On 05/11/2017 12:22 AM, Shawn Guo wrote:
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 +
The dts change shouldn't be mixed within driver patch.
Maybe, but Rob Acked the devicetree changes, so I don't see a reason
for splitting it up now.
Guenter
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
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