Hi Arvind, On Mon, 12 Dec 2016 21:33:05 +0530 arvind Yadav <[email protected]> wrote:
> There is problem, if you will use devm_ioremap_resource instead of > devm_ioremap, > than devm_ioremap_resource will call request_mem_region(). > request_mem_region() allows to tell the kernel that this driver is going > to use > this range of I/O addresses, which will prevent other drivers to make an > overlapping call to request_mem_region If other driver want to use same > address > space to access then it will not allow. Means we can not share same > address space > between two driver. The question is, is it required here? In general, allowing 2 different drivers from touching the same iomem region is a bad idea, so, if there's a reason to allow that here, I'd like to know more about it. Thanks, Boris
