sgpio-aspeed bindings should be converted to yaml format.

Signed-off-by: Steven Lee <redacted>
---
 .../bindings/gpio/aspeed,sgpio.yaml           | 75 +++++++++++++++++++
 .../devicetree/bindings/gpio/sgpio-aspeed.txt | 46 ------------
 2 files changed, 75 insertions(+), 46 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
 delete mode 100644 Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt

diff --git a/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml 

b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
new file mode 100644
index 000000000000..b2ae211411ff

--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml

@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/aspeed,sgpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aspeed SGPIO controller
+
+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
+  - 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
+  - Directly connected to APB bus and its shift clock is from APB bus 
clock
+    divided by a programmable value.
+  - Co-work with external signal-chained TTL components 
(74LV165/74LV595)
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2400-sgpio
+      - aspeed,ast2500-sgpio
+
+  reg:
+    maxItems: 1
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    const: 2
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  clocks:
+    maxItems: 1
+
+  ngpios: true
+
+  bus-frequency: true