kscan: sdl: Convert driver over to devicetree

Move kscan SDL driver to be based on devicetree.  This is similar to
how the display SDL driver works.

Signed-off-by: Kumar Gala <galak@kernel.org>

boards/posix/native_posix/Kconfig.defconfig

@@ -50,10 +50,6 @@ config UART_CONSOLE
 
 endif # CONSOLE
 
-config KSCAN_SDL
-	default y
-	depends on KSCAN
-
 config FLASH_SIMULATOR
 	default y
 	depends on FLASH

boards/posix/native_posix/native_posix.dts

@@ -30,6 +30,7 @@
 		i2c-0 = &i2c0;
 		spi-0 = &spi0;
 		led0 = &led0;
+		kscan0 = &sdl_kscan;
 	};
 
 	leds {
@@ -181,6 +182,10 @@
 		width = <320>;
 	};
 
+	sdl_kscan: sdl_kscan {
+		compatible = "zephyr,sdl-kscan";
+	};
+
 	can_loopback0: can_loopback0 {
 		status = "disabled";
 		compatible = "zephyr,can-loopback";

drivers/kscan/Kconfig.sdl

@@ -3,12 +3,8 @@
 
 config KSCAN_SDL
 	bool "SDL event filter for touch panel emulation"
+	default y
+	depends on DT_HAS_ZEPHYR_SDL_KSCAN_ENABLED
 	depends on HAS_SDL
 	help
 	  Enable driver for the SDL mouse event filter.
-
-config SDL_POINTER_KSCAN_DEV_NAME
-	string "SDL kscan device name"
-	depends on KSCAN_SDL
-	default LV_Z_POINTER_KSCAN_DEV_NAME if LVGL
-	default "SDL_KSCAN"

drivers/kscan/kscan_sdl.c

@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#define DT_DRV_COMPAT zephyr_sdl_kscan
+
 #include <zephyr/drivers/kscan.h>
 #include <zephyr/logging/log.h>
 
@@ -106,7 +108,7 @@ static const struct kscan_driver_api sdl_driver_api = {
 
 static struct sdl_data sdl_data;
 
-DEVICE_DEFINE(sdl, CONFIG_SDL_POINTER_KSCAN_DEV_NAME, sdl_init,
+DEVICE_DT_INST_DEFINE(0, sdl_init,
 		    NULL, &sdl_data, NULL,
 		    POST_KERNEL, CONFIG_KSCAN_INIT_PRIORITY,
 		    &sdl_driver_api);

dts/bindings/kscan/zephyr,sdl-kscan.yaml

@@ -0,0 +1,8 @@
+# Copyright (c) 2022 Kumar Gala <galak@kernel.org>
+# SPDX-License-Identifier: Apache-2.0
+
+description: SDL based emulated keyboard matrix devices
+
+compatible: "zephyr,sdl-kscan"
+
+include: kscan.yaml