[PATCH net-next] of: mdio: honor flags passed to of_phy_connect

[PATCH net-next] of: mdio: honor flags passed to of_phy_connect

[Florian Fainelli]

Commit f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach,
connect, connect_direct}") removed the flags argument to the PHY library
calls to: phy_{attach,connect,connect_direct}.

Most Device Tree aware drivers call of_phy_connect() with the flag
argument set to 0, but some of them might want to set a different value
there in order for the PHY driver to key a specific behavior based on
the phy_device::dev_flags value.

Allow such drivers to set custom dev_flags as part of the
of_phy_connect() call since of_phy_connect() does start the PHY state
machine, it will call into the PHY driver config_init() callback which
is usually where a specific phy_flags value is important.

Fixes: f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach, connect, connect_direct}")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
David,

This is applicable to 3.9 and newer, thanks!

 drivers/of/of_mdio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 401b2453da45..a85d80012993 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -224,6 +224,8 @@ struct phy_device *of_phy_connect(struct net_device *dev,
 	if (!phy)
 		return NULL;
 
+	phy->dev_flags = flags;
+
 	return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
 }
 EXPORT_SYMBOL(of_phy_connect);
-- 
1.9.1

Re: [PATCH net-next] of: mdio: honor flags passed to of_phy_connect

[David Miller]

From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 16 Sep 2014 10:49:36 -0700

> Commit f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach,
> connect, connect_direct}") removed the flags argument to the PHY library
> calls to: phy_{attach,connect,connect_direct}.
> 
> Most Device Tree aware drivers call of_phy_connect() with the flag
> argument set to 0, but some of them might want to set a different value
> there in order for the PHY driver to key a specific behavior based on
> the phy_device::dev_flags value.
> 
> Allow such drivers to set custom dev_flags as part of the
> of_phy_connect() call since of_phy_connect() does start the PHY state
> machine, it will call into the PHY driver config_init() callback which
> is usually where a specific phy_flags value is important.
> 
> Fixes: f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach, connect, connect_direct}")
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

I do not see anyone passing non-zero in as the flags argument.

It is difficult for me to determine the impact of this patch,
whether it should really go to 'net' and/or 'stable', etc.
if you don't tell me who this could possibly break.

It's even worse when I do all of the searching around and
cannot find a breakage case myself. :-/

Re: [PATCH net-next] of: mdio: honor flags passed to of_phy_connect

[Florian Fainelli]

On 09/16/2014 01:39 PM, David Miller wrote:
> From: Florian Fainelli <f.fainelli@gmail.com>
> Date: Tue, 16 Sep 2014 10:49:36 -0700
> 
>> Commit f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach,
>> connect, connect_direct}") removed the flags argument to the PHY library
>> calls to: phy_{attach,connect,connect_direct}.
>>
>> Most Device Tree aware drivers call of_phy_connect() with the flag
>> argument set to 0, but some of them might want to set a different value
>> there in order for the PHY driver to key a specific behavior based on
>> the phy_device::dev_flags value.
>>
>> Allow such drivers to set custom dev_flags as part of the
>> of_phy_connect() call since of_phy_connect() does start the PHY state
>> machine, it will call into the PHY driver config_init() callback which
>> is usually where a specific phy_flags value is important.
>>
>> Fixes: f9a8f83b04e0 ("net: phy: remove flags argument from phy_{attach, connect, connect_direct}")
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> 
> I do not see anyone passing non-zero in as the flags argument.

Right, I have a follow-up patch that will pass non-zero, I will just
submit everything at once so it is clear in what context and purpose
this gets used.

Thanks!

> 
> It is difficult for me to determine the impact of this patch,
> whether it should really go to 'net' and/or 'stable', etc.
> if you don't tell me who this could possibly break.
> 
> It's even worse when I do all of the searching around and
> cannot find a breakage case myself. :-/
> 

Re: [PATCH net-next] of: mdio: honor flags passed to of_phy_connect

[David Miller]

From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 16 Sep 2014 13:47:08 -0700

> Right, I have a follow-up patch that will pass non-zero, I will just
> submit everything at once so it is clear in what context and purpose
> this gets used.

That would work a lot better, thanks.