The option for the ast2400/2500 to get access to CS0 at runtime.
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@xxxxxxxxx>
---
Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
index c5077a1f5cb3..023a9b578df6 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -34,6 +34,13 @@ Optional properties:
engine is responsible for this.
- aspeed,alt-boot: If property is present then boot from alternate block.
+ At alternate side 'access_cs0' sysfs file provides:
+ ast2400: a way to get access to the primary SPI flash
+ chip at CS0 after booting from the alternate
+ chip at CS1.
+ ast2500: a way to restore the normal address mapping from
+ (CS0->CS1, CS1->CS0) to (CS0->CS0, CS1->CS1).
+
- aspeed,external-signal: If property is present then signal is sent to
external reset counter (only WDT1 and WDT2). If not
specified no external signal is sent.
--
2.20.1
