[PATCHv2 (net.git) 0/2] stmmac: MDIO fixes

[PATCHv2 (net.git) 0/2] stmmac: MDIO fixes

[Giuseppe Cavallaro]

These two patches are to fix the recent regressions raised
when test the stmmac on some platforms due to broken MDIO
management.

V2: use is_pseudo_fixed_link

Giuseppe Cavallaro (2):
  Revert "stmmac: Fix 'eth0: No PHY found' regression"
  stmmac: fix MDIO settings

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   11 ++-------
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  |   11 +++++++++-
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   21 ++++---------------
 include/linux/stmmac.h                             |    2 -
 4 files changed, 18 insertions(+), 27 deletions(-)

-- 
1.7.4.4

[PATCHv2 (net.git) 1/2] Revert "stmmac: Fix 'eth0: No PHY found' regression"

[Giuseppe Cavallaro]

This reverts commit 88f8b1bb41c6208f81b6a480244533ded7b59493.
due to problems on GeekBox and Banana Pi M1 board when
connected to a real transceiver instead of a switch via
fixed-link.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  |   11 ++++++++++-
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |    9 +--------
 include/linux/stmmac.h                             |    1 -
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index efb54f3..0faf163 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -199,12 +199,21 @@ int stmmac_mdio_register(struct net_device *ndev)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	int addr, found;
-	struct device_node *mdio_node = priv->plat->mdio_node;
+	struct device_node *mdio_node = NULL;
+	struct device_node *child_node = NULL;
 
 	if (!mdio_bus_data)
 		return 0;
 
 	if (IS_ENABLED(CONFIG_OF)) {
+		for_each_child_of_node(priv->device->of_node, child_node) {
+			if (of_device_is_compatible(child_node,
+						    "snps,dwmac-mdio")) {
+				mdio_node = child_node;
+				break;
+			}
+		}
+
 		if (mdio_node) {
 			netdev_dbg(ndev, "FOUND MDIO subnode\n");
 		} else {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 4514ba7..6a52fa1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -110,7 +110,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	struct device_node *np = pdev->dev.of_node;
 	struct plat_stmmacenet_data *plat;
 	struct stmmac_dma_cfg *dma_cfg;
-	struct device_node *child_node = NULL;
 
 	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
 	if (!plat)
@@ -141,19 +140,13 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 		plat->phy_node = of_node_get(np);
 	}
 
-	for_each_child_of_node(np, child_node)
-		if (of_device_is_compatible(child_node,	"snps,dwmac-mdio")) {
-			plat->mdio_node = child_node;
-			break;
-		}
-
 	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
 	 * and warn of its use. Remove this when phy node support is added.
 	 */
 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || !plat->mdio_node)
+	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
 		plat->mdio_bus_data = NULL;
 	else
 		plat->mdio_bus_data =
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 881a79d..eead8ab 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -100,7 +100,6 @@ struct plat_stmmacenet_data {
 	int interface;
 	struct stmmac_mdio_bus_data *mdio_bus_data;
 	struct device_node *phy_node;
-	struct device_node *mdio_node;
 	struct stmmac_dma_cfg *dma_cfg;
 	int clk_csr;
 	int has_gmac;
-- 
1.7.4.4

[PATCHv2 (net.git) 2/2] stmmac: fix MDIO settings

[Giuseppe Cavallaro]

Initially the phy_bus_name was added to manipulate the
driver name but It was recently just used to manage the
fixed-link and then to take some decision at run-time
inside the main (for example to skip EEE).
So the patch uses the is_pseudo_fixed_link and removes
removes the phy_bus_name variable not necessary anymore.

The driver can manage the mdio registration by using phy-handle,
dwmac-mdio and own parameter e.g. snps,phy-addr.
This patch takes care about all these possible configurations
and fixes the mdio registration in case of there is a real
transceiver or a switch (that needs to be managed by using
fixed-link).

