watchdog with multiple channels fails on nrf52 using zephyr (ncs v1.2.0)

Question

Hi, 
 
 I'm using Zephyr with nrf52 and want to setup watchdog support with multiple channels (different timer settings for separate different threads). 
 
 I can add 1 channel, but adding two, get's me a fail, error. 
 This should not happen on the 52, it has support for at least 8 channels I see in the wdt spec for the chip. 
 I get error when creating the 2nd channel. 
 
 Code looks like this: 
 
 #define PERIPH_WATCHDOG_TIMEOUT_MS (30 * 1000U)
#define NETWORK_QUEUE_WATCHDOG_TIMEOUT_MS (10 * 1000U)

int watchdog_init()
{
 int error_code = 0;

 LOG_INF("Watchdog starting");

 wdt = device_get_binding(WDT_DEV_NAME);
 if (!wdt)
 {
 LOG_ERR("Cannot get WDT device
");
 return -ENXIO;
 }
 return error_code;
}

int watchdog_add_channel_timeout(u32_t timeout_ms)
{
 /* Reset SoC when watchdog timer expires. */
 struct wdt_timeout_cfg wdt_config;
 wdt_config.flags = WDT_FLAG_RESET_SOC;

 /* Expire watchdog after 30*1000 milliseconds. */
 wdt_config.window.min = 0U;
 wdt_config.window.max = timeout_ms; // 30 * 1000U;

 /* Set up watchdog callback. Jump into it when watchdog expired. */
 wdt_config.callback = wdt_callback;

 int wdt_channel_id = wdt_install_timeout(wdt, &wdt_config);
 if (wdt_channel_id == -ENOTSUP)
 {
 wdt_config.callback = NULL;
 wdt_channel_id = wdt_install_timeout(wdt, &wdt_config);
 }

 if (wdt_channel_id < 0)
 {
 LOG_ERR("Watchdog install error");
 return -ENXIO;
 }

 return wdt_channel_id;
}

int watchdog_start()
{
 int error_code = wdt_setup(wdt, 0);
 if (error_code < 0)
 {
 LOG_ERR("Watchdog setup error");
 return error_code;
 }

 return error_code;
}


From main I setup like this:

main()
{
...
 int error_code = watchdog_init();
 if (error_code < 0)
 {
 LOG_ERR("Failed to init watchdog");
 }

 // install periph watchdog channel
 int periph_channel_id = -1;
 periph_channel_id = watchdog_add_channel_timeout(PERIPH_WATCHDOG_TIMEOUT_MS);
 if (periph_channel_id < 0)
 {
 LOG_ERR("Failed to setup periph watchdog timer");
 }

 // install network_queue watchdog channel
 int network_queue_channel_id = -1;
 network_queue_channel_id = watchdog_add_channel_timeout(NETWORK_QUEUE_WATCHDOG_TIMEOUT_MS);
 if (network_queue_channel_id < 0)
 {
 LOG_ERR("Failed to setup network_queue watchdog timer");
 }

 // Finally start the watchdog timer
 watchdog_start();

...

}