linux-kernel - Re: [PATCH v2 2/2] clocksource/drivers/renesas-ostm: Allow OSTM driver to reprobe for RZ/V2H(P) SoC

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Date: Wed, 17 Apr 2024 17:07:29 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
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 v2 2/2] clocksource/drivers/renesas-ostm: Allow OSTM
 driver to reprobe for RZ/V2H(P) SoC

On Fri, Mar 22, 2024 at 4:13 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> The RZ/V2H(P) (R9A09G057) SoC is equipped with the Generic Timer Module,
> also known as OSTM. Similar to the RZ/G2L SoC, the OSTM on the RZ/V2H(P)
> SoC requires the reset line to be deasserted before accessing any
> registers.
>
> Early call to ostm_init() happens through TIMER_OF_DECLARE() which always
> fails with -EPROBE_DEFER, as resets are not available that early in the
> boot process.  To address this issue on the RZ/V2H(P) SoC, enable the OSTM
> driver to be reprobed through the platform driver probe mechanism.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v1->v2
> - Updated commit description
> - Dropped usage of IS_ENABLED() and used defined() instead

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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