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
---

V2: use is_pseudo_fixed_link

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   11 +++--------
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   14 +++++---------
 include/linux/stmmac.h                             |    1 -
 3 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c21015b..389d7d0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -271,7 +271,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
  */
 bool stmmac_eee_init(struct stmmac_priv *priv)
 {
-	char *phy_bus_name = priv->plat->phy_bus_name;
 	unsigned long flags;
 	bool ret = false;
 
@@ -283,7 +282,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
 		goto out;
 
 	/* Never init EEE in case of a switch is attached */
-	if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
+	if (priv->phydev->is_pseudo_fixed_link)
 		goto out;
 
 	/* MAC core supports the EEE feature. */
@@ -820,12 +819,8 @@ static int stmmac_init_phy(struct net_device *dev)
 		phydev = of_phy_connect(dev, priv->plat->phy_node,
 					&stmmac_adjust_link, 0, interface);
 	} else {
-		if (priv->plat->phy_bus_name)
-			snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
-				 priv->plat->phy_bus_name, priv->plat->bus_id);
-		else
-			snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
-				 priv->plat->bus_id);
+		snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
+			 priv->plat->bus_id);
 
 		snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 			 priv->plat->phy_addr);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 6a52fa1..ed33920 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -138,7 +138,11 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 			return ERR_PTR(-ENODEV);
 
 		plat->phy_node = of_node_get(np);
-	}
+	} else
+		plat->mdio_bus_data =
+			devm_kzalloc(&pdev->dev,
+				     sizeof(struct stmmac_mdio_bus_data),
+				     GFP_KERNEL);
 
 	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
 	 * and warn of its use. Remove this when phy node support is added.
@@ -146,14 +150,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
-		plat->mdio_bus_data = NULL;
-	else
-		plat->mdio_bus_data =
-			devm_kzalloc(&pdev->dev,
-				     sizeof(struct stmmac_mdio_bus_data),
-				     GFP_KERNEL);
-
 	of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
 
 	of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index eead8ab..1b4884c 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -94,7 +94,6 @@ struct stmmac_dma_cfg {
 };
 
 struct plat_stmmacenet_data {
-	char *phy_bus_name;
 	int bus_id;
 	int phy_addr;
 	int interface;
-- 
1.7.4.4

Re: [PATCHv2 (net.git) 2/2] stmmac: fix MDIO settings

[Phil Reid]

G'day Giuseppe,

Sorry for delay in responding.
I feel responsible for starting the changes breaking this.

See below.

On 11/03/2016 3:44 PM, Giuseppe Cavallaro wrote:
> Initially the phy_bus_name was added to manipulate the
> driver name but It was recently just used to manage the
> fixed-link and then to take some decision at run-time
> inside the main (for example to skip EEE).
> So the patch uses the is_pseudo_fixed_link and removes
> removes the phy_bus_name variable not necessary anymore.
>
> The driver can manage the mdio registration by using phy-handle,
> dwmac-mdio and own parameter e.g. snps,phy-addr.
> This patch takes care about all these possible configurations
> and fixes the mdio registration in case of there is a real
> transceiver or a switch (that needs to be managed by using
> fixed-link).
>
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Reviewed-by: Andreas Färber <afaerber@suse.de>
> Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
> Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
> Cc: Dinh Nguyen <dinh.linux@gmail.com>
> Cc: David S. Miller <davem@davemloft.net>
> ---
>
> V2: use is_pseudo_fixed_link
>
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   11 +++--------
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   14 +++++---------
>   include/linux/stmmac.h                             |    1 -
>   3 files changed, 8 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index c21015b..389d7d0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -271,7 +271,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
>    */
>   bool stmmac_eee_init(struct stmmac_priv *priv)
>   {
> -	char *phy_bus_name = priv->plat->phy_bus_name;
>   	unsigned long flags;
>   	bool ret = false;
>
> @@ -283,7 +282,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
>   		goto out;
>
>   	/* Never init EEE in case of a switch is attached */
> -	if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
> +	if (priv->phydev->is_pseudo_fixed_link)
>   		goto out;
>
>   	/* MAC core supports the EEE feature. */
> @@ -820,12 +819,8 @@ static int stmmac_init_phy(struct net_device *dev)
>   		phydev = of_phy_connect(dev, priv->plat->phy_node,
>   					&stmmac_adjust_link, 0, interface);
>   	} else {
> -		if (priv->plat->phy_bus_name)
> -			snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
> -				 priv->plat->phy_bus_name, priv->plat->bus_id);
> -		else
> -			snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
> -				 priv->plat->bus_id);
> +		snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
> +			 priv->plat->bus_id);
>
>   		snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
>   			 priv->plat->phy_addr);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 6a52fa1..ed33920 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -138,7 +138,11 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>   			return ERR_PTR(-ENODEV);
>
>   		plat->phy_node = of_node_get(np);
> -	}
> +	} else
> +		plat->mdio_bus_data =
> +			devm_kzalloc(&pdev->dev,
> +				     sizeof(struct stmmac_mdio_bus_data),
> +				     GFP_KERNEL);

