diff --git a/drivers/pwm/pwm_rpi_pico.c b/drivers/pwm/pwm_rpi_pico.c
index 98fefe1aad630..1e54964a61b6f 100644
--- a/drivers/pwm/pwm_rpi_pico.c
+++ b/drivers/pwm/pwm_rpi_pico.c
@@ -17,8 +17,21 @@ LOG_MODULE_REGISTER(pwm_rpi_pico, CONFIG_PWM_LOG_LEVEL);
 #include <hardware/pwm.h>
 #include <hardware/structs/pwm.h>
 
+/*
+ * pico-sdk defines PWM_NUM_SLICES with a 'u' suffix for unsigned, which
+ * doesn't work with LISTIFY later on in this file.
+ */
+#ifdef CONFIG_SOC_SERIES_RP2350
+#define PWM_RPI_PICO_NUM_SLICES 12
+#else
+#define PWM_RPI_PICO_NUM_SLICES 8
+#endif
+BUILD_ASSERT(NUM_PWM_SLICES == PWM_RPI_PICO_NUM_SLICES,
+			 "PWM_RPI_PICO_NUM_SLICES misconfigured for SOC");
+
 #define PWM_RPI_PICO_COUNTER_TOP_MAX    UINT16_MAX
-#define PWM_RPI_NUM_CHANNELS            (16U)
+#define PWM_RPI_NUM_CHANNELS            (2 * NUM_PWM_SLICES)
+
 
 struct pwm_rpi_slice_config {
 	uint8_t integral;
@@ -193,7 +206,7 @@ static int pwm_rpi_init(const struct device *dev)
 	return 0;
 }
 
-#define PWM_INST_RPI_SLICE_DIVIDER(idx, n)				   \
+#define PWM_INST_RPI_SLICE_DIVIDER(n, idx)				   \
 	{								   \
 		.integral = DT_INST_PROP_OR(idx, UTIL_CAT(divider_int_, n), 0),			   \
 		.frac = DT_INST_PROP_OR(idx, UTIL_CAT(divider_frac_, n), 0),			   \
@@ -206,14 +219,7 @@ static int pwm_rpi_init(const struct device *dev)
 		.pwm_controller = (pwm_hw_t *)DT_INST_REG_ADDR(idx),				   \
 		.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx),					   \
 		.slice_configs = {								   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 0),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 1),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 2),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 3),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 4),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 5),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 6),					   \
-			PWM_INST_RPI_SLICE_DIVIDER(idx, 7),					   \
+			LISTIFY(PWM_RPI_PICO_NUM_SLICES, PWM_INST_RPI_SLICE_DIVIDER, (,), idx)	   \
 		},										   \
 		.reset = RESET_DT_SPEC_INST_GET(idx),						   \
 		.clk_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(idx)),				   \
diff --git a/dts/bindings/pwm/raspberrypi,pico-pwm.yaml b/dts/bindings/pwm/raspberrypi,pico-pwm.yaml
index 6e29eb132ee39..98031fa5f5c97 100644
--- a/dts/bindings/pwm/raspberrypi,pico-pwm.yaml
+++ b/dts/bindings/pwm/raspberrypi,pico-pwm.yaml
@@ -87,6 +87,42 @@ properties:
     type: int
     description: See divider-frac-0 for help
 
+  divider-int-8:
+    type: int
+    description: |
+      See divider-int-0 for help, however this PWM slice is not available on
+      RP2040.
+
+  divider-frac-8:
+    type: int
+    description: |
+      See divider-frac-0 for help, however this PWM slice is not available on
+      RP2040.
+
+  divider-int-9:
+    type: int
+    description: See divider-int-8 for help
+
+  divider-frac-9:
+    type: int
+    description: See divider-frac-8 for help
+
+  divider-int-10:
+    type: int
+    description: See divider-int-8 for help
+
+  divider-frac-10:
+    type: int
+    description: See divider-frac-8 for help
+
+  divider-int-11:
+    type: int
+    description: See divider-int-8 for help
+
+  divider-frac-11:
+    type: int
+    description: See divider-frac-8 for help
+
   "#pwm-cells":
     const: 3
 
diff --git a/include/zephyr/dt-bindings/pinctrl/rpi-pico-pinctrl-common.h b/include/zephyr/dt-bindings/pinctrl/rpi-pico-pinctrl-common.h
index a1b396d1dd60a..0f575a8d8f556 100644
--- a/include/zephyr/dt-bindings/pinctrl/rpi-pico-pinctrl-common.h
+++ b/include/zephyr/dt-bindings/pinctrl/rpi-pico-pinctrl-common.h
@@ -12,7 +12,7 @@
 #define RP2_ALT_FUNC_MASK 0xf
 
