--- zzzz-none-000/linux-3.10.107/Documentation/devicetree/bindings/mfd/cros-ec.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/devicetree/bindings/mfd/cros-ec.txt	2021-02-04 17:41:59.000000000 +0000
@@ -4,7 +4,7 @@
 implements various function such as keyboard and battery charging.
 
 The EC can be connect through various means (I2C, SPI, LPC) and the
-compatible string used depends on the inteface. Each connection method has
+compatible string used depends on the interface. Each connection method has
 its own driver which connects to the top level interface-agnostic EC driver.
 Other Linux driver (such as cros-ec-keyb for the matrix keyboard) connect to
 the top-level driver.
@@ -17,10 +17,27 @@
 - compatible: "google,cros-ec-spi"
 - reg: SPI chip select
 
+Optional properties (SPI):
+- google,cros-ec-spi-pre-delay: Some implementations of the EC need a little
+  time to wake up from sleep before they can receive SPI transfers at a high
+  clock rate. This property specifies the delay, in usecs, between the
+  assertion of the CS to the start of the first clock pulse.
+- google,cros-ec-spi-msg-delay: Some implementations of the EC require some
+  additional processing time in order to accept new transactions. If the delay
+  between transactions is not long enough the EC may not be able to respond
+  properly to subsequent transactions and cause them to hang. This property
+  specifies the delay, in usecs, introduced between transactions to account
+  for the time required by the EC to get back into a state in which new data
+  can be accepted.
+
 Required properties (LPC):
 - compatible: "google,cros-ec-lpc"
 - reg: List of (IO address, size) pairs defining the interface uses
 
+Optional properties (all):
+- google,has-vbc-nvram: Some implementations of the EC include a small
+  nvram space used to store verified boot context data. This boolean flag
+  is used to specify whether this nvram is present or not.
 
 Example for I2C: