linux-kernel - Re: [PATCH 2/2] clocksource/drivers/renesas-ostm: Add OSTM support for RZ/V2H(P) SoC

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Message-ID: <CA+V-a8ucEyNFSQQ+ZuiS6OdRk_wepPzVyFqXG8hgT6diFG=sXg@mail.gmail.com>
Date: Tue, 19 Mar 2024 09:26:14 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Chris Brandt <chris.brandt@...esas.com>, Magnus Damm <magnus.damm@...il.com>, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-renesas-soc@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 2/2] clocksource/drivers/renesas-ostm: Add OSTM support
 for RZ/V2H(P) SoC

Hi Geert,

Thank you for the review.

On Tue, Mar 19, 2024 at 8:33 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> Thanks for your patch!
>
> On Mon, Mar 18, 2024 at 5:08 PM Prabhakar <prabhakar.csengg@...ilcom> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > RZ/V2H(P) (R9A09G057) SoC has Generic Timer Module(a.k.a OSTM) which
> > needs to deassert the reset line before accessing any registers just
> > like the RZ/G2L SoC.
> >
> > Enable the entry point for RZ/V2H(P) SoC so that we can deassert
> > the reset line in probe callback.
>
> This is not really what is happening.
> As OSTM on RZ/V2H has a reset specified, the early call to ostm_init()
> through TIMER_OF_DECLARE() always fails with -EPROBE_DEFER, as resets
> are not available that early in the boot process.  Hence the driver
> needs to be reprobed later through the platform driver probe.
>
Thank you for clarification. Ill update the commit description as above.

> > While at it use IS_ENABLED() macro instead of open coding.
>
> I don't see how the code was open-coding IS_ENABLED()?
>
Ahh..

> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> > --- a/drivers/clocksource/renesas-ostm.c
> > +++ b/drivers/clocksource/renesas-ostm.c
> > @@ -224,7 +224,7 @@ static int __init ostm_init(struct device_node *np)
> >
> >  TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
> >
> > -#ifdef CONFIG_ARCH_RZG2L
> > +#if IS_ENABLED(CONFIG_ARCH_RZG2L) || IS_ENABLED(CONFIG_ARCH_R9A09G057)
>
> I think you want to use "defined()" instead of "IS_ENABLED()"?
>
OK, I will use defined().

Cheers,
Prabhakar

> >  static int __init ostm_probe(struct platform_device *pdev)
> >  {
> >         struct device *dev = &pdev->dev;
>
> 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