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: Sai Pavan Boddu <saipava@xilinx.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index f67238e89725b73d1cc7e4d982cb178a44970356..aeeccbf9e9d0a0c306f018f9508934eba20dc1bf 100644 (file)
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -421,7 +421,10 @@
                        power-domains = <&pd_gpu>;
                };
 
-               /* ADMA */
+               /* LPDDMA default allows only secured access. inorder to enable
+                * These dma channels, Users should ensure that these dma
+                * Channels are allowed for non secure access.
+                */
                lpd_dma_chan1: dma@ffa80000 {
                        status = "disabled";
                        compatible = "xlnx,zynqmp-dma-1.0";