Re: [PATCH v14 0/4] Watchdog: introduce ARM SBSA watchdog driver

[Wim Van Sebroeck]

Hi Fu,

> From: Fu Wei <fu.wei@xxxxxxxxxx>
> 
> This patchset:
>     (1)Introduce Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
>     for FDT info of SBSA Generic Watchdog, and give two examples of
>     adding SBSA Generic Watchdog device node into the dts files:
>     foundation-v8.dts and amd-seattle-soc.dtsi.
> 
>     (2)Introduce ARM SBSA watchdog driver:
>         a.Use linux kernel watchdog framework;
>         b.Work with FDT on ARM64;
>         c.Support getting timeout from parameter and FDT at the driver
>           init stage.
>         d.The driver works in two modes:
>           (1) single stage timeout (ignore WS0 interrupt)
>           (2) two stages timeout (register WS0 interrupt, do panic in routine)
>         e.User can config working mode by module parameter "action".
> 
> This patchset has been tested with watchdog daemon
> (ACPI/FDT, module/build-in) on the following platforms:
>     (1)ARM Foundation v8 model
>     (2)AMD Seattle platform
> 
> This patchset has been tested with kdump successfully.
> 
> Changelog:
> v14:Fix a bug of registering interrupt routine: do a ping before
>     registering interrupt routine, in case where is a pending interrupt.
>     Reorder the initialization code to postpone registering interrupt routine.
>     Improve some code style:
>         (1)add some macro of string
>         (2)use watchdog_get_drvdata instead of to_sbsa_gwdt,
>            delete to_sbsa_gwdt.
> 
> v13:https://lkml.org/lkml/2016/2/16/713
>     Fix a dev_warn message typo"signle"-->"single"
>     Add MODULE_ALIAS
>     Add more *ed-by in commit message.
> 
> v12:https://lkml.org/lkml/2016/2/16/154
>     Fix a dev_warn message typo"fall"--"falling"
>     Remove unnecessary "status" in dts
>     Add more *ed-by in commit message.
> 
> v11:https://lkml.org/lkml/2016/2/9/577
>     Merge patch 4 and 5.
>     Improve some comments.
>     The driver works in two modes, it's configured by "action"(instead of
>     panic_enabled).
>     Improve the initialization of the timeout limits.
>     Feeding dog by writing "0" to WRR.
> 
> v10:https://lkml.org/lkml/2016/2/3/817
>     Delete pretimeout support.
>     Separate the driver to two parts:
>         (1) single stage timeout driver(ignore WS0 interrupt);
>         (2) register WS0 interrupt for the half timeout panic.
>     timeout == (enable --> WS1).
> 
> v9: https://lkml.org/lkml/2015/11/9/57
>     Rebase to latest kernel version(4.3).
>     Update the Documentation of sbsa-gwdt device node info of FDT:
>         (1) move some introduction to pretimeout patch
>         (2) delete WS1 value from "interrupts" of binding documentation,
>             since WS1 won't be handled by Linux.
> 
> v8: https://lkml.org/lkml/2015/10/27/466
>     Rebase to latest kernel version(4.3-rc7).
>     Separate the patches of GTDT support and arm_arch_timer. This
>     clocksource relevant patch will upstreamed in a individual patchset.
>     Update all the default timeout and pretimeout to 30s and 60s.
>     Improve documentation and inline comments.
>     Fix a bug in pretimeout support which makes timeout and pretimeout
>     parameters initialization fail.
> 
> v7: https://lkml.org/lkml/2015/8/24/611
>     Rebase to latest kernel version(4.2-rc7).
>     Improve FDT support: geting resource by order, instead of name.
>     According to the FDT support, Update the example dts file, gtdt.c
>     and sbsa_gwdt.c.
>     Pass the sparse test, and fix the warning.
>     Fix the max_pretimeout and max_timeout value overflow bug.
>     Delete the WCV output value.
>     
> 
> v6: https://lkml.org/lkml/2015/6/23/359
