Kernel boot-up issue after applying kernel patch on kernel 5.4

[sagargaikwad-eaton]

After applying kernel patch i.e. 0001-Device-tree-modifications-for-the-logic-analyzer-dem.patch on kernel 5.4 , I am facing kernel boot-up issue and its stuck at rootfs mount logs as below

[ 3.483544] No soundcards found.
[ 3.498375] Freeing unused kernel memory: 3072K
[ 3.523803] Run /init as init process
PX Red initramfs loader
Mounting ext4 filesystem on '/dev/mmcblk0p4'...
Retrying mount of ext4 filesystem on '/dev/mmcblk0p4'...
Retrying mount of ext4 filesystem on '/dev/mmcblk0p4'...
Retrying mount of ext4 filesystem on '/dev/mmcblk0p4'...
Retrying mount of ext4 filesystem on '/dev/mmcblk0p4'...
Retrying mount of ext4 filesystem on '/dev/mmcblk0p4'

After analysis I found in patch

+&dmamux1{

• dma-masters = <&dma1>;
• dma-channels = <8>;
• status = "okay";
• /* USER CODE BEGIN dmamux1 */
• /* USER CODE END dmamux1 */
  +};

This node causing issue and after applying this change there are changes in phandles and pinctrl for various nodes
But after commenting out this (dmamux node) lines from patch I don't see boot-up issue also stm32_rpmsg_sdb.ko got generate

So question : whats is the use of dmamux node here and what's the impact of it after commenting-out it from patch