On Fri, Jun 5, 2020 at 12:14 AM Michael Walle [off-list ref] wrote:

Add support for the watchdog of the sl28cpld board management
controller. This is part of a multi-function device driver.

...

+#include <linux/of_device.h>

Didn't find a user of this.

...

+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+                               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int timeout;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");

Guenter ACKed this, but I'm wondering why we still need module parameters...

...

+       int ret;
+
+       ret = regmap_read(wdt->regmap, wdt->offset + WDT_COUNT, &val);
+
+       return (ret < 0) ? 0 : val;

Besides extra parentheses and questionable ' < 0' part, the following
would look better I think

ret = ...
if (ret)
  return 0;

return val;

...

+       int ret;
+
+       ret = regmap_write(wdt->regmap, wdt->offset + WDT_TIMEOUT, timeout);
+       if (!ret)
+               wdd->timeout = timeout;
+
+       return ret;

Similar story here:

ret = ...
if (ret)
  return ret;

wdd->... = ...
return 0;

...

+       ret = regmap_read(wdt->regmap, wdt->offset + WDT_CTRL, &status);

+       if (ret < 0)

What ' < 0' means? Do we have some positive return values?
Ditto for all your code.

+               return ret;

...

+       if (status & WDT_CTRL_EN) {
+               sl28cpld_wdt_start(wdd);

+               set_bit(WDOG_HW_RUNNING, &wdd->status);

Do you need atomic op here? Why?

+       }

...

+static const struct of_device_id sl28cpld_wdt_of_match[] = {
+       { .compatible = "kontron,sl28cpld-wdt" },

+       {},

No comma.

+};

-- 
With Best Regards,
Andy Shevchenko

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