unmap memory mapped with devm_ioremap_resource

Hello, I am extending xilinx-hls driver (https://github.com/Xilinx/linux-xlnx/blob/master/drivers/media/platform/xili...) to support of_overlay. In order to reflect in the driver changes being applied by the overlay to the device tree, I need to unmap first the memory mapped with devm_ioremap_resource. How to do it properly? I think it's uncommon, as normally kernel (devm_* functions) manages those resources itself with devres, so I can't find inspiration in other drivers. Regards, Adrian