[v5,1/4] stmmac: create of compatible mdio bus for stmacc driver

The DSA driver needs to be passed a reference to an mdio bus. Typically
the mac is configured to use a fixed link but the mdio bus still needs
to be registered so that it con configure the switch.
This patch follows the same process as the altera tse ethernet driver for
creation of the mdio bus.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Phil Reid <preid@electromag.com.au>
---
 Documentation/devicetree/bindings/net/stmmac.txt   |  8 ++++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 31 +++++++++++++++-------
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  2 +-
 3 files changed, 31 insertions(+), 10 deletions(-)

Hi

also pls fix this typo

stmmac: create of compatible mdio bus for stmacc driver
                                          ^^^^^^^^
                                           stmmac

On 12/9/2015 9:39 AM, Phil Reid wrote:
> The DSA driver needs to be passed a reference to an mdio bus. Typically
> the mac is configured to use a fixed link but the mdio bus still needs
> to be registered so that it con configure the switch.
> This patch follows the same process as the altera tse ethernet driver for
> creation of the mdio bus.
>
> Acked-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Phil Reid <preid@electromag.com.au>
> ---
>   Documentation/devicetree/bindings/net/stmmac.txt   |  8 ++++++
>   drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 31 +++++++++++++++-------
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  2 +-
>   3 files changed, 31 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index f34fc3c..fd5ddf8 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -47,6 +47,7 @@ Optional properties:
>   - snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
>   - tx-fifo-depth: See ethernet.txt file in the same directory
>   - rx-fifo-depth: See ethernet.txt file in the same directory
> +- mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
>
>   Examples:
>
> @@ -65,4 +66,11 @@ Examples:
>   		tx-fifo-depth = <16384>;
>   		clocks = <&clock>;
>   		clock-names = "stmmaceth";
> +		mdio0 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			compatible = "snps,dwmac-mdio";
> +			phy1: ethernet-phy@0 {
> +			};
> +		};
>   	};
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index bba670c..bb6f75c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -29,7 +29,7 @@
>   #include <linux/slab.h>
>   #include <linux/of.h>
>   #include <linux/of_gpio.h>
> -
> +#include <linux/of_mdio.h>
>   #include <asm/io.h>
>
>   #include "stmmac.h"
> @@ -200,10 +200,29 @@ 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 = 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 {
> +			netdev_err(ndev, "NO MDIO subnode\n");
> +			return 0;
> +		}
> +	}
> +
>   	new_bus = mdiobus_alloc();
>   	if (new_bus == NULL)
>   		return -ENOMEM;
> @@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
>   	new_bus->irq = irqlist;
>   	new_bus->phy_mask = mdio_bus_data->phy_mask;
>   	new_bus->parent = priv->device;
> -	err = mdiobus_register(new_bus);
> +
> +	err = of_mdiobus_register(new_bus, mdio_node);
>   	if (err != 0) {
>   		pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
>   		goto bus_register_fail;
> @@ -284,13 +304,6 @@ int stmmac_mdio_register(struct net_device *ndev)
>   		}
>   	}
>
> -	if (!found) {
> -		pr_warn("%s: No PHY found\n", ndev->name);
> -		mdiobus_unregister(new_bus);
> -		mdiobus_free(new_bus);
> -		return -ENODEV;
> -	}

hmm,  this could be necessary on some platforms that wants to
get the phy addr at runtime and in case of failure then
removes the registered bus.

> -
>   	priv->mii = new_bus;
>
>   	return 0;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index d02691b..6863420 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -146,7 +146,7 @@ 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 || plat->phy_bus_name)

can this breaks some conf case?

