drivers: pinctrl: update lpc pinctrl driver for lpc11u6x

Update pin control driver for lpc11u6x. This SOC does not have a HAL,
so fsl_clock is not available. It also lacks a slew-rate field in the
IOCON register, so this property must be optional.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

drivers/pinctrl/Kconfig.lpc_iocon

@@ -2,12 +2,14 @@
 # SPDX-License-Identifier: Apache-2.0
 
 DT_COMPAT_NXP_LPC_PINCTRL := nxp,lpc-iocon-pinctrl
+DT_COMPAT_NXP_LPC_11U6X_PINCTRL := nxp,lpc11u6x-pinctrl
 DT_COMPAT_NXP_RT_PINCTRL := nxp,rt-iocon-pinctrl
 
 config PINCTRL_NXP_IOCON
 	bool "IOCON Pin controller driver for NXP LPC MCUs"
 	depends on SOC_FAMILY_LPC || SOC_SERIES_IMX_RT6XX || SOC_SERIES_IMX_RT5XX
 	default $(dt_compat_enabled,$(DT_COMPAT_NXP_LPC_PINCTRL)) || \
-		$(dt_compat_enabled,$(DT_COMPAT_NXP_RT_PINCTRL))
+		$(dt_compat_enabled,$(DT_COMPAT_NXP_RT_PINCTRL)) || \
+		$(dt_compat_enabled,$(DT_COMPAT_NXP_LPC_11U6X_PINCTRL))
 	help
 	  Enable pin controller driver for NXP LPC MCUs

drivers/pinctrl/pinctrl_lpc_iocon.c

@@ -5,7 +5,9 @@
  */
 
 #include <zephyr/drivers/pinctrl.h>
+#if !defined(CONFIG_SOC_SERIES_LPC11U6X)
 #include <fsl_clock.h>
+#endif
 
 #define OFFSET(mux) (((mux) & 0xFFF00000) >> 20)
 #define TYPE(mux) (((mux) & 0xC0000) >> 18)
@@ -37,7 +39,7 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt,
 			break;
 		default:
 			/* Should not occur */
-			assert(TYPE(pin_mux <= IOCON_TYPE_A));
+			__ASSERT_NO_MSG(TYPE(pin_mux) <= IOCON_TYPE_A);
 		}
 		/* Set pinmux */
 		*(iocon + offset) = pin_mux;
@@ -45,8 +47,8 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt,
 	return 0;
 }
 
-#ifdef CONFIG_SOC_FAMILY_LPC
+#if defined(CONFIG_SOC_FAMILY_LPC) && !defined(CONFIG_SOC_SERIES_LPC11U6X)
-/* LPC family needs iocon clock to be enabled */
+/* LPC family (except 11u6x) needs iocon clock to be enabled */
 
 static int pinctrl_clock_init(const struct device *dev)
 {
@@ -58,4 +60,4 @@ static int pinctrl_clock_init(const struct device *dev)
 
 SYS_INIT(pinctrl_clock_init, PRE_KERNEL_1, 0);
 
-#endif /* CONFIG_SOC_FAMILY_LPC */
+#endif /* CONFIG_SOC_FAMILY_LPC  && !CONFIG_SOC_SERIES_LPC11U6X */

dts/bindings/pinctrl/nxp,lpc-iocon-pinctrl.yaml

@@ -40,6 +40,14 @@ description: |
   bias-pull-down: IOCON_MODE=1
   drive-push-pull: IOCON_MODE=3
 
+  Note: for the LPC11u6x, the following fields are also supported:
+  IOCON_HYS- set by input-schmitt-enable
+  IOCON_S_MODE- set by nxp,digital-filter
+  IOCON_CLKDIV- set by nxp,filter-clock-div
+  IOCON_FILTR- set by nxp,analog-filter
+
+
+
 compatible: "nxp,lpc-iocon-pinctrl"
 
 include:
@@ -52,6 +60,7 @@ include:
           - bias-pull-up
           - bias-pull-down
           - drive-push-pull
+          - input-schmitt-enable
 
 child-binding:
   description: LPC IOCON pin controller pin group

dts/bindings/pinctrl/nxp,lpc11u6x-pinctrl.yaml

@@ -0,0 +1,66 @@
+# Copyright 2022 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+compatible: "nxp,lpc11u6x-pinctrl"
+
+include:
+  - name: base.yaml
+  - name: nxp,lpc-iocon-pinctrl.yaml
+    child-binding:
+      child-binding:
+        property-allowlist:
+          - pinmux
+          - nxp,invert
+          - nxp,analog-mode
+          - nxp,i2c-mode
+          - nxp,i2c-filter
+  - name: pincfg-node-group.yaml
+    child-binding:
+      child-binding:
+        property-allowlist:
+          - drive-open-drain
+          - bias-pull-up
+          - bias-pull-down
+          - drive-push-pull
+          - input-schmitt-enable
+
+child-binding:
+  description: LPC IOCON pin controller pin group
+  child-binding:
+    description: |
+      LPC IOCON pin controller pin configuration node
+    properties:
+      nxp,digital-filter:
+        type: int
+        default: 0
+        enum:
+          - 0
+          - 1
+          - 2
+          - 3
+        description: |
+          Enable digital filter. Set number of clock cycles to use as rejection
+          threshold for input pulses. 0 disables the filter. Only valid for
+          lpc11u6x SOC. Filter defaults to disabled, as this is default reset
+          value for SOC
+      nxp,filter-clock-div:
+        type: int
+        default: 0
+        enum:
+          - 0
+          - 1
+          - 2
+          - 3
+          - 4
+          - 5
+          - 6
+        description: |
+          set peripheral clock divider for input filter sampling clock
+          IOCONCLKDIV. Only valid for lpc11u6x SOC. Default to 0, as this
+          is the default reset value for the SOC.
+      nxp,disable-analog-filter:
+        type: boolean
+        description: |
+          Disable fixed 10 ns input glitch analog filter. Only valid for lpc11u6x
+          SOC, on analog pins. Note that this filter is enabled on reset, hence
+          the choice to make disabling the filter opt-in