[PATCH 07/14] dt-bindings: pinctrl: stm32: support IO synchronization parameters

[Antonio Borneo]

From: Fabien Dessenne <fabien.dessenne at foss.st.com>

Support the following IO synchronization parameters:
- Delay (in ns)
- Delay path (input / output)
- Clock edge (single / double edge)
- Clock inversion
- Retiming

Signed-off-by: Fabien Dessenne <fabien.dessenne at foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo at foss.st.com>
---
 .../bindings/pinctrl/st,stm32-pinctrl.yaml    | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
index 5d17d6487ae9c..9a7ecfea6eb5b 100644
--- a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
@@ -207,6 +207,54 @@ patternProperties:
               3: High speed
             $ref: /schemas/types.yaml#/definitions/uint32
             enum: [0, 1, 2, 3]
+          st,io-delay-path:
+            description: |
+              IO synchronization delay path location
+              0: Delay switched into the output path
+              1: Delay switched into the input path
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+          st,io-clk-edge:
+            description: |
+              IO synchronization clock edge
+              0: Data single-edge (changing on rising or falling clock edge)
+              1: Data double-edge (changing on both clock edges)
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+          st,io-clk-type:
+            description: |
+              IO synchronization clock inversion
+              0: IO clocks not inverted. Data retimed to rising clock edge
+              1: IO clocks inverted. Data retimed to falling clock edge
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+          st,io-retime:
+            description: |
+              IO synchronization data retime
+              0: Data not synchronized or retimed on clock edges
+              1: Data retimed to either rising or falling clock edge
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+          st,io-delay:
+            description: |
+              IO synchronization delay applied to the input or output path
+              0: No delay
+              1: Delay 0.30 ns
+              2: Delay 0.50 ns
+              3: Delay 0.75 ns
+              4: Delay 1.00 ns
+              5: Delay 1.25 ns
+              6: Delay 1.50 ns
+              7: Delay 1.75 ns
+              8: Delay 2.00 ns
+              9: Delay 2.25 ns
+              10: Delay 2.50 ns
+              11: Delay 2.75 ns
+              12: Delay 3.00 ns
+              13: Delay 3.25 ns
+            $ref: /schemas/types.yaml#/definitions/uint32
+            minimum: 0
+            maximum: 13
 
         required:
           - pinmux
-- 
2.34.1