boards: st: nucleo_wb09ke: Optimize power consumption

Optimize power consumption for the Nucleo-WB09KE board by
implementing correct pull-up/pull-down configurations when the device
enters lower power states.

Disable the SMPS with floating output in suspend-to-ram (deepstop)
power state.

Signed-off-by: Ali Hozhabri <[email protected]>

Author: HoZHel

boards/st/nucleo_wb09ke/nucleo_wb09ke.dts

@@ -90,6 +90,7 @@
 &pwrc {
 	smps-mode = "RUN";
 	smps-bom = <3>;
+	smps-lp-floating;
 };
 
 &clk_lse {
@@ -129,6 +130,37 @@
 	status = "okay";
 };
 
+/* Optimize power consumption during lower power state */
+&gpioa {
+	gpios-pull-up {
+		gpio-hog;
+		gpios = <0 GPIO_PULL_UP>;
+		input;
+	};
+
+	gpios-pull-down {
+		gpio-hog;
+		gpios = <8 GPIO_PULL_DOWN>, <9 GPIO_PULL_DOWN>,
+			<10 GPIO_PULL_DOWN>, <11 GPIO_PULL_DOWN>;
+		input;
+	};
+};
+
+&gpiob {
+	gpios-pull-up {
+		gpio-hog;
+		gpios = <1 GPIO_PULL_UP>, <2 GPIO_PULL_UP>, <4 GPIO_PULL_UP>,
+			<5 GPIO_PULL_UP>, <14 GPIO_PULL_UP>, <15 GPIO_PULL_UP>;
+		input;
+	};
+
+	gpios-pull-down {
+		gpio-hog;
+		gpios = <3 GPIO_PULL_DOWN>, <6 GPIO_PULL_DOWN>, <7 GPIO_PULL_DOWN>;
+		input;
+	};
+};
+
 &bt_hci_wb0 {
 	status = "okay";
 };