Re: [PATCH 4/4] net: dsa: soce: Add initial driver support for MRS switches

[Vasilij Strassheim <v.strassheim@linutronix.de>]

On Wed, 2026-07-29 at 19:31 +0200, Andrew Lunn wrote:
> > +static int soce_sw_probe(struct mdio_device *mdiodev)
> > +{
> > +	const struct soce_variant_desc *variant;
> > +	struct device *dev = &mdiodev->dev;
> > +	struct device_node *switch_node;
> > +	struct soce_dsa_local *local;
> > +	const char *soce_compatible;
> > +	struct soce_priv *priv;
> > +	u32 numports;
> > +	int ret;
> > +
> > +	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return -ENOMEM;
> > +
> > +	priv->ds = devm_kzalloc(&mdiodev->dev, sizeof(*priv->ds), GFP_KERNEL);
> > +	if (!priv->ds)
> > +		return -ENOMEM;
> > +
> > +	priv->ds->dev = dev;
> > +	priv->ds->priv = priv;
> > +	local = &priv->local;
> > +
> > +	switch_node = of_parse_phandle(dev->of_node, "soce,switch-ip", 0);
> > +	if (!switch_node) {
> > +		dev_err(dev, "missing or invalid switch IP reference\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = of_property_read_string(switch_node, "compatible",
> > +				      &soce_compatible);
> > +	if (ret) {
> > +		dev_err(dev, "missing compatible property in %pOF\n",
> > +			switch_node);
> > +		of_node_put(switch_node);
> > +		return -EINVAL;
> > +	}
> > +
> > +	variant = soce_match_variant(soce_compatible);
> > +	if (!variant) {
> > +		dev_err(dev, "unsupported compatible '%s' in %pOF\n",
> > +			soce_compatible, switch_node);
> > +		of_node_put(switch_node);
> > +		return -ENODEV;
> > +	}
> > +
> > +	ret = of_property_read_u32(switch_node, "soce,num-ports", &numports);
> > +	if (ret) {
> > +		dev_err(dev, "missing soce,num-ports in %pOF\n", switch_node);
> > +		of_node_put(switch_node);
> > +		return -EINVAL;
> > +	}
> > +	if (numports == 0 || numports > SOCE_MAX_NUM_PORTS) {
> > +		dev_err(dev, "invalid soce,num-ports %u (max %d)\n", numports,
> > +			SOCE_MAX_NUM_PORTS);
> > +		of_node_put(switch_node);
> > +		return -EINVAL;
> > +	}
> > +
> > +	local->base_addr = devm_of_iomap(dev, switch_node, 0, NULL);
> > +	if (IS_ERR(local->base_addr)) {
> > +		dev_err(dev, "failed to map switch register space for %pOF\n",
> > +			switch_node);
> > +		of_node_put(switch_node);
> > +		return PTR_ERR(local->base_addr);
> > +	}
> > +
> > +	priv->ds->ops = &soce_switch_ops;
> > +	local->mdio_ops = variant->mdio_ops;
> > +	local->mdio_master_addr =
> > +		local->base_addr + variant->mdio_master_offset;
> > +	local->layout = variant->layout;
> > +	of_node_put(switch_node);
> > +
> > +	priv->ds->num_ports = numports;
> > +	ret = soce_sw_parse_port_mdio(priv, dev, numports);
> > +	if (ret)
> > +		return ret;
> > +
> > +	dev_set_drvdata(&mdiodev->dev, priv);
> > +
> > +	dev_info(dev, "soce %s SDSA driver probed.\n", soce_compatible);
> > +
> > +	return dsa_register_switch(priv->ds);
> > +}
> 
> Looking at this struct mdio_device *mdiodev is not used, other than
> for ->dev. Is this device actually on an MDIO bus?

I only have a memory-mapped version to test. I will remove this *mdiodev in
the next version.

> 
> 	Andrew

Thanks,
Vasilij