This breaks my use case where I have a fixed link but also need the mdio bus for
talking to a dsa switch. stmmac_mdio_register bails out because mdio_bus_data is
never allocated here at this point when a fixed link exists with no phy-handle
property. Removing the else solves my use.

Possibly it could be allocated in stmmac_mdio_register if snps,dwmac-mdio
is found and not already allocated.
With the
	if (!mdio_bus_data)
		return 0;
to after the device tree query.



>
>   	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
>   	 * and warn of its use. Remove this when phy node support is added.
> @@ -146,14 +150,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>   	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
>   		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
>
> -	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
> -		plat->mdio_bus_data = NULL;
> -	else
> -		plat->mdio_bus_data =
> -			devm_kzalloc(&pdev->dev,
> -				     sizeof(struct stmmac_mdio_bus_data),
> -				     GFP_KERNEL);
> -
>   	of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
>
>   	of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index eead8ab..1b4884c 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -94,7 +94,6 @@ struct stmmac_dma_cfg {
>   };
>
>   struct plat_stmmacenet_data {
> -	char *phy_bus_name;
>   	int bus_id;
>   	int phy_addr;
>   	int interface;
>


-- 
Regards
Phil Reid

Re: [PATCHv2 (net.git) 2/2] stmmac: fix MDIO settings

[Giuseppe CAVALLARO]

On 3/11/2016 9:16 AM, Phil Reid wrote:
> G'day Giuseppe,
>
> Sorry for delay in responding.
> I feel responsible for starting the changes breaking this.
>
> See below.
>
> On 11/03/2016 3:44 PM, Giuseppe Cavallaro wrote:
>> Initially the phy_bus_name was added to manipulate the
>> driver name but It was recently just used to manage the
>> fixed-link and then to take some decision at run-time
>> inside the main (for example to skip EEE).
>> So the patch uses the is_pseudo_fixed_link and removes
>> removes the phy_bus_name variable not necessary anymore.
>>
>> The driver can manage the mdio registration by using phy-handle,
>> dwmac-mdio and own parameter e.g. snps,phy-addr.
>> This patch takes care about all these possible configurations
>> and fixes the mdio registration in case of there is a real
>> transceiver or a switch (that needs to be managed by using
>> fixed-link).
>>
>> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>> Reviewed-by: Andreas Färber <afaerber@suse.de>
>> Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
>> Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
>> Cc: Dinh Nguyen <dinh.linux@gmail.com>
>> Cc: David S. Miller <davem@davemloft.net>
>> ---
>>
>> V2: use is_pseudo_fixed_link
>>
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   11 +++--------
>>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   14
>> +++++---------
>>   include/linux/stmmac.h                             |    1 -
>>   3 files changed, 8 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index c21015b..389d7d0 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -271,7 +271,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
>>    */
>>   bool stmmac_eee_init(struct stmmac_priv *priv)
>>   {
>> -    char *phy_bus_name = priv->plat->phy_bus_name;
>>       unsigned long flags;
>>       bool ret = false;
>>
>> @@ -283,7 +282,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
>>           goto out;
>>
>>       /* Never init EEE in case of a switch is attached */
>> -    if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
>> +    if (priv->phydev->is_pseudo_fixed_link)
>>           goto out;
>>
>>       /* MAC core supports the EEE feature. */
>> @@ -820,12 +819,8 @@ static int stmmac_init_phy(struct net_device *dev)
>>           phydev = of_phy_connect(dev, priv->plat->phy_node,
>>                       &stmmac_adjust_link, 0, interface);
>>       } else {
>> -        if (priv->plat->phy_bus_name)
>> -            snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
>> -                 priv->plat->phy_bus_name, priv->plat->bus_id);
>> -        else
>> -            snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
>> -                 priv->plat->bus_id);
>> +        snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
>> +             priv->plat->bus_id);
>>
>>           snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
>>                priv->plat->phy_addr);
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 6a52fa1..ed33920 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -138,7 +138,11 @@ stmmac_probe_config_dt(struct platform_device
>> *pdev, const char **mac)
>>               return ERR_PTR(-ENODEV);
>>
>>           plat->phy_node = of_node_get(np);
>> -    }
>> +    } else
>> +        plat->mdio_bus_data =
>> +            devm_kzalloc(&pdev->dev,
>> +                     sizeof(struct stmmac_mdio_bus_data),
>> +                     GFP_KERNEL);
>
> This breaks my use case where I have a fixed link but also need the mdio
> bus for
> talking to a dsa switch. stmmac_mdio_register bails out because
> mdio_bus_data is
> never allocated here at this point when a fixed link exists with no
> phy-handle
> property. Removing the else solves my use.

