
> index 58ec057b6c32..e890ad113ba3 100644
> --- a/drivers/net/dsa/realtek/rtl8365mb.c
> +++ b/drivers/net/dsa/realtek/rtl8365mb.c
> @@ -828,17 +828,6 @@ static int rtl8365mb_phy_write(struct realtek_priv *priv, int phy, int regnum,
>         return 0;
>  }
>
> -static int rtl8365mb_dsa_phy_read(struct dsa_switch *ds, int phy, int regnum)
> -{
> -       return rtl8365mb_phy_read(ds->priv, phy, regnum);
> -}
> -
> -static int rtl8365mb_dsa_phy_write(struct dsa_switch *ds, int phy, int regnum,
> -                                  u16 val)
> -{
> -       return rtl8365mb_phy_write(ds->priv, phy, regnum, val);
> -}
> -
>  static const struct rtl8365mb_extint *
>  rtl8365mb_get_port_extint(struct realtek_priv *priv, int port)
>  {
> @@ -2017,12 +2006,10 @@ static int rtl8365mb_setup(struct dsa_switch *ds)
>         if (ret)
>                 goto out_teardown_irq;
>
> -       if (priv->setup_interface) {
> -               ret = priv->setup_interface(ds);
> -               if (ret) {
> -                       dev_err(priv->dev, "could not set up MDIO bus\n");
> -                       goto out_teardown_irq;
> -               }
> +       ret = realtek_common_setup_user_mdio(ds);
> +       if (ret) {
> +               dev_err(priv->dev, "could not set up MDIO bus\n");
> +               goto out_teardown_irq;
>         }
>
>         /* Start statistics counter polling */
> @@ -2116,28 +2103,7 @@ static int rtl8365mb_detect(struct realtek_priv *priv)
>         return 0;
>  }
>
> -static const struct dsa_switch_ops rtl8365mb_switch_ops_smi = {
> -       .get_tag_protocol = rtl8365mb_get_tag_protocol,
> -       .change_tag_protocol = rtl8365mb_change_tag_protocol,
> -       .setup = rtl8365mb_setup,
> -       .teardown = rtl8365mb_teardown,
> -       .phylink_get_caps = rtl8365mb_phylink_get_caps,
> -       .phylink_mac_config = rtl8365mb_phylink_mac_config,
> -       .phylink_mac_link_down = rtl8365mb_phylink_mac_link_down,
> -       .phylink_mac_link_up = rtl8365mb_phylink_mac_link_up,
> -       .port_stp_state_set = rtl8365mb_port_stp_state_set,
> -       .get_strings = rtl8365mb_get_strings,
> -       .get_ethtool_stats = rtl8365mb_get_ethtool_stats,
> -       .get_sset_count = rtl8365mb_get_sset_count,
> -       .get_eth_phy_stats = rtl8365mb_get_phy_stats,
> -       .get_eth_mac_stats = rtl8365mb_get_mac_stats,
> -       .get_eth_ctrl_stats = rtl8365mb_get_ctrl_stats,
> -       .get_stats64 = rtl8365mb_get_stats64,
> -       .port_change_mtu = rtl8365mb_port_change_mtu,
> -       .port_max_mtu = rtl8365mb_port_max_mtu,
> -};
> -
> -static const struct dsa_switch_ops rtl8365mb_switch_ops_mdio = {
> +static const struct dsa_switch_ops rtl8365mb_switch_ops = {
>         .get_tag_protocol = rtl8365mb_get_tag_protocol,
>         .change_tag_protocol = rtl8365mb_change_tag_protocol,
>         .setup = rtl8365mb_setup,
> @@ -2146,8 +2112,6 @@ static const struct dsa_switch_ops rtl8365mb_switch_ops_mdio = {
>         .phylink_mac_config = rtl8365mb_phylink_mac_config,
>         .phylink_mac_link_down = rtl8365mb_phylink_mac_link_down,
>         .phylink_mac_link_up = rtl8365mb_phylink_mac_link_up,
> -       .phy_read = rtl8365mb_dsa_phy_read,
> -       .phy_write = rtl8365mb_dsa_phy_write,
>         .port_stp_state_set = rtl8365mb_port_stp_state_set,
>         .get_strings = rtl8365mb_get_strings,
>         .get_ethtool_stats = rtl8365mb_get_ethtool_stats,
> @@ -2167,8 +2131,7 @@ static const struct realtek_ops rtl8365mb_ops = {
>  };
>
>  const struct realtek_variant rtl8365mb_variant = {
> -       .ds_ops_smi = &rtl8365mb_switch_ops_smi,
> -       .ds_ops_mdio = &rtl8365mb_switch_ops_mdio,
> +       .ds_ops = &rtl8365mb_switch_ops,
>         .ops = &rtl8365mb_ops,
