drivers: fpga: separate drivers of iCE40 for SPI and GPIO bitbang

Separate the current driver for the FPGA iCE40 into two different ones.
One implements only the SPI load mode, the other one only the GPIO
bitbang mode.

Signed-off-by: Benedikt Schmidt <[email protected]>

Author: benediktibk

doc/releases/release-notes-4.1.rst

@@ -130,6 +130,12 @@ Drivers and Sensors
 
 * Flash
 
+* FPGA
+
+  * Extracted from :dtcompatible:`lattice,ice40-fpga` the compatible and driver for
+    :dtcompatible:`lattice,ice40-fpga-bitbang`. This replaces the original ``load_mode`` property from
+    the binding, which selected either the SPI or GPIO bitbang load mode.
+
 * GNSS
 
 * GPIO

drivers/fpga/CMakeLists.txt

@@ -6,7 +6,9 @@ zephyr_library_sources_ifdef(CONFIG_FPGA_SHELL  fpga_shell.c)
 
 zephyr_library_sources_ifdef(CONFIG_ALTERA_AGILEX_BRIDGE_FPGA     fpga_altera_agilex_bridge.c)
 zephyr_library_sources_ifdef(CONFIG_EOS_S3_FPGA fpga_eos_s3.c)
-zephyr_library_sources_ifdef(CONFIG_ICE40_FPGA  fpga_ice40.c)
+zephyr_library_sources_ifdef(CONFIG_ICE40_FPGA  fpga_ice40_common.c)
+zephyr_library_sources_ifdef(CONFIG_ICE40_FPGA_SPI  fpga_ice40_spi.c)
+zephyr_library_sources_ifdef(CONFIG_ICE40_FPGA_BITBANG  fpga_ice40_bitbang.c)
 zephyr_library_sources_ifdef(CONFIG_MPFS_FPGA fpga_mpfs.c)
 zephyr_library_sources_ifdef(CONFIG_ZYNQMP_FPGA fpga_zynqmp.c)
 zephyr_library_sources_ifdef(CONFIG_SLG471X5_FPGA fpga_slg471x5.c)

drivers/fpga/Kconfig.ice40

@@ -1,10 +1,31 @@
 # Copyright (c) 2022 Meta
 # SPDX-License-Identifier: Apache-2.0
 
-config ICE40_FPGA
-	bool "Lattice iCE40 fpga driver [EXPERIMENTAL]"
-	select EXPERIMENTAL
+menuconfig ICE40_FPGA
+	bool "Lattice iCE40 fpga driver"
+	default y
+	depends on (DT_HAS_LATTICE_ICE40_FPGA_ENABLED || \
+		   DT_HAS_LATTICE_ICE40_FPGA_BITBANG_ENABLED)
 	imply CRC
 	depends on SPI
 	help
 	  Enable support for the Lattice iCE40 fpga driver.
+
+if ICE40_FPGA
+
+config ICE40_FPGA_SPI
+	bool "Lattice iCE40 fpga SPI driver"
+	default y
+	depends on DT_HAS_LATTICE_ICE40_FPGA_ENABLED
+	help
+	  Enable support for the Lattice iCE40 fpga SPI driver.
+
+config ICE40_FPGA_BITBANG
+	bool "Lattice iCE40 fpga driver GPIO bitbang"
+	default y
+	select EXPERIMENTAL
+	depends on DT_HAS_LATTICE_ICE40_FPGA_BITBANG_ENABLED
+	help
+	  Enable support for the Lattice iCE40 fpga GPIO bitbang driver.
+
+endif # ICE40_FPGA