[PATCH 2/5] phy: core: add PHY_MODE_ETHERNET

[grygorii.strashko@ti.com (Grygorii Strashko)]

hi Russell,

On 11/7/18 6:42 PM, Russell King - ARM Linux wrote:
> On Wed, Nov 07, 2018 at 06:36:14PM -0600, Grygorii Strashko wrote:
>> Add new PHY's mode to be used by Ethernet PHY interface drivers or
>> multipurpose PHYs like serdes. It will be reused in further changes.
>>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
>> ---
>>   include/linux/phy/phy.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
>> index b17e770..02c9ef0 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -42,6 +42,7 @@ enum phy_mode {
>>   	PHY_MODE_UFS_HS_A,
>>   	PHY_MODE_UFS_HS_B,
>>   	PHY_MODE_PCIE,
>> +	PHY_MODE_ETHERNET,
> 
> Are you sure about this - we already have a bunch of "ethernet" modes
> that are more specific, like PHY_MODE_SGMII, PHY_MODE_2500SGMII and
> PHY_MODE_10GKR which require PHYs to be configured differently.  Having
> a very generic "ethernet" mode brings up questions about when it should
> be used vs the more specific modes.

yes. the idea of this series is to split PHY mode on - PHY mode (generic)
and PHY submode (subsystem specific), so multi-functional PHY like serdes will do
(for example):

  phy_set_mode_ext(port->comphy, PHY_MODE_ETHERNET, PHY_INTERFACE_MODE_SGMII);
  where PHY_INTERFACE_MODE_SGMII is defined by phy_interface_t enum.

instead of

  phy_set_mode(port->comphy, PHY_MODE_SGMII);

In patches 3-5 I've converted users of existing PHY "ethernet" modes to use
this approach and, finally, in patch 5 removed
    PHY_MODE_SGMII/2500SGMII/QSGMII/10GKR

> 
> (I've already mentioned that the SGMII modes are mis-named, since
> they also apply to 1000base-X and 2500base-X - the only difference
> is how one 16-bit word in the data stream is used which has no effect
> on the PHY.)
> 

-- 
regards,
-grygorii