>         .clk_delay = 10,
>         .cmd_read = 0xb9,
> diff --git a/drivers/net/dsa/realtek/rtl8366rb.c b/drivers/net/dsa/realtek/rtl8366rb.c
> index e60a0a81d426..56619aa592ec 100644
> --- a/drivers/net/dsa/realtek/rtl8366rb.c
> +++ b/drivers/net/dsa/realtek/rtl8366rb.c
> @@ -1027,12 +1027,10 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
>         if (ret)
>                 dev_info(priv->dev, "no interrupt support\n");
>
> -       if (priv->setup_interface) {
> -               ret = priv->setup_interface(ds);
> -               if (ret) {
> -                       dev_err(priv->dev, "could not set up MDIO bus\n");
> -                       return -ENODEV;
> -               }
> +       ret = realtek_common_setup_user_mdio(ds);
> +       if (ret) {
> +               dev_err(priv->dev, "could not set up MDIO bus\n");
> +               return -ENODEV;
>         }
>
>         return 0;
> @@ -1772,17 +1770,6 @@ static int rtl8366rb_phy_write(struct realtek_priv *priv, int phy, int regnum,
>         return ret;
>  }
>
> -static int rtl8366rb_dsa_phy_read(struct dsa_switch *ds, int phy, int regnum)
> -{
> -       return rtl8366rb_phy_read(ds->priv, phy, regnum);
> -}
> -
> -static int rtl8366rb_dsa_phy_write(struct dsa_switch *ds, int phy, int regnum,
> -                                  u16 val)
> -{
> -       return rtl8366rb_phy_write(ds->priv, phy, regnum, val);
> -}
> -
>  static int rtl8366rb_reset_chip(struct realtek_priv *priv)
>  {
>         int timeout = 10;
> @@ -1848,35 +1835,9 @@ static int rtl8366rb_detect(struct realtek_priv *priv)
>         return 0;
>  }
>
> -static const struct dsa_switch_ops rtl8366rb_switch_ops_smi = {
> -       .get_tag_protocol = rtl8366_get_tag_protocol,
> -       .setup = rtl8366rb_setup,
> -       .phylink_get_caps = rtl8366rb_phylink_get_caps,
> -       .phylink_mac_link_up = rtl8366rb_mac_link_up,
> -       .phylink_mac_link_down = rtl8366rb_mac_link_down,
> -       .get_strings = rtl8366_get_strings,
> -       .get_ethtool_stats = rtl8366_get_ethtool_stats,
> -       .get_sset_count = rtl8366_get_sset_count,
> -       .port_bridge_join = rtl8366rb_port_bridge_join,
> -       .port_bridge_leave = rtl8366rb_port_bridge_leave,
> -       .port_vlan_filtering = rtl8366rb_vlan_filtering,
> -       .port_vlan_add = rtl8366_vlan_add,
> -       .port_vlan_del = rtl8366_vlan_del,
> -       .port_enable = rtl8366rb_port_enable,
> -       .port_disable = rtl8366rb_port_disable,
> -       .port_pre_bridge_flags = rtl8366rb_port_pre_bridge_flags,
> -       .port_bridge_flags = rtl8366rb_port_bridge_flags,
> -       .port_stp_state_set = rtl8366rb_port_stp_state_set,
> -       .port_fast_age = rtl8366rb_port_fast_age,
> -       .port_change_mtu = rtl8366rb_change_mtu,
> -       .port_max_mtu = rtl8366rb_max_mtu,
> -};
> -
> -static const struct dsa_switch_ops rtl8366rb_switch_ops_mdio = {
> +static const struct dsa_switch_ops rtl8366rb_switch_ops = {
>         .get_tag_protocol = rtl8366_get_tag_protocol,
>         .setup = rtl8366rb_setup,
> -       .phy_read = rtl8366rb_dsa_phy_read,
> -       .phy_write = rtl8366rb_dsa_phy_write,
>         .phylink_get_caps = rtl8366rb_phylink_get_caps,
>         .phylink_mac_link_up = rtl8366rb_mac_link_up,
>         .phylink_mac_link_down = rtl8366rb_mac_link_down,
> @@ -1915,8 +1876,7 @@ static const struct realtek_ops rtl8366rb_ops = {
>  };
>
>  const struct realtek_variant rtl8366rb_variant = {
> -       .ds_ops_smi = &rtl8366rb_switch_ops_smi,
> -       .ds_ops_mdio = &rtl8366rb_switch_ops_mdio,
> +       .ds_ops = &rtl8366rb_switch_ops,
>         .ops = &rtl8366rb_ops,
>         .clk_delay = 10,
>         .cmd_read = 0xa9,
> --
> 2.43.0
>

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