On Thu, Jun 3, 2021 at 1:20 PM Steven Lee [off-list ref] wrote:

AST SoC supports *retain pin state* function when wdt reset.
The patch adds set_config function for handling sgpio reset tolerance
register.

...

+static int aspeed_sgpio_set_config(struct gpio_chip *chip, unsigned int offset,
+                                  unsigned long config)
+{
+       unsigned long param = pinconf_to_config_param(config);
+       u32 arg = pinconf_to_config_argument(config);
+
+       if (param == PIN_CONFIG_PERSIST_STATE)
+               return aspeed_sgpio_reset_tolerance(chip, offset, arg);

+       else

Redundant.

+               return -EOPNOTSUPP;

IIRC we are using ENOTSUPP internally in the kernel. YEs, checkpatch
warning may be ignored.

+}

-- 
With Best Regards,
Andy Shevchenko