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Message-ID: <f0b03c0b-eb54-420e-a4f7-8286e20b9df6@roeck-us.net>
Date: Wed, 27 Mar 2024 08:47:53 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Peter Yin <peteryin.openbmc@...il.com>, 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 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
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