[PATCH master] net: designware: eqos: fix MDIO regression for STM32MP1 boards

[Ahmad Fatoum]

Hello Sascha,

On 04.10.21 13:26, Sascha Hauer wrote:
> On Tue, Aug 31, 2021 at 05:32:14PM +0200, Ahmad Fatoum wrote:
>> The STM32MP1 boards call their mdio subnode mdio0, which is now skipped
>> since ed8c7bdf8592 ("net: designware: eqos: set mdio bus device node").
>>
>> Fix networking for them by only falling back to the mdio node name when a
>> child node with the correct compatible could not be found.
>>
>> Fixes: ed8c7bdf8592 ("net: designware: eqos: set mdio bus device node")
>> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
>> ---
>>  drivers/net/designware_eqos.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/designware_eqos.c b/drivers/net/designware_eqos.c
>> index f83ec127143c..5eee844e289a 100644
>> --- a/drivers/net/designware_eqos.c
>> +++ b/drivers/net/designware_eqos.c
>> @@ -824,6 +824,7 @@ static void eqos_probe_dt(struct device_d *dev, struct eqos *eqos)
>>  
>>  int eqos_probe(struct device_d *dev, const struct eqos_ops *ops, void *priv)
>>  {
>> +	struct device_node *np = dev->device_node;
>>  	struct mii_bus *miibus;
>>  	struct resource *iores;
>>  	struct eqos *eqos;
>> @@ -862,7 +863,10 @@ int eqos_probe(struct device_d *dev, const struct eqos_ops *ops, void *priv)
>>  	miibus->read = eqos_mdio_read;
>>  	miibus->write = eqos_mdio_write;
>>  	miibus->priv = eqos;
>> -	miibus->dev.device_node = of_get_child_by_name(dev->device_node, "mdio");
>> +
>> +	miibus->dev.device_node = of_get_compatible_child(np, "snps,dwmac-mdio");
>> +	if (!miibus->dev.device_node)
>> +		miibus->dev.device_node = of_get_child_by_name(np, "mdio");
> 
> Do we need this fallback? I think I introduced ed8c7bdf8592 for the
> rk3568, which also should work without the fallback.

Linux driver uses "mdio" node name for snps,dwc-qos-ethernet-4.10 and looks
at compatible otherwise. That's why I chose to keep support for both.

> 
> Sascha
> 


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