diff --git a/arch/sandbox/dts/sandbox.dtsi b/arch/sandbox/dts/sandbox.dtsi
index c93ce712894..8a115c503dc 100644
--- a/arch/sandbox/dts/sandbox.dtsi
+++ b/arch/sandbox/dts/sandbox.dtsi
@@ -231,23 +231,25 @@
 	};
 
 	pinctrl {
+		bootph-some-ram;
 		compatible = "sandbox,pinctrl";
 		status = "okay";
 
 		pinctrl_i2c0: i2c0 {
-			groups = "i2c";
-			function = "i2c";
+			groups = "I2C_UART";
+			function = "I2C";
 			bias-pull-up;
 		};
 
 		pinctrl_serial0: uart0 {
-			groups = "serial_a";
-			function = "serial";
+			bootph-some-ram;
+			groups = "I2C_UART";
+			function = "UART";
 		};
 
 		pinctrl_onewire0: onewire0 {
-			groups = "w1";
-			function = "w1";
+			pins = "P8";
+			function = "ONEWIRE";
 			bias-pull-up;
 		};
 	};
diff --git a/drivers/pinctrl/pinctrl-sandbox.c b/drivers/pinctrl/pinctrl-sandbox.c
index a5d056643a0..f6921b56ceb 100644
--- a/drivers/pinctrl/pinctrl-sandbox.c
+++ b/drivers/pinctrl/pinctrl-sandbox.c
@@ -42,7 +42,7 @@ static const char * const sandbox_pins_muxing[][2] = {
 	{ "GPIO0", "SPI CS0" },
 	{ "GPIO1", "SPI CS1" },
 	{ "GPIO2", "PWM0" },
-	{ "GPIO3", "PWM1" },
+	{ "GPIO3", "ONEWIRE" },
 };
 
 #define SANDBOX_GROUP_I2C_UART 0
@@ -63,6 +63,7 @@ static const char * const sandbox_functions[] = {
 	FUNC(GPIO),
 	FUNC(CS),
 	FUNC(PWM),
+	FUNC(ONEWIRE),
 #undef FUNC
 };
 
@@ -166,6 +167,7 @@ static int sandbox_pinmux_set(struct udevice *dev, unsigned pin_selector,
 		break;
 	case SANDBOX_PINMUX_CS:
 	case SANDBOX_PINMUX_PWM:
+	case SANDBOX_PINMUX_ONEWIRE:
 		mux = BIT(pin_selector);
 		break;
 	default:
diff --git a/include/dt-bindings/pinctrl/sandbox-pinmux.h b/include/dt-bindings/pinctrl/sandbox-pinmux.h
index 891af072e52..21c5a1762ab 100644
--- a/include/dt-bindings/pinctrl/sandbox-pinmux.h
+++ b/include/dt-bindings/pinctrl/sandbox-pinmux.h
@@ -13,6 +13,7 @@
 #define SANDBOX_PINMUX_GPIO 4
 #define SANDBOX_PINMUX_CS   5
 #define SANDBOX_PINMUX_PWM  6
+#define SANDBOX_PINMUX_ONEWIRE 7
 
 #define SANDBOX_PINMUX(pin, func) ((func) << 16 | (pin))