lkml.org 
[lkml]   [2023]   [Jul]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v6 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET
From
On 7/17/23 19:10, huaqian.li@siemens.com wrote:
> From: Li Hua Qian <huaqian.li@siemens.com>
>
> TI RTI (Real Time Interrupt) Watchdog doesn't support to record the
> watchdog cause. Add a reserved memory to know the last reboot was caused
> by the watchdog card. In the reserved memory, some specific info will be
> saved to indicate whether the watchdog reset was triggered in last
> boot.
>
> Signed-off-by: Li Hua Qian <huaqian.li@siemens.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> .../bindings/watchdog/ti,rti-wdt.yaml | 28 ++++++++++++++++++-
> 1 file changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> index fc553211e42d..9d847e4b7278 100644
> --- a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> @@ -34,6 +34,20 @@ properties:
> power-domains:
> maxItems: 1
>
> + memory-region:
> + maxItems: 1
> + description:
> + Contains the watchdog reserved memory. It is optional.
> + In the reserved memory, the specified values, which are
> + PON_REASON_SOF_NUM(0xBBBBCCCC), PON_REASON_MAGIC_NUM(0xDDDDDDDD),
> + and PON_REASON_EOF_NUM(0xCCCCBBBB), are pre-stored at the first
> + 3 * 4 bytes to tell that last boot was caused by watchdog reset.
> + Once the PON reason is captured by driver(rti_wdt.c), the driver
> + is supposed to wipe the whole memory region. Surely, if this
> + property is set, at least 12 bytes reserved memory starting from
> + specific memory address(0xa220000) should be set. More please
> + refer to example.
> +
> required:
> - compatible
> - reg
> @@ -47,7 +61,18 @@ examples:
> /*
> * RTI WDT in main domain on J721e SoC. Assigned clocks are used to
> * select the source clock for the watchdog, forcing it to tick with
> - * a 32kHz clock in this case.
> + * a 32kHz clock in this case. Add a reserved memory(optional) to keep
> + * the watchdog reset cause persistent, which was be written in 12 bytes
> + * starting from 0xa2200000 by RTI Watchdog Firmware, then make it
> + * possible to get watchdog reset cause in driver.
> + *
> + * Reserved memory should be defined as follows:
> + * reserved-memory {
> + * wdt_reset_memory_region: wdt-memory@a2200000 {
> + * reg = <0x00 0xa2200000 0x00 0x1000>;
> + * no-map;
> + * };
> + * }
> */
> #include <dt-bindings/soc/ti,sci_pm_domain.h>
>
> @@ -58,4 +83,5 @@ examples:
> power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>;
> assigned-clocks = <&k3_clks 252 1>;
> assigned-clock-parents = <&k3_clks 252 5>;
> + memory-region = <&wdt_reset_memory_region>;
> };

\
 
 \ /
  Last update: 2023-07-19 15:39    [W:0.058 / U:0.460 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site