[..snip...]

quoted

+		if (info->buf_len & (info->buf_len < bytes))

Meant to use logical AND here?

[Ghorai] thanks, you are right.

[..snip..]

quoted

+	init_completion(&info->comp);

You can use INIT_COMPLETION to reset the completion variable.
Same change can be done in write below.

[..snip..]

s/methode/method

[Ghorai] yes. I will do this 

[..snip..]

quoted

+	/* waiting for write to complete */
+	wait_for_completion(&info->comp);
+	/* wait for data to flushed-out before reset the prefetch */
+	do {
+		ret = gpmc_read_status(GPMC_PREFETCH_COUNT);
+	} while (ret);

Please have a timeout for this while loop in case hardware does
not become ready. Also, consider using cpu_relax() inside the
tight loop.

[Ghorai] Thanks. I will send again.