--- zzzz-none-000/linux-3.10.107/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt	2021-02-04 17:41:59.000000000 +0000
@@ -6,8 +6,11 @@
 microcontroller to turn the power off. This driver adds a handler to
 pm_power_off which is called to turn the power off.
 
+Synology NAS devices use a similar scheme, but a different baud rate,
+9600, and a different character, '1'.
+
 Required Properties:
-- compatible: Should be "qnap,power-off"
+- compatible: Should be "qnap,power-off" or "synology,power-off"
 
 - reg: Address and length of the register set for UART1
 - clocks: tclk clock