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Date: Wed, 01 Oct 2014 17:33:20 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Petri Gynther <pgynther@...gle.com>
CC: netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
thomas.petazzoni@...e-electrons.com
Subject: Re: [PATCH net-next] net: phy: adjust fixed_phy_register() return
value
On 10/01/2014 03:16 PM, Petri Gynther wrote:
> Hi Florian,
>
> On Wed, Oct 1, 2014 at 2:56 PM, Florian Fainelli <f.fainelli@...il.com> wrote:
>> On 10/01/2014 02:45 PM, Petri Gynther wrote:
>>> Adjust fixed_phy_register() to return struct phy_device *, so that
>>> it becomes easy to use fixed PHYs without device tree support:
>>>
>>> phydev = fixed_phy_register(PHY_POLL, &fixed_phy_status, NULL);
>>> fixed_phy_set_link_update(phydev, fixed_phy_link_update);
>>> phy_connect_direct(netdev, phydev, handler_fn, phy_interface);
>>>
>>> This change is a prerequisite for modifying bcmgenet driver to work
>>> without a device tree on Broadcom's MIPS-based 7xxx platforms.
>>
>> Without a Device Tree enabled platform, you still have the
>> fixed_phy_add() API to register a fixed PHY at a known location (the
>> second parameter), did we someone broke that with Thomas' patches?
>>
>
> If a driver uses fixed_phy_add() directly, it then has to call
> get_phy_device() and phy_device_register() as well. But, all that is
> already handled nicely inside fixed_phy_register(). And,
> fixed_phy_register() also handles the fixed PHY address allocation
> automatically.
Sure, the usual model we had before Thomas' patches was to specifically
format phy_id to make sure we would bind to the "fixed-0" MDIO bus
instead of another one, see drivers/net/ethernet/ti/cpmac.c for instance.
>
> In my opinion, this change makes it really easy to use fixed PHYs from
> non-OF code, as I showed in the change description.
Agreed, and I think it will allow us to get rid of the manual allocation
API eventually.
I let Thomas comment on whether he likes this or not.
>
> -- Petri
>
>> You could for instance register a fixed PHY at address 1 for the
>> GENET/MoCA instance to find it.
>>
>> Other than that, I am not opposed to the change, since it allows us to
>> eventually get rid of fixed_phy_add() in the future.
>>
>> Thanks!
>>
>>>
>>> Signed-off-by: Petri Gynther <pgynther@...gle.com>
>>> ---
>>> drivers/net/phy/fixed.c | 16 ++++++++--------
>>> drivers/of/of_mdio.c | 7 +++++--
>>> include/linux/phy_fixed.h | 14 +++++++-------
>>> 3 files changed, 20 insertions(+), 17 deletions(-)
>>>
>>> diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
>>> index 5b19fbb..47872caa 100644
>>> --- a/drivers/net/phy/fixed.c
>>> +++ b/drivers/net/phy/fixed.c
>>> @@ -233,9 +233,9 @@ EXPORT_SYMBOL_GPL(fixed_phy_del);
>>> static int phy_fixed_addr;
>>> static DEFINE_SPINLOCK(phy_fixed_addr_lock);
>>>
>>> -int fixed_phy_register(unsigned int irq,
>>> - struct fixed_phy_status *status,
>>> - struct device_node *np)
>>> +struct phy_device *fixed_phy_register(unsigned int irq,
>>> + struct fixed_phy_status *status,
>>> + struct device_node *np)
>>> {
>>> struct fixed_mdio_bus *fmb = &platform_fmb;
>>> struct phy_device *phy;
>>> @@ -246,19 +246,19 @@ int fixed_phy_register(unsigned int irq,
>>> spin_lock(&phy_fixed_addr_lock);
>>> if (phy_fixed_addr == PHY_MAX_ADDR) {
>>> spin_unlock(&phy_fixed_addr_lock);
