linux-kernel - Re: [PATCH v7 1/1] drivers: watchdog: revise watchdog bootstatus

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Date: Fri, 26 Apr 2024 10:11:57 +0930
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: Peter Yin <peteryin.openbmc@...il.com>, patrick@...cx.xyz, Wim Van
 Sebroeck <wim@...ux-watchdog.org>, Guenter Roeck <linux@...ck-us.net>, Joel
 Stanley <joel@....id.au>, linux-watchdog@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/1] drivers: watchdog: revise watchdog bootstatus

On Thu, 2024-04-25 at 17:07 +0800, Peter Yin wrote:
> Regarding the AST2600 specification, the WDTn Timeout Status Register
> (WDT10) has bit 1 reserved. Bit 1 of the status register indicates
> on ast2500 if the boot was from the second boot source.
> It does not indicate that the most recent reset was triggered by
> the watchdog. The code should just be changed to set WDIOF_CARDRESET
> if bit 0 of the status register is set. However, this bit can be clear when
> watchdog register 0x0c bit1(Reset System after timeout) is enabled.
> Thereforce include SCU register to veriy WDIOF_EXTERN1 and WDIOF_CARDRESET
> in ast2600 SCU74 or ast2400/ast2500 SCU3C.
> 
> Signed-off-by: Peter Yin <peteryin.openbmc@...il.com>
> ---
>  drivers/watchdog/aspeed_wdt.c | 109 ++++++++++++++++++++++++++++++++--
>  1 file changed, 103 insertions(+), 6 deletions(-)

After this patch the probe() implementation is ~250loc with a whole
bunch of conditional behaviours based on the SoC version. Maybe it's
time to break it up into version-specific functions that are called
from the probe() implementation?

Andrew