dt-bindings: pinctrl: renesas: Document RZ/G3S SoC

Add documentation for the pin controller found on the Renesas RZ/G3S
(R9A08G045) SoC.  Compared to RZ/G2{L,UL}, RZ/G3S has 82 general-purpose
IOs, no slew rate and output impedance support, and more values for
drive strength which needs to be expressed in microamp.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230929053915.1530607-21-claudiu.beznea@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml

@@ -25,6 +25,7 @@ properties:
           - enum:
               - renesas,r9a07g043-pinctrl # RZ/G2UL{Type-1,Type-2} and RZ/Five
               - renesas,r9a07g044-pinctrl # RZ/G2{L,LC}
+              - renesas,r9a08g045-pinctrl # RZ/G3S
 
       - items:
           - enum:
@@ -77,6 +78,21 @@ additionalProperties:
         - $ref: pincfg-node.yaml#
         - $ref: pinmux-node.yaml#
 
+        - if:
+            properties:
+              compatible:
+                contains:
+                  enum:
+                    - renesas,r9a08g045-pinctrl
+          then:
+            properties:
+              drive-strength: false
+              output-impedance-ohms: false
+              slew-rate: false
+          else:
+            properties:
+              drive-strength-microamp: false
+
       description:
         Pin controller client devices use pin configuration subnodes (children
         and grandchildren) for desired pin configuration.
@@ -91,6 +107,10 @@ additionalProperties:
         pins: true
         drive-strength:
           enum: [ 2, 4, 8, 12 ]
+        drive-strength-microamp:
+          enum: [ 1900, 2200, 4000, 4400, 4500, 4700, 5200, 5300, 5700,
+                  5800, 6000, 6050, 6100, 6550, 6800, 7000, 8000, 9000,
+                  10000 ]
         output-impedance-ohms:
           enum: [ 33, 50, 66, 100 ]
         power-source: