AST2600 SoC has 2 SGPIO master interfaces one with 128 pins another one
with 80 pins. Add ast2600-sgpiom0-80 and ast2600-sgpiom-128 compatibles
and update descriptions to introduce the max number of available gpio
pins that AST2600 supported.

Signed-off-by: Steven Lee <redacted>
Reviewed-by: Andrew Jeffery <redacted>
---
 Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
index b2ae211411ff..0e42eded3c1e 100644
--- a/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml

@@ -10,9 +10,10 @@ maintainers:
   - Andrew Jeffery <andrew@aj.id.au>
 
 description:
-  This SGPIO controller is for ASPEED AST2500 SoC, it supports up to 80 full
-  featured Serial GPIOs. Each of the Serial GPIO pins can be programmed to
-  support the following options
+  This SGPIO controller is for ASPEED AST2400, AST2500 and AST2600 SoC,
+  AST2600 have two sgpio master one with 128 pins another one with 80 pins,
+  AST2500/AST2400 have one sgpio master with 80 pins. Each of the Serial
+  GPIO pins can be programmed to support the following options
   - Support interrupt option for each input port and various interrupt
     sensitivity option (level-high, level-low, edge-high, edge-low)
   - Support reset tolerance option for each output port

@@ -25,6 +26,8 @@ properties:
     enum:
       - aspeed,ast2400-sgpio
       - aspeed,ast2500-sgpio
+      - aspeed,ast2600-sgpiom-80
+      - aspeed,ast2600-sgpiom-128