arm64: dts: apq8016-sbc: Limit MPP4 high state to 1.8V

96Boards specs require all GPIO signals to be at 1.8V.
Limit MPP4, which is PIN28 on J8, to 1.8V(L5).

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc-pmic-pins.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc-pmic-pins.dtsi
index f881437..d946408 100644 (file)
--- a/arch/arm64/boot/dts/qcom/apq8016-sbc-pmic-pins.dtsi
+++ b/arch/arm64/boot/dts/qcom/apq8016-sbc-pmic-pins.dtsi
@@ -1,4 +1,5 @@
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
+#include <dt-bindings/pinctrl/qcom,pmic-mpp.h>
 
 &pm8916_gpios {
 
@@ -30,6 +31,18 @@
 
 &pm8916_mpps {
 
+       pinctrl-names = "default";
+       pinctrl-0 = <&ls_exp_gpio_f>;
+
+       ls_exp_gpio_f: pm8916_mpp4 {
+               pinconf {
+                       pins = "mpp4";
+                       function = "digital";
+                       output-low;
+                       power-source = <PM8916_MPP_L5>; // 1.8V
+               };
+       };
+
        pm8916_mpps_leds: pm8916_mpps_leds {
                pinconf {
                        pins = "mpp2", "mpp3";