netdev - RE: [PATCH v3 4/6] can: rcar_canfd: Add postdiv to struct rcar_canfd_hw

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Message-ID: <OS0PR01MB592277031A4EB6184BD463F086329@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date:   Fri, 28 Oct 2022 09:36:00 +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>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        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 v3 4/6] can: rcar_canfd: Add postdiv to struct
 rcar_canfd_hw_info

Hi Geert,

Thanks for the feedback.

> Subject: Re: [PATCH v3 4/6] can: rcar_canfd: Add postdiv to struct
> rcar_canfd_hw_info
> 
> Hi Biju,
> 
> On Thu, Oct 27, 2022 at 10:22 AM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> > R-Car has a clock divider for CAN FD clock within the IP, whereas it
> > is not available on RZ/G2L.
> >
> > Add postdiv variable to struct rcar_canfd_hw_info to take care of
> this
> > difference.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > v2->v3:
> >  * Replaced data type of postdiv from unsigned int->u8 to save
> memory.
> 
> Thanks for the update!
> 
> > --- a/drivers/net/can/rcar/rcar_canfd.c
> > +++ b/drivers/net/can/rcar/rcar_canfd.c
> > @@ -1943,9 +1947,9 @@ static int rcar_canfd_probe(struct
> platform_device *pdev)
> >         }
> >         fcan_freq = clk_get_rate(gpriv->can_clk);
> >
> > -       if (gpriv->fcan == RCANFD_CANFDCLK && info->chip_id !=
> RENESAS_RZG2L)
> > +       if (gpriv->fcan == RCANFD_CANFDCLK)
> >                 /* CANFD clock is further divided by (1/2) within
> the
> > IP */
> 
> may be further divided?

Yes, It make sense. Will send v4 with this change.
/* CANFD clock may be further divided by (1/2) within the IP */

Cheers,
Biju

> 
> > -               fcan_freq /= 2;
> > +               fcan_freq /= info->postdiv;
> >
> >         addr = devm_platform_ioremap_resource(pdev, 0);
> >         if (IS_ERR(addr)) {
> 
> 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