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

From: Rob Herring
Date: Mon May 08 2017 - 09:27:34 EST


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@xxxxxxxxxxxxxxxxxxxx>
> ---
> 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 +

Please add acks when posting new versions. I acked v2.

> 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