watchdog: Add pm8916 watchdog driver

The PM816 module is a versatile PMIC with many diverse functions
integrated, including, a watchdog.
This watchdog is subcomponent of the PON (Power On) peripheral,
in the same way as pwrkey/resin buttons.
It works with two timers (2-stages), the first one generates an
IRQ to the main SoC (APQ8016/MSM8916), the second one performs
the reset.

This driver expects the following device hierarchy:
[pm8916]->[pm8916-pon]->[pm8916-wdt]

It uses the pm8916 regmap to access PM8916 registers.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 746759ec8960..6dcd5603a3e4 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -847,6 +847,14 @@ config SPRD_WATCHDOG
           Say Y here to include watchdog timer supported
           by Spreadtrum system.
 
+config PM8916_WATCHDOG
+        tristate "QCOM PM8916 pmic watchdog"
+        depends on OF && MFD_SPMI_PMIC
+        select WATCHDOG_CORE
+        help
+          Say Y here to include support watchdog timer embedded into the
+          pm8916 module.
+
 # X86 (i386 + ia64 + x86_64) Architecture
 
 config ACQUIRE_WDT