pinctrl: qcom: spmi-gpio: Add support for GPIO LV/MV subtype

GPIO LV (low voltage)/MV (medium voltage) subtypes have different
features and register mappings than 4CH/8CH subtypes. Add support
for LV and MV subtypes.
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt

@@ -100,7 +100,10 @@ to specify in a pin configuration subnode:
 		    "dtest1",
 		    "dtest2",
 		    "dtest3",
-		    "dtest4"
+		    "dtest4",
+		    And following values are supported by LV/MV GPIO subtypes:
+		    "func3",
+		    "func4"
 
 - bias-disable:
 	Usage: optional
@@ -185,6 +188,18 @@ to specify in a pin configuration subnode:
 	Value type: <none>
 	Definition: The specified pins are configured in open-source mode.
 
+- qcom,analog-pass:
+	Usage: optional
+	Value type: <none>
+	Definition: The specified pins are configured in analog-pass-through mode.
+
+- qcom,atest:
+	Usage: optional
+	Value type: <u32>
+	Definition: Selects ATEST rail to route to GPIO when it's configured
+		    in analog-pass-through mode.
+		    Valid values are 1-4 corresponding to ATEST1 to ATEST4.
+
 Example:
 
 	pm8921_gpio: gpio@150 {

include/dt-bindings/pinctrl/qcom,pmic-gpio.h

@@ -98,6 +98,8 @@
 #define PMIC_GPIO_FUNC_PAIRED		"paired"
 #define PMIC_GPIO_FUNC_FUNC1		"func1"
 #define PMIC_GPIO_FUNC_FUNC2		"func2"
+#define PMIC_GPIO_FUNC_FUNC3		"func3"
+#define PMIC_GPIO_FUNC_FUNC4		"func4"
 #define PMIC_GPIO_FUNC_DTEST1		"dtest1"
 #define PMIC_GPIO_FUNC_DTEST2		"dtest2"
 #define PMIC_GPIO_FUNC_DTEST3		"dtest3"