linux-kernel - Re: [PATCH 2/5] phy: core: add PHY_MODE

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Date:   Thu, 8 Nov 2018 12:12:15 -0600
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
CC:     "David S. Miller" <davem@...emloft.net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        Manu Gautam <mgautam@...eaurora.org>,
        Tony Lindgren <tony@...mide.com>, <netdev@...r.kernel.org>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Carlo Caione <carlo@...one.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 2/5] phy: core: add PHY_MODE_ETHERNET

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@...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