linux-kernel - Re: [PATCH v11 3/4] phy: Add Sparx5 ethernet serdes PHY driver

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Message-ID: <20210104142057.GL31158@unreal>
Date:   Mon, 4 Jan 2021 16:20:57 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Steen Hegelund <steen.hegelund@...rochip.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        linux-arm-kernel@...ts.infradead.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 v11 3/4] phy: Add Sparx5 ethernet serdes PHY driver

On Mon, Jan 04, 2021 at 02:16:38PM +0100, Steen Hegelund wrote:
> Hi Leon,
>
>
> On Mon, 2021-01-04 at 14:15 +0200, Leon Romanovsky wrote:
> >
> > <...>
> >
> > > +struct sparx5_sd10g28_args {
> > > +     bool                 skip_cmu_cfg; /* Enable/disable CMU cfg
> > > */
> > > +     bool                 no_pwrcycle;  /* Omit initial power-
> > > cycle */
> > > +     bool                 txinvert;     /* Enable inversion of
> > > output data */
> > > +     bool                 rxinvert;     /* Enable inversion of
> > > input data */
> > > +     bool                 txmargin;     /* Set output level to 
> > > half/full */
> > > +     u16                  txswing;      /* Set output level */
> > > +     bool                 mute;         /* Mute Output Buffer */
> > > +     bool                 is_6g;
> > > +     bool                 reg_rst;
> > > +};
> >
> > All those bools in structs can be squeezed into one u8, just use
> > bitfields, e.g. "u8 a:1;".
>
> Got you.
>
> >
> > Also I strongly advise do not do vertical alignment, it will cause to
> > too many churn later when this code will be updated.
>
> So just a single space between the type and the name and the comment is
> preferable?

Yes, use clang formatter over your code, it will change everything to be
aligned to kernel coding style.
https://linuxplumbersconf.org/event/7/contributions/803/

>
> >
> > > +
> >
> > <...>
> >
> > > +static inline void __iomem *sdx5_addr(void __iomem *base[],
> > > +                                   int id, int tinst, int tcnt,
> > > +                                   int gbase, int ginst,
> > > +                                   int gcnt, int gwidth,
> > > +                                   int raddr, int rinst,
> > > +                                   int rcnt, int rwidth)
> > > +{
> > > +#if defined(CONFIG_DEBUG_KERNEL)
> > > +     WARN_ON((tinst) >= tcnt);
> > > +     WARN_ON((ginst) >= gcnt);
> > > +     WARN_ON((rinst) >= rcnt);
> > > +#endif
> >
> > Please don't put "#if defined(CONFIG_DEBUG_KERNEL)", print WARN_ON().
>
> OK, I will drop the #if and keep the WARN_ON...

Thanks