ok I get the point.

>
> Possibly it could be allocated in stmmac_mdio_register if snps,dwmac-mdio
> is found and not already allocated.
> With the
>      if (!mdio_bus_data)
>          return 0;
> to after the device tree query.

this is a way. Let me do some tests and I send the V3.

Thx for your feedback

peppe

>
>
>>
>>       /* "snps,phy-addr" is not a standard property. Mark it as
>> deprecated
>>        * and warn of its use. Remove this when phy node support is added.
>> @@ -146,14 +150,6 @@ stmmac_probe_config_dt(struct platform_device
>> *pdev, const char **mac)
>>       if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr)
>> == 0)
>>           dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
>>
>> -    if ((plat->phy_node && !of_phy_is_fixed_link(np)) ||
>> plat->phy_bus_name)
>> -        plat->mdio_bus_data = NULL;
>> -    else
>> -        plat->mdio_bus_data =
>> -            devm_kzalloc(&pdev->dev,
>> -                     sizeof(struct stmmac_mdio_bus_data),
>> -                     GFP_KERNEL);
>> -
>>       of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
>>
>>       of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>> index eead8ab..1b4884c 100644
>> --- a/include/linux/stmmac.h
>> +++ b/include/linux/stmmac.h
>> @@ -94,7 +94,6 @@ struct stmmac_dma_cfg {
>>   };
>>
>>   struct plat_stmmacenet_data {
>> -    char *phy_bus_name;
>>       int bus_id;
>>       int phy_addr;
>>       int interface;
>>
>
>

Re: [PATCHv2 (net.git) 2/2] stmmac: fix MDIO settings

[Giuseppe CAVALLARO]

Hello Phil

On 3/11/2016 9:16 AM, Phil Reid wrote:
> G'day Giuseppe,
>
> Sorry for delay in responding.
> I feel responsible for starting the changes breaking this.


no pbl at all. I have just sent the V3 where I try to cover
all the cases, pls let me know if you see some problem.
I successfully tested it on my side with H410 SoC + fixed-link
(switch on board)

