mfd / platform: cros_ec_debugfs: Expose resume result via debugfs

For ECs that support it, the EC returns the number of slp_s0
transitions and whether or not there was a timeout in the resume
response. Expose the last resume result to usermode via debugfs so
that usermode can detect and report S0ix timeouts.

Signed-off-by: Evan Green <evgreen@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

drivers/platform/chrome/cros_ec_debugfs.c

@@ -447,6 +447,9 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
 	debugfs_create_file("uptime", 0444, debug_info->dir, debug_info,
 			    &cros_ec_uptime_fops);
 
+	debugfs_create_x32("last_resume_result", 0444, debug_info->dir,
+			   &ec->ec_dev->last_resume_result);
+
 	ec->debug_info = debug_info;
 
 	dev_set_drvdata(&pd->dev, ec);