pinctrl: qcom: Add generic ssbi and spmi GPIO/MPP bindings

The drivers don't really need to know which PMIC they're for, so
make a generic binding for them. This alleviates us from updating
the drivers every time a new PMIC comes out. It's still
recommended that we update the binding with new PMIC models and
always specify the specific model for the MPPs and gpios before
the generic compatible string in devicetree, but this at least
cuts down on adding more and more compatible strings to the
drivers until we actually need them.

Cc: <devicetree@vger.kernel.org>
Acked-by: "Ivan T. Ivanov" <iivanov.xz@gmail.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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

@@ -17,6 +17,9 @@ PMIC's from Qualcomm.
 		    "qcom,pm8994-gpio"
 		    "qcom,pma8084-gpio"
 
+		    And must contain either "qcom,spmi-gpio" or "qcom,ssbi-gpio"
+		    if the device is on an spmi bus or an ssbi bus respectively
+
 - reg:
 	Usage: required
 	Value type: <prop-encoded-array>
@@ -183,7 +186,7 @@ to specify in a pin configuration subnode:
 Example:
 
 	pm8921_gpio: gpio@150 {
-		compatible = "qcom,pm8921-gpio";
+		compatible = "qcom,pm8921-gpio", "qcom,ssbi-gpio";
 		reg = <0x150 0x160>;
 		interrupts = <192 1>, <193 1>, <194 1>,
 			     <195 1>, <196 1>, <197 1>,

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

@@ -19,6 +19,9 @@ of PMIC's from Qualcomm.
 		    "qcom,pm8994-mpp",
 		    "qcom,pma8084-mpp",
 
+		    And must contain either "qcom,spmi-mpp" or "qcom,ssbi-mpp"
+		    if the device is on an spmi bus or an ssbi bus respectively.
+
 - reg:
 	Usage: required
 	Value type: <prop-encoded-array>
@@ -158,7 +161,7 @@ to specify in a pin configuration subnode:
 Example:
 
 	mpps@a000 {
-		compatible = "qcom,pm8841-mpp";
+		compatible = "qcom,pm8841-mpp", "qcom,spmi-mpp";
 		reg = <0xa000>;
 		gpio-controller;
 		#gpio-cells = <2>;

drivers/pinctrl/qcom/pinctrl-spmi-gpio.c

@@ -800,6 +800,7 @@ static const struct of_device_id pmic_gpio_of_match[] = {
 	{ .compatible = "qcom,pm8941-gpio" },	/* 36 GPIO's */
 	{ .compatible = "qcom,pm8994-gpio" },	/* 22 GPIO's */
 	{ .compatible = "qcom,pma8084-gpio" },	/* 22 GPIO's */
+	{ .compatible = "qcom,spmi-gpio" }, /* Generic */
 	{ },
 };
 

drivers/pinctrl/qcom/pinctrl-spmi-mpp.c

@@ -914,6 +914,7 @@ static const struct of_device_id pmic_mpp_of_match[] = {
 	{ .compatible = "qcom,pm8941-mpp" },	/* 8 MPP's */
 	{ .compatible = "qcom,pm8994-mpp" },	/* 8 MPP's */
 	{ .compatible = "qcom,pma8084-mpp" },	/* 8 MPP's */
+	{ .compatible = "qcom,spmi-mpp" },	/* Generic */
 	{ },
 };