Re: [Linaro-acpi] [PATCH v2 4/6] Watchdog: introdouce ARM SBSA watchdog driver (1)use linux kernel watchdog framework (2)work with FDT (3)support pretimeout, for now in first timeout(WS0), do panic to save system context.

On 5/4/2015 7:04 AM, fu.wei@linaro.org wrote:

+static int sbsa_gwdt_set_pretimeout(struct watchdog_device *wdd,

• 		     unsigned int pretimeout)
  

+{

• struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
• u32 wor;
• if (watchdog_pretimeout_invalid(gwdt, pretimeout)) {

• pr_err("sbsa_gwdt: pretimeout %d is out of range(0~%d),skip\n",
  

• 	pretimeout, gwdt->max_pretimeout);
  

• return -EINVAL;
  

• }
• gwdt->pretimeout = pretimeout;
• sbsa_gwdt_set_timeout_limits(gwdt);
• /* refresh the WOR, that will cause an explicit watchdog refresh */
• wor = pretimeout * sbsa_gwdt_rate;
• sbsa_gwdt_cf_write(SBSA_GWDT_WOR, wor, wdd);
• return 0;

+}

Fu Wei,

IIUC, isn't the SBSA_GWDT_WOR (offset 8) is the watchdog countdown timer value which is read only?

Suravee