netdev - RE: [PATCH net-next v4 00/12] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface

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Date: Fri, 7 Jun 2024 04:40:33 +0000
From: Selvamani Rajagopal <Selvamani.Rajagopal@...emi.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "Parthiban.Veerasooran@...rochip.com"
	<Parthiban.Veerasooran@...rochip.com>,
        Piergiorgio Beruto
	<Pier.Beruto@...emi.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org"
	<kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "horms@...nel.org" <horms@...nel.org>,
        "saeedm@...dia.com"
	<saeedm@...dia.com>,
        "anthony.l.nguyen@...el.com"
	<anthony.l.nguyen@...el.com>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
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	<robh+dt@...nel.org>,
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	<krzysztof.kozlowski+dt@...aro.org>,
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	<conor+dt@...nel.org>,
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	<devicetree@...r.kernel.org>,
        "Horatiu.Vultur@...rochip.com"
	<Horatiu.Vultur@...rochip.com>,
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	<ruanjinjie@...wei.com>,
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	<Steen.Hegelund@...rochip.com>,
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	<UNGLinuxDriver@...rochip.com>,
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	<Thorsten.Kummermehr@...rochip.com>,
        "Nicolas.Ferre@...rochip.com"
	<Nicolas.Ferre@...rochip.com>,
        "benjamin.bigler@...nformulastudent.ch"
	<benjamin.bigler@...nformulastudent.ch>,
        Viliam Vozar
	<Viliam.Vozar@...emi.com>,
        Arndt Schuebel <Arndt.Schuebel@...emi.com>
Subject: RE: [PATCH net-next v4 00/12] Add support for OPEN Alliance
 10BASE-T1x MACPHY Serial Interface



> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Thursday, June 6, 2024 6:12 AM
> To: Selvamani Rajagopal <Selvamani.Rajagopal@...emi.com>
> Cc: Parthiban.Veerasooran@...rochip.com; Piergiorgio Beruto
> <Pier.Beruto@...emi.com>; davem@...emloft.net;
> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> horms@...nel.org; saeedm@...dia.com; anthony.l.nguyen@...el.com;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; corbet@....net;
> linux-doc@...r.kernel.org; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.org;
> devicetree@...r.kernel.org; Horatiu.Vultur@...rochip.com;
> ruanjinjie@...wei.com; Steen.Hegelund@...rochip.com;
> vladimir.oltean@....com; UNGLinuxDriver@...rochip.com;
> Thorsten.Kummermehr@...rochip.com; Nicolas.Ferre@...rochip.com;
> benjamin.bigler@...nformulastudent.ch; Viliam Vozar
> <Viliam.Vozar@...emi.com>; Arndt Schuebel
> <Arndt.Schuebel@...emi.com>
> Subject: Re: [PATCH net-next v4 00/12] Add support for OPEN Alliance
> 10BASE-T1x MACPHY Serial Interface
> 
> [External Email]: This email arrived from an external source - Please
> exercise caution when opening any attachments or clicking on links.
> 
> > I believe my client is configured to wrap at 70th characters.
> > Not sure why it is not doing it.
> 
> 
> It could be you also send a MIME obfuscated copy which is not wrapped
> correctly?
> 
> > > > 1) Can we move memory map selector definitions
> > > (OA_TC6_PHY_C45_PCS_MMS2 and other 4 definitions) to the header
> > > file
> > > >      include/linux/oa_tc6.h?
> > > >      Also, if possible, could we add the MMS0, MMS1?. Our driver is
> > > using them. Of course, we could add it when we submit our driver.
> > >
> > > Interesting. So you have vendor registers outside of MMS 10-15?
> >
> > This is not about vendor registers. The current oa_tc6 defines
> > MMS selector values for 2, 3, 4, 5, 6. I am asking, if 0, 1 can be added,
> > which are meant for "Standard Control and Status" and MAC
> respectively,
> > according to MMS assignment table 6 on OA standard.
> 
> But why would a MAC driver need access to those? Everything using
> those registers should be defined in the standard. So the framework
> should handle them.
> 
> > One example I can think of is, to handle PHYINT status bit
> > that may be set in STATUS0 register. Another example could be,
> > to give a vendor flexibility to not to use interrupt mode.
> 
> But that is part of the standard. Why would a driver need to do
> anything, the framework should handle PHYINT, calling
> phy_mac_interrupt(phydev).
> 
> I really think you need to post patches. We can then discuss each use
> case, and i can give you concrete feedback.


True.  That would be better. Will work on the patches so that it is clear.


> 
> But in general, if it is part of the standard it should be in the
> framework. Support for features which are not part of the standard,
> and workarounds for where a device violates the standard, should be in
> the MAC driver, or the PHY driver.
> 
> 	Andrew