linux-kernel - Re: [PATCH 2/2] net: dsa: b53: mdio: add support for BCM53134

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Date:   Thu, 23 Mar 2023 23:13:26 +0100
From:   Álvaro Fernández Rojas <noltari@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Paul Geurts <paul.geurts@...drive-technologies.com>,
        "jonas.gorski@...il.com" <jonas.gorski@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "olteanv@...il.com" <olteanv@...il.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>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: dsa: b53: mdio: add support for BCM53134

El jue, 23 mar 2023 a las 22:02, Florian Fainelli
(<f.fainelli@...il.com>) escribió:
>
> On 3/23/23 13:10, Paul Geurts wrote:
> >> -----Original Message-----
> >> From: Florian Fainelli <f.fainelli@...il.com>
> >> Sent: donderdag 23 maart 2023 17:43
> >> To: Álvaro Fernández Rojas <noltari@...il.com>; Paul Geurts
> >> <paul.geurts@...drive-technologies.com>; jonas.gorski@...il.com;
> >> andrew@...n.ch; olteanv@...il.com; davem@...emloft.net;
> >> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> >> robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> >> netdev@...r.kernel.org; devicetree@...r.kernel.org; linux-
> >> kernel@...r.kernel.org
> >> Subject: Re: [PATCH 2/2] net: dsa: b53: mdio: add support for BCM53134
> >>
> >> On 3/23/23 05:18, Álvaro Fernández Rojas wrote:
> >>> From: Paul Geurts <paul.geurts@...drive-technologies.com>
> >>>
> >>> Add support for the BCM53134 Ethernet switch in the existing b53 dsa
> >> driver.
> >>> BCM53134 is very similar to the BCM58XX series.
> >>>
> >>> Signed-off-by: Paul Geurts <paul.geurts@...drive-technologies.com>
> >>> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> >>> ---
> >>>    drivers/net/dsa/b53/b53_common.c | 53
> >> +++++++++++++++++++++++++++++++-
> >>>    drivers/net/dsa/b53/b53_mdio.c   |  5 ++-
> >>>    drivers/net/dsa/b53/b53_priv.h   |  9 +++++-
> >>>    3 files changed, 64 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/drivers/net/dsa/b53/b53_common.c
> >>> b/drivers/net/dsa/b53/b53_common.c
> >>> index 1f9b251a5452..aaa0813e6f59 100644
> >>> --- a/drivers/net/dsa/b53/b53_common.c
> >>> +++ b/drivers/net/dsa/b53/b53_common.c
> >>> @@ -1282,6 +1282,42 @@ static void b53_adjust_link(struct dsa_switch
> >> *ds, int port,
> >>>     if (is63xx(dev) && port >= B53_63XX_RGMII0)
> >>>             b53_adjust_63xx_rgmii(ds, port, phydev->interface);
> >>>
> >>> +   if (is53134(dev) && phy_interface_is_rgmii(phydev)) {
> >>
> >> Why is not this in the same code block as the one for the is531x5() device like
> >> this:
> >>
> >> diff --git a/drivers/net/dsa/b53/b53_common.c
> >> b/drivers/net/dsa/b53/b53_common.c
> >> index 59cdfc51ce06..1c64b6ce7e78 100644
> >> --- a/drivers/net/dsa/b53/b53_common.c
> >> +++ b/drivers/net/dsa/b53/b53_common.c
> >> @@ -1235,7 +1235,7 @@ static void b53_adjust_link(struct dsa_switch *ds,
> >> int port,
> >>                                 tx_pause, rx_pause);
> >>           b53_force_link(dev, port, phydev->link);
> >>
> >> -       if (is531x5(dev) && phy_interface_is_rgmii(phydev)) {
> >> +       if ((is531x5(dev) || is53134(dev)) &&
> >> phy_interface_is_rgmii(phydev)) {
> >>                   if (port == dev->imp_port)
> >>                           off = B53_RGMII_CTRL_IMP;
> >>                   else
> >>
> >> Other than that, LGTM!
> >> --
> >> Florian
> >
> > I think the only reason is that the BCM53134 does not support the
> > RGMII_CTRL_TIMING_SEL bit, which is set in the original block. I agree
> > Putting a if statement around
> > rgmii_ctrl |= RGMII_CTRL_TIMING_SEL;
> > would prevent a lot of code duplication. _however_, after looking at it again,
> > I don’t think the device does not support the bit. When looking at the datasheet,
> > The same bit in the this register is called BYPASS_2NS_DEL. It's very uncommon
> > For Broadcom to make such a change in the register interface, so maybe they
> > Just renamed it. Do you think this could be the same bit?
>
> Yes, I think this is exactly the same bit, just named differently. What
> strikes me as odd is that neither of the 53115, 53125 or 53128 which are
> guarded by the is531x5() conditional have it defined.

If this is true then we can safely add 53134 to is531x5() conditional
and reuse the existing code.

> --
> Florian
>

--
Álvaro