linux-kernel - Re: [PATCH v15 2/4] phy: Add media type and speed serdes configuration interfaces

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Message-ID: <94dad8f439dd870b3488130e82f50e28b81fccf1.camel@microchip.com>
Date:   Mon, 22 Feb 2021 09:00:20 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Microchip UNG Driver List <UNGLinuxDriver@...rochip.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v15 2/4] phy: Add media type and speed serdes
 configuration interfaces

Hi Leon,

On Sun, 2021-02-21 at 07:59 +0200, Leon Romanovsky wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> On Thu, Feb 18, 2021 at 05:14:49PM +0100, Steen Hegelund wrote:
> > Provide new phy configuration interfaces for media type and speed
> > that
> > allows e.g. PHYs used for ethernet to be configured with this
> > information.
> > 
> > Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
> > Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
> > Reviewed-by: Andrew Lunn <andrew@...n.ch>
> > Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > ---
> > 

...

> >  int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
> >                union phy_configure_opts *opts);
> > @@ -344,6 +356,20 @@ static inline int phy_set_mode_ext(struct phy
> > *phy, enum phy_mode mode,
> >  #define phy_set_mode(phy, mode) \
> >       phy_set_mode_ext(phy, mode, 0)
> > 
> > +static inline int phy_set_media(struct phy *phy, enum phy_media
> > media)
> > +{
> > +     if (!phy)
> > +             return 0;
> 
> I'm curious, why do you check for the NULL in all newly introduced
> functions?
> How is it possible that calls to phy_*() supply NULL as the main
> struct?
> 
> Thanks

I do not know the history of that, but all the functions in the
interface that takes a phy as input and returns a status follow that
pattern.  Maybe Kishon and Vinod knows the origin?

> 
> > +     return -ENODEV;
> > +}
> > +
> > +static inline int phy_set_speed(struct phy *phy, int speed)
> > +{
> > +     if (!phy)
> > +             return 0;
> > +     return -ENODEV;
> > +}
> > +
> >  static inline enum phy_mode phy_get_mode(struct phy *phy)
> >  {
> >       return PHY_MODE_INVALID;
> > --
> > 2.30.0
> > 

Best Regards
Steen