[PATCH net-next RESEND] net: dsa: OF-ware slave_mii_bus

[PATCH net-next RESEND] net: dsa: OF-ware slave_mii_bus

[Luiz Angelo Daros de Luca]

If found, register the DSA internally allocated slave_mii_bus with an OF
"mdio" child object. It can save some drivers from creating their
custom internal MDIO bus.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 net/dsa/dsa2.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index d0a2452a1e24..cac48a741f27 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/rtnetlink.h>
 #include <linux/of.h>
+#include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <net/devlink.h>
 #include <net/sch_generic.h>
@@ -852,6 +853,7 @@ static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
 static int dsa_switch_setup(struct dsa_switch *ds)
 {
 	struct dsa_devlink_priv *dl_priv;
+	struct device_node *dn;
 	struct dsa_port *dp;
 	int err;
 
@@ -907,7 +909,10 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 
 		dsa_slave_mii_bus_init(ds);
 
-		err = mdiobus_register(ds->slave_mii_bus);
+		dn = of_get_child_by_name(ds->dev->of_node, "mdio");
+
+		err = of_mdiobus_register(ds->slave_mii_bus, dn);
+		of_node_put(dn);
 		if (err < 0)
 			goto free_slave_mii_bus;
 	}
-- 
2.36.0

Re: [PATCH net-next RESEND] net: dsa: OF-ware slave_mii_bus

[Luiz Angelo Daros de Luca]

In the last attempt, this patch was part of a doc+net series. However,
Rob Herring NAKed the binding patch as we cannot define a "mdio" node
in dsa.yaml without breaking anyone who references dsa.yaml to need to
redefine/specialize that same node.

https://lore.kernel.org/lkml/Yhfmi2Mn6e0NMXh3@robh.at.kernel.org/

So, the generic slave "mdio" node must be declared on each device that
might use it in the future.

Regards,

Luiz

Re: [PATCH net-next RESEND] net: dsa: OF-ware slave_mii_bus

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sun, 22 May 2022 22:32:34 -0300 you wrote:
> If found, register the DSA internally allocated slave_mii_bus with an OF
> "mdio" child object. It can save some drivers from creating their
> custom internal MDIO bus.
> 
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> 
> [...]

Here is the summary with links:
  - [net-next,RESEND] net: dsa: OF-ware slave_mii_bus
    https://git.kernel.org/netdev/net-next/c/fe7324b93222

You are awesome, thank you!
-- 
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