netdev - RE: [PATCH 1/6] can: rcar_canfd: rcar_canfd_probe: Add struct rcar_canfd_hw

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Date:   Mon, 24 Oct 2022 17:23:52 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Stefan Mätje <stefan.maetje@....eu>,
        Ulrich Hecht <uli+renesas@...nd.eu>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH 1/6] can: rcar_canfd: rcar_canfd_probe: Add struct
 rcar_canfd_hw_info to driver data

Hi Geert,

Thanks for the feedback.

> Subject: Re: [PATCH 1/6] can: rcar_canfd: rcar_canfd_probe: Add struct
> rcar_canfd_hw_info to driver data
> 
> Hi Biju,
> 
> On Sat, Oct 22, 2022 at 1:02 PM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> > The CAN FD IP found on RZ/G2L SoC has some HW features different to
> > that of R-Car. For example, it has multiple resets and multiple IRQs
> > for global and channel interrupts. Also, it does not have ECC error
> > flag registers and clk post divider present on R-Car. Similarly, R-
> Car
> > V3U has 8 channels whereas other SoCs has only 2 channels.
> >
> > This patch adds the struct rcar_canfd_hw_info to take care of the HW
> > feature differences and driver data present on both IPs. It also
> > replaces the driver data chip type with struct rcar_canfd_hw_info by
> > moving chip type to it.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/net/can/rcar/rcar_canfd.c
> > +++ b/drivers/net/can/rcar/rcar_canfd.c
> 
> > @@ -591,10 +595,22 @@ static const struct can_bittiming_const
> rcar_canfd_bittiming_const = {
> >         .brp_inc = 1,
> >  };
> >
> > +static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
> > +       .chip_id = RENESAS_RCAR_GEN3,
> > +};
> > +
> > +static const struct rcar_canfd_hw_info rzg2l_hw_info = {
> > +       .chip_id = RENESAS_RZG2L,
> > +};
> > +
> > +static const struct rcar_canfd_hw_info r8a779a0_hw_info = {
> > +       .chip_id = RENESAS_R8A779A0,
> > +};
> > +
> >  /* Helper functions */
> >  static inline bool is_v3u(struct rcar_canfd_global *gpriv)  {
> > -       return gpriv->chip_id == RENESAS_R8A779A0;
> > +       return gpriv->info == &r8a779a0_hw_info;
> 
> "return gpriv->info->chip_id == RENESAS_R8A779A0;" would match all the
> other changes you make. But I see why you did it this way...
> ((most) users of is_v3u() are not converted to feature flags (yet) ;-)

Yep, that is correct. Chip_id() is being removed in subsequent patches
Otherwise I need to create separate patch for this change alone.

Cheers,
Biju

> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --
> geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a
> hacker. But when I'm talking to journalists I just say "programmer" or
> something like that.
>                                 -- Linus Torvalds