linux-kernel - Re: [PATCH v4 4/4] drivers: watchdog: ast2500 and ast2600 support bootstatus

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Message-ID: <CAPSyxFQ8Dpks6c17XpF-fw9ppgoKfYfvYADvqVw2PYHNFptWTQ@mail.gmail.com>
Date: Thu, 28 Mar 2024 00:07:37 +0800
From: Chia Hsing Yin <peteryin.openbmc@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: patrick@...cx.xyz, Wim Van Sebroeck <wim@...ux-watchdog.org>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>, 
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] drivers: watchdog: ast2500 and ast2600 support bootstatus

On Wed, Mar 27, 2024 at 11:47 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 3/27/24 01:53, Peter Yin wrote:
> > Add WDIOF_EXTERN1 and WDIOF_CARDRESET bootstatus in ast2600
> >
> > 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.
> >
> > Include SCU register to veriy WDIOF_EXTERN1 in ast2600 SCU74 or
> > ast2500 SCU3C when bit1 is set.
> >
> > Signed-off-by: Peter Yin <peteryin.openbmc@...il.com>
> > ---
> >   drivers/watchdog/aspeed_wdt.c | 60 +++++++++++++++++++++++++----------
> >   1 file changed, 44 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> > index b4773a6aaf8c..29e9afdee619 100644
> > --- a/drivers/watchdog/aspeed_wdt.c
> > +++ b/drivers/watchdog/aspeed_wdt.c
> > @@ -11,10 +11,12 @@
> >   #include <linux/io.h>
> >   #include <linux/kernel.h>
> >   #include <linux/kstrtox.h>
> > +#include <linux/mfd/syscon.h>
> >   #include <linux/module.h>
> >   #include <linux/of.h>
> >   #include <linux/of_irq.h>
> >   #include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> >   #include <linux/watchdog.h>
> >
> >   static bool nowayout = WATCHDOG_NOWAYOUT;
> > @@ -65,23 +67,32 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
> >   #define WDT_RELOAD_VALUE    0x04
> >   #define WDT_RESTART         0x08
> >   #define WDT_CTRL            0x0C
> > -#define   WDT_CTRL_BOOT_SECONDARY    BIT(7)
> > -#define   WDT_CTRL_RESET_MODE_SOC    (0x00 << 5)
> > -#define   WDT_CTRL_RESET_MODE_FULL_CHIP      (0x01 << 5)
> > -#define   WDT_CTRL_RESET_MODE_ARM_CPU        (0x10 << 5)
> > -#define   WDT_CTRL_1MHZ_CLK          BIT(4)
> > -#define   WDT_CTRL_WDT_EXT           BIT(3)
> > -#define   WDT_CTRL_WDT_INTR          BIT(2)
> > -#define   WDT_CTRL_RESET_SYSTEM              BIT(1)
> > -#define   WDT_CTRL_ENABLE            BIT(0)
> > +#define WDT_CTRL_BOOT_SECONDARY      BIT(7)
> > +#define WDT_CTRL_RESET_MODE_SOC      (0x00 << 5)
> > +#define WDT_CTRL_RESET_MODE_FULL_CHIP        (0x01 << 5)
> > +#define WDT_CTRL_RESET_MODE_ARM_CPU  (0x10 << 5)
> > +#define WDT_CTRL_1MHZ_CLK            BIT(4)
> > +#define WDT_CTRL_WDT_EXT             BIT(3)
> > +#define WDT_CTRL_WDT_INTR            BIT(2)
> > +#define WDT_CTRL_RESET_SYSTEM                BIT(1)
> > +#define WDT_CTRL_ENABLE              BIT(0)
> >   #define WDT_TIMEOUT_STATUS  0x10
> > -#define   WDT_TIMEOUT_STATUS_IRQ             BIT(2)
> > -#define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY  BIT(1)
> > +#define WDT_TIMEOUT_STATUS_IRQ               BIT(2)
> > +#define WDT_TIMEOUT_STATUS_BOOT_SECONDARY    BIT(1)
> > +#define WDT_TIMEOUT_STATUS_EVENT             BIT(0)
> >   #define WDT_CLEAR_TIMEOUT_STATUS    0x14
> > -#define   WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION  BIT(0)
> > +#define WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION    BIT(0)
> >   #define WDT_RESET_MASK1             0x1c
> >   #define WDT_RESET_MASK2             0x20
> >
>
> The above bit value defines were indented to show what is
> registers and what is register bit values. Why are you
> changing that other than for personal preference ?
>
> Guenter
>
Oh! I'm sorry, I didn't realize this was a rule. I thought it was just
an alignment issue. I will revert it in the next version. Thank you
for explaining.