Initial working Clueboard California Macropad w/ proton-c fixes

* Basic Clueboard Californai Macropad shield definition.
* New "direct" KSCAN driver that supports non-matrix direct
  wiring for switches, needed for macropad that doesn't have
  a matrix at all.
* Some renames for existing KSCAN GPIO driver to make the implied
  "matrix" part explicit.

app/drivers/zephyr/CMakeLists.txt

@@ -4,6 +4,7 @@ if(CONFIG_ZMK_KSCAN_GPIO_DRIVER)
 
   zephyr_library()
   zephyr_library_sources(
-    kscan_gpio.c
+    kscan_gpio_matrix.c
+    kscan_gpio_direct.c
     )
 endif()

app/drivers/zephyr/Kconfig

@@ -3,6 +3,14 @@ config ZMK_KSCAN_GPIO_DRIVER
 	default y
 	select GPIO
 
+if ZMK_KSCAN_GPIO_DRIVER
+
+config ZMK_KSCAN_GPIO_POLLING
+	bool "Poll for key event triggers instead of using interrupts"
+	default n
+
+endif
+
 config ZMK_KSCAN_INIT_PRIORITY
 	int "Keyboard scan driver init priority"
 	default 40

app/drivers/zephyr/dts/bindings/zmk,kscan-gpio-matrix.yaml

@@ -3,7 +3,7 @@
 
 description: GPIO keyboard matrix controller
 
-compatible: "gpio-kscan"
+compatible: "zmk,kscan-gpio-matrix"
 
 include: kscan.yaml
 

app/drivers/zephyr/kscan_gpio_matrix.c

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: MIT
  */
 
-#define DT_DRV_COMPAT gpio_kscan
+#define DT_DRV_COMPAT zmk_kscan_gpio_matrix
 
 #include <device.h>
 #include <drivers/kscan.h>
@@ -13,6 +13,8 @@
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
+#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
+
 struct kscan_gpio_item_config
 {
 	char *label;
@@ -254,3 +256,5 @@ static int kscan_gpio_config_interrupts(struct device **devices,
 						&gpio_driver_api_##n);
 
 DT_INST_FOREACH_STATUS_OKAY(GPIO_INST_INIT)
+
+#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */