netdev - Re: [net-next 4/5] net: ethernet: renesas: rcar_gen4

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Date: Sat, 18 Nov 2023 12:16:51 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org
Subject: Re: [net-next 4/5] net: ethernet: renesas: rcar_gen4_ptp: Add V4H
 clock setting

Hi Niklas,

On Fri, Nov 17, 2023 at 5:45 PM Niklas Söderlund
<niklas.soderlund+renesas@...natech.se> wrote:
> The gPTP clock is different between R-Car S4 and R-Car V4H. In
> preparation of adding R-Car V4H support define the clock setting.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Thanks for your patch!

> --- a/drivers/net/ethernet/renesas/rcar_gen4_ptp.h
> +++ b/drivers/net/ethernet/renesas/rcar_gen4_ptp.h
> @@ -9,8 +9,12 @@
>
>  #include <linux/ptp_clock_kernel.h>
>
> -#define PTPTIVC_INIT                   0x19000000      /* 320MHz */
> -#define RCAR_GEN4_PTP_CLOCK_S4         PTPTIVC_INIT
> +#define PTPTIVC_INIT_200MHZ            0x28000000      /* 200MHz */
> +#define PTPTIVC_INIT_320MHZ            0x19000000      /* 320MHz */
> +
> +#define RCAR_GEN4_PTP_CLOCK_S4         PTPTIVC_INIT_320MHZ
> +#define RCAR_GEN4_PTP_CLOCK_V4H                PTPTIVC_INIT_200MHZ

I think the gPTP Timer Increment Value Configuration value should be
calculated from the module clock rate instead (rsw2 runs at 320 MHz
on R-Car S4, S0D4_HSC and tsn run at 200 MHz on R-Car V4H).

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