ARM: dts: imx6q-bx50v3: configure unused pca953x pins

At power on, pca953x GPIO pins are configured as input and may cause
unexpected interrupts. Configure the unused pins as GPO low to
avoid unexpected interrupts.

Signed-off-by: Ken Lin <ken.lin@advantech.com.tw>
Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

3 files changed, 95 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/imx6q-b450v3.dts b/arch/arm/boot/dts/imx6q-b450v3.dts
index f0a2be5268e3..78bfc1a307d6 100644
--- a/arch/arm/boot/dts/imx6q-b450v3.dts
+++ b/arch/arm/boot/dts/imx6q-b450v3.dts
@@ -89,3 +89,19 @@
                 };
         };
 };
+
+&pca9539 {
+        P04 {
+                gpio-hog;
+                gpios = <4 0>;
+                output-low;
+                line-name = "PCA9539-P04";
+        };
+
+        P05 {
+                gpio-hog;
+                gpios = <5 0>;
+                output-low;
+                line-name = "PCA9539-P05";
+        };
+};
diff --git a/arch/arm/boot/dts/imx6q-b650v3.dts b/arch/arm/boot/dts/imx6q-b650v3.dts
index 33cb71acadcc..d85388725426 100644
--- a/arch/arm/boot/dts/imx6q-b650v3.dts
+++ b/arch/arm/boot/dts/imx6q-b650v3.dts
@@ -89,3 +89,12 @@
                 };
         };
 };
+
+&pca9539 {
+        P05 {
+                gpio-hog;
+                gpios = <5 0>;
+                output-low;
+                line-name = "PCA9539-P05";
+        };
+};
diff --git a/arch/arm/boot/dts/imx6q-bx50v3.dtsi b/arch/arm/boot/dts/imx6q-bx50v3.dtsi
index cf3fd31e3406..e4a415fd899b 100644
--- a/arch/arm/boot/dts/imx6q-bx50v3.dtsi
+++ b/arch/arm/boot/dts/imx6q-bx50v3.dtsi
@@ -183,6 +183,76 @@
                                 interrupt-controller;
                                 interrupt-parent = <&gpio2>;
                                 interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+                                P06 {
+                                        gpio-hog;
+                                        gpios = <6 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P06";
+                                };
+
+                                P07 {
+                                        gpio-hog;
+                                        gpios = <7 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P07";
+                                };
+
+                                P10 {
+                                        gpio-hog;
+                                        gpios = <8 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P10";
+                                };
+
+                                P11 {
+                                        gpio-hog;
+                                        gpios = <9 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P11";
+                                };
+
+                                P12 {
+                                        gpio-hog;
+                                        gpios = <10 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P12";
+                                };
+
+                                P13 {
+                                        gpio-hog;
+                                        gpios = <11 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P13";
+                                };
+
+                                P14 {
+                                        gpio-hog;
+                                        gpios = <12 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P14";
+                                };
+
+                                P15 {
+                                        gpio-hog;
+                                        gpios = <13 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P15";
+                                };
+
+                                P16 {
+                                        gpio-hog;
+                                        gpios = <14 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P16";
+                                };
+
+                                P17 {
+                                        gpio-hog;
+                                        gpios = <15 0>;
+                                        output-low;
+                                        line-name = "PCA9539-P17";
+                                };
                         };
                 };