>     Improve the dtb example files: reduce the register frame size to 4K.
>     Improve pretimeout support:
>         (1) improve watchdog_init_timeouts function
> 	(2) rename watchdog_check_min_max_timeouts back to the original name
>         (1) improve watchdog_timeout_invalid/watchdog_pretimeout_invalid
>     Add the new features in the sbsa_gwdt driver:
> 	(1) In the second stage, user can feed the dog without cleaning WS0.
> 	(2) In the second stage, user can trigger WS1 by setting pretimeout = 0.
> 	(3) expand the max value of pretimeout, in case 10 second is not enough
> 	    for a kdump kernel reboot in panic.
> 
> v5: https://lkml.org/lkml/2015/6/10/357
>     Improve pretimeout support:
>         (1)fix typo in documentation and comments.
> 	(2)fix the timeout limits validation bug.
>     Simplify sbsa_gwdt driver:
> 	(1)integrate all the registers access functions into caller.
> 
> v4: https://lkml.org/lkml/2015/6/2/4
>     Refactor GTDT support code: remove it from arch/arm64/kernel/acpi.c,
>     put it into drivers/acpi/gtdt.c file.
>     Integrate the GTDT code of drivers/clocksource/arm_arch_timer.c into
>     drivers/acpi/gtdt.c.
>     Improve pretimeout support, fix "pretimeout == 0" problem.
>     Simplify sbsa_gwdt driver:
>         (1)timeout/pretimeout limits setup;
>         (2)keepalive function;
>         (3)delete "clk == 0" check;
>         (4)delete WS0 status bit check in interrupt routine;
>         (5)sbsa_gwdt_set_wcv function.
> 
> v3: https://lkml.org/lkml/2015/5/25/111
>     Delete "export arch_timer_get_rate" patch.
>     Driver back to use arch_timer_get_cntfrq.
>     Improve watchdog_init_timeouts function and update relevant documentation.
>     Improve watchdog_timeout_invalid and watchdog_pretimeout_invalid.
>     Improve foundation-v8.dts: delete the unnecessary tag of device node.
>     Remove "ARM64 || COMPILE_TEST" from Kconfig.
>     Add comments in arch/arm64/kernel/acpi.c
>     Fix typoes and incorrect comments.
> 
> v2: https://lkml.org/lkml/2015/5/21/172
>     Improve watchdog-kernel-api.txt documentation for pretimeout support.
>     Export "arch_timer_get_rate" in arm_arch_timer.c.
>     Add watchdog_init_timeouts API for pretimeout support in framework.
>     Improve suspend and resume foundation in driver
>     Improve timeout/pretimeout values init code in driver.
>     Delete unnecessary items of the sbsa_gwdt struct and #define.
>     Delete all unnecessary debug info in driver.
>     Fix 64bit division bug.
>     Use the arch_timer interface to get watchdog clock rate.
>     Add MODULE_DEVICE_TABLE for platform device id.
>     Fix typoes.
> 
> v1: https://lkml.org/lkml/2015/5/15/279
>     The first version upstream patchset to linux mailing list.
> 
> Fu Wei (4):
>   Documentation: add sbsa-gwdt driver documentation
>   ARM64: add SBSA Generic Watchdog device node in foundation-v8.dts
>   ARM64: add SBSA Generic Watchdog device node in amd-seattle-soc.dtsi
>   Watchdog: introduce ARM SBSA watchdog driver
> 
>  .../devicetree/bindings/watchdog/sbsa-gwdt.txt     |  31 ++
>  Documentation/watchdog/watchdog-parameters.txt     |   7 +
>  arch/arm64/boot/dts/amd/amd-seattle-soc.dtsi       |   8 +
>  arch/arm64/boot/dts/arm/foundation-v8.dts          |   7 +
>  drivers/watchdog/Kconfig                           |  20 +
>  drivers/watchdog/Makefile                          |   1 +
>  drivers/watchdog/sbsa_gwdt.c                       | 408 +++++++++++++++++++++
>  7 files changed, 482 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
>  create mode 100644 drivers/watchdog/sbsa_gwdt.c
> 
> -- 
> 2.5.0
> 

Patchset added to linux-watchdog-next.

Kind regards,
Wim.