>>> - return -ENOSPC;
>>> + return ERR_PTR(-ENOSPC);
>>> }
>>> phy_addr = phy_fixed_addr++;
>>> spin_unlock(&phy_fixed_addr_lock);
>>>
>>> ret = fixed_phy_add(PHY_POLL, phy_addr, status);
>>> if (ret < 0)
>>> - return ret;
>>> + return ERR_PTR(ret);
>>>
>>> phy = get_phy_device(fmb->mii_bus, phy_addr, false);
>>> if (!phy || IS_ERR(phy)) {
>>> fixed_phy_del(phy_addr);
>>> - return -EINVAL;
>>> + return ERR_PTR(-EINVAL);
>>> }
>>>
>>> of_node_get(np);
>>> @@ -269,10 +269,10 @@ int fixed_phy_register(unsigned int irq,
>>> phy_device_free(phy);
>>> of_node_put(np);
>>> fixed_phy_del(phy_addr);
>>> - return ret;
>>> + return ERR_PTR(ret);
>>> }
>>>
>>> - return 0;
>>> + return phy;
>>> }
>>>
>>> static int __init fixed_mdio_bus_init(void)
>>> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
>>> index a85d800..907baa9 100644
>>> --- a/drivers/of/of_mdio.c
>>> +++ b/drivers/of/of_mdio.c
>>> @@ -286,6 +286,7 @@ int of_phy_register_fixed_link(struct device_node *np)
>>> struct device_node *fixed_link_node;
>>> const __be32 *fixed_link_prop;
>>> int len;
>>> + struct phy_device *phy;
>>>
>>> /* New binding */
>>> fixed_link_node = of_get_child_by_name(np, "fixed-link");
>>> @@ -299,7 +300,8 @@ int of_phy_register_fixed_link(struct device_node *np)
>>> status.asym_pause = of_property_read_bool(fixed_link_node,
>>> "asym-pause");
>>> of_node_put(fixed_link_node);
>>> - return fixed_phy_register(PHY_POLL, &status, np);
>>> + phy = fixed_phy_register(PHY_POLL, &status, np);
>>> + return (!phy || IS_ERR(phy));
>>> }
>>>
>>> /* Old binding */
>>> @@ -310,7 +312,8 @@ int of_phy_register_fixed_link(struct device_node *np)
>>> status.speed = be32_to_cpu(fixed_link_prop[2]);
>>> status.pause = be32_to_cpu(fixed_link_prop[3]);
>>> status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
>>> - return fixed_phy_register(PHY_POLL, &status, np);
>>> + phy = fixed_phy_register(PHY_POLL, &status, np);
>>> + return (!phy || IS_ERR(phy));
>>> }
>>>
>>> return -ENODEV;
>>> diff --git a/include/linux/phy_fixed.h b/include/linux/phy_fixed.h
>>> index 9411386..f2ca1b4 100644
>>> --- a/include/linux/phy_fixed.h
>>> +++ b/include/linux/phy_fixed.h
>>> @@ -14,9 +14,9 @@ struct device_node;
>>> #ifdef CONFIG_FIXED_PHY
>>> extern int fixed_phy_add(unsigned int irq, int phy_id,
>>> struct fixed_phy_status *status);
>>> -extern int fixed_phy_register(unsigned int irq,
>>> - struct fixed_phy_status *status,
>>> - struct device_node *np);
>>> +extern struct phy_device *fixed_phy_register(unsigned int irq,
>>> + struct fixed_phy_status *status,
>>> + struct device_node *np);
>>> extern void fixed_phy_del(int phy_addr);
>>> extern int fixed_phy_set_link_update(struct phy_device *phydev,
>>> int (*link_update)(struct net_device *,
>>> @@ -27,11 +27,11 @@ static inline int fixed_phy_add(unsigned int irq, int phy_id,
>>> {
>>> return -ENODEV;
>>> }
>>> -static inline int fixed_phy_register(unsigned int irq,
>>> - struct fixed_phy_status *status,
>>> - struct device_node *np)
>>> +static inline struct phy_device *fixed_phy_register(unsigned int irq,
>>> + struct fixed_phy_status *status,
>>> + struct device_node *np)
>>> {
>>> - return -ENODEV;
>>> + return ERR_PTR(-ENODEV);
>>> }
>>> static inline int fixed_phy_del(int phy_addr)
>>> {
>>>
>>
--
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