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Message-ID: <3eec9b79-0505-0b15-f7a0-fcc7f4031c85@roeck-us.net>
Date: Thu, 13 Jul 2023 10:21:30 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: huaqian.li@...mens.com, wim@...ux-watchdog.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: huaqianlee@...il.com, nm@...com, vigneshr@...com,
kristo@...nel.org, linux-watchdog@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, jan.kiszka@...mens.com,
baocheng.su@...mens.com
Subject: Re: [PATCH v3 0/3] Add support for WDIOF_CARDRESET on TI AM65x
On 7/13/23 02:51, huaqian.li@...mens.com wrote:
> From: Li Hua Qian <huaqian.li@...mens.com>
>
> The watchdog hardware of TI AM65X platform does not support
> WDIOF_CARDRESET feature, add a reserved memory to save the watchdog
> reset cause, to know if the board reboot is due to a watchdog reset.
>
One thing I keep wondering about: What prevents the Linux kernel from
treating the special memory area like normal memory ? I would have expected
some usage note, such as that the memory area must be reported as reserved
to the kernel, but I don't see anything like that.
Guenter
> Changes in v3:
> - Add memory-region back for the reserved memory, and remove reserved
> memory from the watchdog IO address space.
> - Add changelog.
> - Link to v2:
> https://lore.kernel.org/linux-watchdog/20230711091713.1113010-1-huaqian.li@siemens.com
>
> Changes in v2:
> - Remove memory-region and memory-size properties, and bind the reserved
> memory to watchdog IO address space.
> - Remove the unnecessary rti_wdt_ioctl.
> - Fix the mail list
> - Link to v1:
> https://lore.kernel.org/all/3137d87e56ef75ba0b8a923d407b2fecace6ccbd.camel@siemens.com/
> v1 had a wrong mail list at the beginning, and the mail thread was
> messed up.
>
> Li Hua Qian (3):
> dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET
> arm64: dts: ti: Add reserved memory for watchdog
> watchdog:rit_wdt: Add support for WDIOF_CARDRESET
>
> .../bindings/watchdog/ti,rti-wdt.yaml | 12 +++++
> .../boot/dts/ti/k3-am65-iot2050-common.dtsi | 10 ++++
> drivers/watchdog/rti_wdt.c | 51 +++++++++++++++++++
> 3 files changed, 73 insertions(+)
>
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