dt-bindings: pinctrl: mt7986: add generic bias-pull* support

Since the bias-pull-{up,down} attribute already defines in pinctrl driver
of mediatek MT7986 SoC, this patch updates bindings to support mediatek
common bias-pull* function.
Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221106080114.7426-4-linux@fw-web.deSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7986-pinctrl.yaml

@@ -292,9 +292,23 @@ patternProperties:
 
           bias-disable: true
 
-          bias-pull-up: true
-
-          bias-pull-down: true
+          bias-pull-up:
+            oneOf:
+              - type: boolean
+                description: normal pull up.
+              - enum: [100, 101, 102, 103]
+                description: |
+                  PUPD/R1/R0 pull down type. See MTK_PUPD_SET_R1R0 defines in
+                  dt-bindings/pinctrl/mt65xx.h.
+
+          bias-pull-down:
+            oneOf:
+              - type: boolean
+                description: normal pull down.
+              - enum: [100, 101, 102, 103]
+                description: |
+                  PUPD/R1/R0 pull down type. See MTK_PUPD_SET_R1R0 defines in
+                  dt-bindings/pinctrl/mt65xx.h.
 
           input-enable: true
 
@@ -346,6 +360,7 @@ examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/pinctrl/mt65xx.h>
 
     soc {
       #address-cells = <2>;
@@ -412,5 +427,34 @@ examples:
           };
         };
 
+        mmc0_pins_default: mmc0-pins {
+          mux {
+            function = "emmc";
+            groups = "emmc_51";
+          };
+          conf-cmd-dat {
+            pins = "EMMC_DATA_0", "EMMC_DATA_1", "EMMC_DATA_2",
+                   "EMMC_DATA_3", "EMMC_DATA_4", "EMMC_DATA_5",
+                   "EMMC_DATA_6", "EMMC_DATA_7", "EMMC_CMD";
+            input-enable;
+            drive-strength = <4>;
+            bias-pull-up = <MTK_PUPD_SET_R1R0_01>; /* pull-up 10K */
+          };
+          conf-clk {
+            pins = "EMMC_CK";
+            drive-strength = <6>;
+            bias-pull-down = <MTK_PUPD_SET_R1R0_10>; /* pull-down 50K */
+          };
+          conf-ds {
+            pins = "EMMC_DSL";
+            bias-pull-down = <MTK_PUPD_SET_R1R0_10>; /* pull-down 50K */
+          };
+          conf-rst {
+            pins = "EMMC_RSTB";
+            drive-strength = <4>;
+            bias-pull-up = <MTK_PUPD_SET_R1R0_01>; /* pull-up 10K */
+          };
+        };
+
       };
     };