> +	if (plat->phy_bus_name)
>   		plat->mdio_bus_data = NULL;
>   	else
>   		plat->mdio_bus_data =
>

peppe
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G'day Giuseppe,

On 11/12/2015 1:16 AM, Giuseppe CAVALLARO wrote:
> Hi
>
> also pls fix this typo
>
> stmmac: create of compatible mdio bus for stmacc driver
>                                           ^^^^^^^^
>                                            stmmac
Will do.
>
> On 12/9/2015 9:39 AM, Phil Reid wrote:
>> The DSA driver needs to be passed a reference to an mdio bus. Typically
>> the mac is configured to use a fixed link but the mdio bus still needs
>> to be registered so that it con configure the switch.
>> This patch follows the same process as the altera tse ethernet driver for
>> creation of the mdio bus.
>>
>> Acked-by: Rob Herring <robh@kernel.org>
>> Signed-off-by: Phil Reid <preid@electromag.com.au>
>> ---
>>   Documentation/devicetree/bindings/net/stmmac.txt   |  8 ++++++
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 31 +++++++++++++++-------
>>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  2 +-
>>   3 files changed, 31 insertions(+), 10 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
>> index f34fc3c..fd5ddf8 100644
>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>> @@ -47,6 +47,7 @@ Optional properties:
>>   - snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
>>   - tx-fifo-depth: See ethernet.txt file in the same directory
>>   - rx-fifo-depth: See ethernet.txt file in the same directory
>> +- mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
>>
>>   Examples:
>>
>> @@ -65,4 +66,11 @@ Examples:
>>           tx-fifo-depth = <16384>;
>>           clocks = <&clock>;
>>           clock-names = "stmmaceth";
>> +        mdio0 {
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +            compatible = "snps,dwmac-mdio";
>> +            phy1: ethernet-phy@0 {
>> +            };
>> +        };
>>       };
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> index bba670c..bb6f75c 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> @@ -29,7 +29,7 @@
>>   #include <linux/slab.h>
>>   #include <linux/of.h>
>>   #include <linux/of_gpio.h>
>> -
>> +#include <linux/of_mdio.h>
>>   #include <asm/io.h>
>>
>>   #include "stmmac.h"
>> @@ -200,10 +200,29 @@ 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 = 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 {
>> +            netdev_err(ndev, "NO MDIO subnode\n");
>> +            return 0;
>> +        }
>> +    }
>> +
>>       new_bus = mdiobus_alloc();
>>       if (new_bus == NULL)
>>           return -ENOMEM;
>> @@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
>>       new_bus->irq = irqlist;
>>       new_bus->phy_mask = mdio_bus_data->phy_mask;
>>       new_bus->parent = priv->device;
>> -    err = mdiobus_register(new_bus);
>> +
>> +    err = of_mdiobus_register(new_bus, mdio_node);
>>       if (err != 0) {
>>           pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
>>           goto bus_register_fail;
>> @@ -284,13 +304,6 @@ int stmmac_mdio_register(struct net_device *ndev)
>>           }
>>       }
>>
>> -    if (!found) {
>> -        pr_warn("%s: No PHY found\n", ndev->name);
>> -        mdiobus_unregister(new_bus);
>> -        mdiobus_free(new_bus);
>> -        return -ENODEV;
>> -    }
>
> hmm,  this could be necessary on some platforms that wants to
> get the phy addr at runtime and in case of failure then
> removes the registered bus.
>
Could make this conditional on (!found && !mdio_node).
Therefore if dt node exists it will be created regardless, otherwise unregister if nothing found.
Thoughts?

>> -
>>       priv->mii = new_bus;
>>
>>       return 0;
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index d02691b..6863420 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -146,7 +146,7 @@ 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");
>>ec
>> -    if (plat->phy_node || plat->phy_bus_name)
>
I think that would be dependent on the device tree.
However this may also work:
if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)

> can this breaks some conf case?
>
>> +    if (plat->phy_bus_name)
>>           plat->mdio_bus_data = NULL;
>>       else
>>           plat->mdio_bus_data =
>>

Alternatively the solution would be to introduce some non standard device tree node
to force the creation of the mdio bus.

Hello Phil

On 12/11/2015 2:44 AM, Phil Reid wrote:
> G'day Giuseppe,
>
> On 11/12/2015 1:16 AM, Giuseppe CAVALLARO wrote:
>> Hi
>>
>> also pls fix this typo
>>
>> stmmac: create of compatible mdio bus for stmacc driver
>>                                           ^^^^^^^^
>>                                            stmmac
> Will do.
>>
>> On 12/9/2015 9:39 AM, Phil Reid wrote:
>>> The DSA driver needs to be passed a reference to an mdio bus. Typically
>>> the mac is configured to use a fixed link but the mdio bus still needs
>>> to be registered so that it con configure the switch.
>>> This patch follows the same process as the altera tse ethernet driver
>>> for
>>> creation of the mdio bus.
>>>
>>> Acked-by: Rob Herring <robh@kernel.org>
>>> Signed-off-by: Phil Reid <preid@electromag.com.au>
>>> ---
>>>   Documentation/devicetree/bindings/net/stmmac.txt   |  8 ++++++
>>>   drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 31
>>> +++++++++++++++-------
>>>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  2 +-
>>>   3 files changed, 31 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt
>>> b/Documentation/devicetree/bindings/net/stmmac.txt
>>> index f34fc3c..fd5ddf8 100644
>>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>>> @@ -47,6 +47,7 @@ Optional properties:
>>>   - snps,burst_len: The AXI burst lenth value of the AXI BUS MODE
>>> register.
>>>   - tx-fifo-depth: See ethernet.txt file in the same directory
>>>   - rx-fifo-depth: See ethernet.txt file in the same directory
>>> +- mdio: with compatible = "snps,dwmac-mdio", create and register
>>> mdio bus.
>>>
>>>   Examples:
>>>
>>> @@ -65,4 +66,11 @@ Examples:
>>>           tx-fifo-depth = <16384>;
>>>           clocks = <&clock>;
>>>           clock-names = "stmmaceth";
>>> +        mdio0 {
>>> +            #address-cells = <1>;
>>> +            #size-cells = <0>;
>>> +            compatible = "snps,dwmac-mdio";
>>> +            phy1: ethernet-phy@0 {
>>> +            };
>>> +        };
>>>       };
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> index bba670c..bb6f75c 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> @@ -29,7 +29,7 @@
>>>   #include <linux/slab.h>
>>>   #include <linux/of.h>
>>>   #include <linux/of_gpio.h>
>>> -
>>> +#include <linux/of_mdio.h>
>>>   #include <asm/io.h>
>>>
>>>   #include "stmmac.h"
>>> @@ -200,10 +200,29 @@ 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 = 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 {
>>> +            netdev_err(ndev, "NO MDIO subnode\n");
>>> +            return 0;
>>> +        }
>>> +    }
>>> +
>>>       new_bus = mdiobus_alloc();
>>>       if (new_bus == NULL)
>>>           return -ENOMEM;
>>> @@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
>>>       new_bus->irq = irqlist;
>>>       new_bus->phy_mask = mdio_bus_data->phy_mask;
>>>       new_bus->parent = priv->device;
>>> -    err = mdiobus_register(new_bus);
>>> +
>>> +    err = of_mdiobus_register(new_bus, mdio_node);
>>>       if (err != 0) {
>>>           pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
>>>           goto bus_register_fail;
>>> @@ -284,13 +304,6 @@ int stmmac_mdio_register(struct net_device *ndev)
>>>           }
>>>       }
>>>
>>> -    if (!found) {
>>> -        pr_warn("%s: No PHY found\n", ndev->name);
>>> -        mdiobus_unregister(new_bus);
>>> -        mdiobus_free(new_bus);
>>> -        return -ENODEV;
>>> -    }
>>
>> hmm,  this could be necessary on some platforms that wants to
>> get the phy addr at runtime and in case of failure then
>> removes the registered bus.
>>
> Could make this conditional on (!found && !mdio_node).
> Therefore if dt node exists it will be created regardless, otherwise
> unregister if nothing found.
> Thoughts?
>
>>> -
>>>       priv->mii = new_bus;
>>>
>>>       return 0;
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> index d02691b..6863420 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> @@ -146,7 +146,7 @@ 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");
>>> ec
>>> -    if (plat->phy_node || plat->phy_bus_name)
>>
> I think that would be dependent on the device tree.
> However this may also work:
> if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)

that's ok for me

>
>> can this breaks some conf case?
>>
>>> +    if (plat->phy_bus_name)
>>>           plat->mdio_bus_data = NULL;
>>>       else
>>>           plat->mdio_bus_data =
>>>
>
> Alternatively the solution would be to introduce some non standard
> device tree node
> to force the creation of the mdio bus.

no, I guess the easier way is what you proposed.

Peppe

>
>

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