netdev - Re: [EXT] Re: [PATCH v2 RFC net-next 04/18] net: mvpp2: add PPv23 version definition

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Message-ID: <YA3ElJbfk9Km2HiF@lunn.ch>
Date:   Sun, 24 Jan 2021 20:03:48 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Stefan Chulski <stefanc@...vell.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "atenart@...nel.org" <atenart@...nel.org>
Subject: Re: [EXT] Re: [PATCH v2 RFC net-next 04/18] net: mvpp2: add PPv23
 version definition

On Sun, Jan 24, 2021 at 01:55:42PM +0000, Stefan Chulski wrote:
> > > Signed-off-by: Stefan Chulski <stefanc@...vell.com>
> > > ---
> > >  drivers/net/ethernet/marvell/mvpp2/mvpp2.h      | 24 ++++++++++++------
> > --
> > >  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 17 +++++++++-----
> > >  2 files changed, 25 insertions(+), 16 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> > > b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> > > index aec9179..89b3ede 100644
> > > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> > > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> > > @@ -60,6 +60,9 @@
> > >  /* Top Registers */
> > >  #define MVPP2_MH_REG(port)			(0x5040 + 4 * (port))
> > >  #define MVPP2_DSA_EXTENDED			BIT(5)
> > > +#define MVPP2_VER_ID_REG			0x50b0
> > > +#define MVPP2_VER_PP22				0x10
> > > +#define MVPP2_VER_PP23				0x11
> > 
> > Looking at the Armada 8040 docs, it seems this register exists on
> > PPv2.1 as well, and holds the value zero there.
> > 
> > I wonder whether we should instead read it's value directly into hw_version,
> > and test against these values, rather than inventing our own verison enum.
> > 
> > I've also been wondering whether your != MVPP21 comparisons should
> > instead be >= MVPP22.
> > 
> > Any thoughts?
> 
> We cannot access PPv2 register space before enabling clocks(done in mvpp2_probe) , PP21 and PP22/23 have different sets of clocks.

> So diff between PP21 and PP22/23 should be stored in device tree(in
> of_device_id), with MVPP22 and MVPP21 stored as .data

Hi Stefan

As far as i can see, you are not adding a new compatible. So
'marvell,armada-7k-pp2' means PPv2.2 and PPv2.3? It would be good to
update the comment at the beginning of marvell-pp2.txt to indicate
this.

	Andrew