[PATCH v3 6/6] watchdog: ts4600: add driver for TS-4600 watchdog

[Shawn Guo]

On Fri, May 05, 2017 at 03:32:59PM -0400, Sebastien Bourdelin wrote:
> This watchdog is instantiated in a FPGA and can only be access using a
> GPIOs bit-banged bus, called the NBUS by Technologic Systems.
> The watchdog is made of only one register, called the feed register.
> Writing to this register will re-arm the watchdog for a given time (and
> enable it if it was disable). It can be disabled by writing a special
> value into it.
> 
> Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin at savoirfairelinux.com>
> ---
> Changes v2 -> v3:
>   - rebase on master
>   - remove the timeout table to simplify the logic (suggested by
>   Guenter Roeck)
>   - fix the set_timeout function (suggested by Guenter Roeck)
>   - hardcode the max_hw_heartbeat_ms value based on the ts4600 max
>   timeout value supported (suggested by Guenter Roeck)
>   - remove the max_timeout usage and set a default timeout value
> (suggested by Guenter Roeck)
>   - use the devm_watchdog_register_device function instead of
>   watchdog_register_device (suggested by Guenter Roeck)
> 
> Changes v1 -> v2:
>   - rebase on master
>   - retrieve the ts_nbus instantiated by the parent node (suggested by
>   Linus Walleij)
>   - rename the wdt by watchdog in the device tree and in the
>   documentation (suggested by Rob Herring)
>   - add a dependency to the TS_NBUS driver in the Kconfig (suggested by
>   Guenter Roeck)
>   - simplify the set_timeout function (suggested by Guenter Roeck)
>   - use the max_hw_heartbeat_ms callback instead of the max_timeout
>   callback (suggested by Guenter Roeck)
> ---
>  .../devicetree/bindings/watchdog/ts4600-wdt.txt    |  16 ++
>  arch/arm/boot/dts/imx28-ts4600-common.dtsi         |   5 +

The dts change shouldn't be mixed within driver patch.

Shawn

>  drivers/watchdog/Kconfig                           |  11 ++
>  drivers/watchdog/Makefile                          |   1 +
>  drivers/watchdog/ts4600_wdt.c                      | 185 +++++++++++++++++++++
>  5 files changed, 218 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/ts4600-wdt.txt
>  create mode 100644 drivers/watchdog/ts4600_wdt.c