 #define RP2_PIN_NUM_POS  5
-#define RP2_PIN_NUM_MASK 0x1f
+#define RP2_PIN_NUM_MASK 0x3f
 
 #define RP2_GPIO_OVERRIDE_NORMAL 0
 #define RP2_GPIO_OVERRIDE_INVERT 1
diff --git a/include/zephyr/dt-bindings/pinctrl/rpi-pico-rp2350b-pinctrl.h b/include/zephyr/dt-bindings/pinctrl/rpi-pico-rp2350b-pinctrl.h
index 7f53cf559fd62..d4e5e436c22ef 100644
--- a/include/zephyr/dt-bindings/pinctrl/rpi-pico-rp2350b-pinctrl.h
+++ b/include/zephyr/dt-bindings/pinctrl/rpi-pico-rp2350b-pinctrl.h
@@ -79,14 +79,14 @@
 #define PWM_10B_P37 RP2XXX_PINMUX(37, RP2_PINCTRL_GPIO_FUNC_PWM)
 #define PWM_11A_P38 RP2XXX_PINMUX(38, RP2_PINCTRL_GPIO_FUNC_PWM)
 #define PWM_11B_P39 RP2XXX_PINMUX(39, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_12A_P40 RP2XXX_PINMUX(40, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_12B_P41 RP2XXX_PINMUX(41, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_13A_P42 RP2XXX_PINMUX(42, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_13B_P43 RP2XXX_PINMUX(43, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_14A_P44 RP2XXX_PINMUX(44, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_14B_P45 RP2XXX_PINMUX(45, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_15A_P46 RP2XXX_PINMUX(46, RP2_PINCTRL_GPIO_FUNC_PWM)
-#define PWM_15B_P47 RP2XXX_PINMUX(47, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_8A_P40 RP2XXX_PINMUX(40, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_8B_P41 RP2XXX_PINMUX(41, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_9A_P42 RP2XXX_PINMUX(42, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_9B_P43 RP2XXX_PINMUX(43, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_10A_P44 RP2XXX_PINMUX(44, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_10B_P45 RP2XXX_PINMUX(45, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_11A_P46 RP2XXX_PINMUX(46, RP2_PINCTRL_GPIO_FUNC_PWM)
+#define PWM_11B_P47 RP2XXX_PINMUX(47, RP2_PINCTRL_GPIO_FUNC_PWM)
 
 #define PIO0_P30 RP2XXX_PINMUX(30, RP2_PINCTRL_GPIO_FUNC_PIO0)
 #define PIO0_P31 RP2XXX_PINMUX(31, RP2_PINCTRL_GPIO_FUNC_PIO0)
diff --git a/soc/raspberrypi/rpi_pico/common/pinctrl_soc.h b/soc/raspberrypi/rpi_pico/common/pinctrl_soc.h
index 35a7d3aee8c5e..82a55cd84db0b 100644
--- a/soc/raspberrypi/rpi_pico/common/pinctrl_soc.h
+++ b/soc/raspberrypi/rpi_pico/common/pinctrl_soc.h
@@ -13,8 +13,8 @@
  * @brief Type to hold a pin's pinctrl configuration.
  */
 struct rpi_pinctrl_soc_pin {
-	/** Pin number 0..29 */
-	uint32_t pin_num: 5;
+	/** Pin number 0..29 on RP2040, 0..47 on RP2350 */
+	uint32_t pin_num: 6;
 	/** Alternative function (UART, SPI, etc.) */
 	uint32_t alt_func: 5;
 	/** Maximum current used by a pin, in mA */