ARM64: zynqmp: Add description for LPDDMA channel usage
LPDDMA default allows only secured access. inorder to enable these dma channels, one should ensure that it allows non secure access. This patch updates the same. Reported-by: NSai Pavan Boddu <saipava@xilinx.com> Signed-off-by: NKedareswara rao Appana <appanad@xilinx.com> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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