Regards
Peppe

>
> See below.
>
> On 11/03/2016 3:44 PM, Giuseppe Cavallaro wrote:
>> Initially the phy_bus_name was added to manipulate the
>> driver name but It was recently just used to manage the
>> fixed-link and then to take some decision at run-time
>> inside the main (for example to skip EEE).
>> So the patch uses the is_pseudo_fixed_link and removes
>> removes the phy_bus_name variable not necessary anymore.
>>
>> The driver can manage the mdio registration by using phy-handle,
>> dwmac-mdio and own parameter e.g. snps,phy-addr.
>> This patch takes care about all these possible configurations
>> and fixes the mdio registration in case of there is a real
>> transceiver or a switch (that needs to be managed by using
>> fixed-link).
>>
>> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>> Reviewed-by: Andreas Färber <afaerber@suse.de>
>> Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
>> Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
>> Cc: Dinh Nguyen <dinh.linux@gmail.com>
>> Cc: David S. Miller <davem@davemloft.net>
>> ---
>>
>> V2: use is_pseudo_fixed_link
>>
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   11 +++--------
>>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   14
>> +++++---------
>>   include/linux/stmmac.h                             |    1 -
>>   3 files changed, 8 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index c21015b..389d7d0 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -271,7 +271,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
>>    */
>>   bool stmmac_eee_init(struct stmmac_priv *priv)
>>   {
>> -    char *phy_bus_name = priv->plat->phy_bus_name;
>>       unsigned long flags;
>>       bool ret = false;
>>
>> @@ -283,7 +282,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
>>           goto out;
>>
>>       /* Never init EEE in case of a switch is attached */
>> -    if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
>> +    if (priv->phydev->is_pseudo_fixed_link)
>>           goto out;
>>
>>       /* MAC core supports the EEE feature. */
>> @@ -820,12 +819,8 @@ static int stmmac_init_phy(struct net_device *dev)
>>           phydev = of_phy_connect(dev, priv->plat->phy_node,
>>                       &stmmac_adjust_link, 0, interface);
>>       } else {
>> -        if (priv->plat->phy_bus_name)
>> -            snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
>> -                 priv->plat->phy_bus_name, priv->plat->bus_id);
>> -        else
>> -            snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
>> -                 priv->plat->bus_id);
>> +        snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
>> +             priv->plat->bus_id);
>>
>>           snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
>>                priv->plat->phy_addr);
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 6a52fa1..ed33920 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -138,7 +138,11 @@ stmmac_probe_config_dt(struct platform_device
>> *pdev, const char **mac)
>>               return ERR_PTR(-ENODEV);
>>
>>           plat->phy_node = of_node_get(np);
>> -    }
>> +    } else
>> +        plat->mdio_bus_data =
>> +            devm_kzalloc(&pdev->dev,
>> +                     sizeof(struct stmmac_mdio_bus_data),
>> +                     GFP_KERNEL);
>
> This breaks my use case where I have a fixed link but also need the mdio
> bus for
> talking to a dsa switch. stmmac_mdio_register bails out because
> mdio_bus_data is
> never allocated here at this point when a fixed link exists with no
> phy-handle
> property. Removing the else solves my use.
>
> Possibly it could be allocated in stmmac_mdio_register if snps,dwmac-mdio
> is found and not already allocated.
> With the
>      if (!mdio_bus_data)
>          return 0;
> to after the device tree query.
>
>
>
>>
>>       /* "snps,phy-addr" is not a standard property. Mark it as
>> deprecated
>>        * and warn of its use. Remove this when phy node support is added.
>> @@ -146,14 +150,6 @@ stmmac_probe_config_dt(struct platform_device
>> *pdev, const char **mac)
>>       if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr)
>> == 0)
>>           dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
>>
>> -    if ((plat->phy_node && !of_phy_is_fixed_link(np)) ||
>> plat->phy_bus_name)
>> -        plat->mdio_bus_data = NULL;
>> -    else
>> -        plat->mdio_bus_data =
>> -            devm_kzalloc(&pdev->dev,
>> -                     sizeof(struct stmmac_mdio_bus_data),
>> -                     GFP_KERNEL);
>> -
>>       of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
>>
>>       of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>> index eead8ab..1b4884c 100644
>> --- a/include/linux/stmmac.h
>> +++ b/include/linux/stmmac.h
>> @@ -94,7 +94,6 @@ struct stmmac_dma_cfg {
>>   };
>>
>>   struct plat_stmmacenet_data {
>> -    char *phy_bus_name;
>>       int bus_id;
>>       int phy_addr;
>>       int interface;
>>
>
>