dma: 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/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
index 7d70ad0e3966daedffed26701746388c10a3cf44..d5feb933151eeedd8be2f49901dd9731ee0775a6 100644 (file)
--- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
+++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
@@ -418,7 +418,10 @@
                        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";