linux-kernel - Re: [RFC PATCH net-next v3 13/20] net: dsa: qca8k: make rgmii delay configurable

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Message-ID: <20210507085112.2n4dx5phgbjczc4r@skbuf>
Date:   Fri, 7 May 2021 11:51:12 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v3 13/20] net: dsa: qca8k: make rgmii delay
 configurable

On Thu, May 06, 2021 at 11:53:36PM +0200, Ansuel Smith wrote:
> On Thu, May 06, 2021 at 02:10:33PM +0300, Vladimir Oltean wrote:
> > On Wed, May 05, 2021 at 12:29:07AM +0200, Ansuel Smith wrote:
> > > The legacy qsdk code used a different delay instead of the max value.
> > > Qsdk use 1 ps for rx and 2 ps for tx. Make these values configurable
> > > using the standard rx/tx-internal-delay-ps ethernet binding and apply
> > > qsdk values by default. The connected gmac doesn't add any delay so no
> > > additional delay is added to tx/rx.
> > > 
> > > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > > ---
> > >  drivers/net/dsa/qca8k.c | 51 +++++++++++++++++++++++++++++++++++++++--
> > >  drivers/net/dsa/qca8k.h | 11 +++++----
> > >  2 files changed, 55 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> > > index 22334d416f53..cb9b44769e92 100644
> > > --- a/drivers/net/dsa/qca8k.c
> > > +++ b/drivers/net/dsa/qca8k.c
> > > @@ -779,6 +779,47 @@ qca8k_setup_mdio_bus(struct qca8k_priv *priv)
> > >  	return 0;
> > >  }
> > >  
> > > +static int
> > > +qca8k_setup_of_rgmii_delay(struct qca8k_priv *priv)
> > > +{
> > > +	struct device_node *ports, *port;
> > > +	u32 val;
> > > +
> > > +	ports = of_get_child_by_name(priv->dev->of_node, "ports");
> > 
> > Consider falling back to searching for the "ethernet-ports" name too,
> > DSA should now support both.
> >
> 
> The function qca8k_setup_mdio_bus also checks for ports node. Should I
> also there the fallback correct?

Yes, ideally the entire driver should work fine with "ethernet-ports"
and not just pieces of it.