drivers: fpga: add an init priority config option

Add a Kconfig option for FPGA device initialization priority.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

drivers/fpga/Kconfig

@@ -14,6 +14,12 @@ module = fpga
 module-str = fpga
 source "subsys/logging/Kconfig.template.log_config"
 
+config FPGA_INIT_PRIORITY
+	int "Init priority"
+	default 75
+	help
+	  FPGA device drivers initialization priority
+
 config FPGA_SHELL
 	bool "FPGA Shell"
 	depends on SHELL && FPGA

drivers/fpga/fpga_eos_s3.c

@@ -149,4 +149,4 @@ static const struct fpga_driver_api eos_s3_api = {
 };
 
 DEVICE_DT_DEFINE(DT_NODELABEL(fpga0), &eos_s3_fpga_init, NULL, &fpga_data, NULL, APPLICATION,
-	      CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &eos_s3_api);
+	      CONFIG_FPGA_INIT_PRIORITY, &eos_s3_api);

drivers/fpga/fpga_ice40.c

@@ -596,6 +596,7 @@ static int fpga_ice40_init(const struct device *dev)
 		FPGA_ICE40_PINCTRL_CONFIG(inst)};                                                  \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(inst, fpga_ice40_init, NULL, &fpga_ice40_data_##inst,                \
-			      &fpga_ice40_config_##inst, POST_KERNEL, 0, &fpga_ice40_api);
+			      &fpga_ice40_config_##inst, POST_KERNEL, CONFIG_FPGA_INIT_PRIORITY,   \
+			      &fpga_ice40_api);
 
 DT_INST_FOREACH_STATUS_OKAY(FPGA_ICE40_DEFINE)

drivers/fpga/fpga_zynqmp.c

@@ -323,4 +323,4 @@ static const struct fpga_driver_api zynqmp_api = {
 };
 
 DEVICE_DT_INST_DEFINE(0, &zynqmp_fpga_init, NULL, &fpga_data, NULL,
-	      APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &zynqmp_api);
+	      APPLICATION, CONFIG_FPGA_INIT_PRIORITY, &zynqmp_api);