kernel: add support for DesignWare SPI MMIO controller

Add kernel packages for DesignWare SPI core and MMIO controllers.
This is needed for the RP1 SoC found on RPi 5 devices.

Tested with a Microchip ENC28J60 Ethernet controller on a RPi 5.

Signed-off-by: Albrecht Lohofener <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19049
Signed-off-by: Álvaro Fernández Rojas <[email protected]>
(cherry picked from commit 82d20a0fbde937365f2ad6b4f9b754971c5c6ab2)

package/kernel/linux/modules/spi.mk

@@ -73,3 +73,41 @@ define KernelPackage/spi-dev/description
 endef
 
 $(eval $(call KernelPackage,spi-dev))
+
+
+define KernelPackage/spi-dw
+  SUBMENU:=$(SPI_MENU)
+  TITLE:=DesignWare SPI controller driver (core)
+  KCONFIG:=\
+    CONFIG_SPI=y \
+    CONFIG_SPI_DESIGNWARE \
+    CONFIG_SPI_DYNAMIC=y \
+    CONFIG_SPI_MASTER=y
+  FILES:=\
+    $(LINUX_DIR)/drivers/spi/spi-dw.ko
+  AUTOLOAD:=$(call AutoProbe,spi-dw)
+endef
+
+define KernelPackage/spi-dw/description
+ This package contains the DesignWare SPI core driver.
+endef
+
+$(eval $(call KernelPackage,spi-dw))
+
+
+define KernelPackage/spi-dw-mmio
+  SUBMENU:=$(SPI_MENU)
+  TITLE:=DesignWare SPI controller driver (MMIO)
+  DEPENDS:=+kmod-spi-dw
+  KCONFIG:=\
+    CONFIG_SPI_DW_MMIO
+  FILES:=\
+    $(LINUX_DIR)/drivers/spi/spi-dw-mmio.ko
+  AUTOLOAD:=$(call AutoProbe,spi-dw-mmio)
+endef
+
+define KernelPackage/spi-dw-mmio/description
+ This package contains the DesignWare SPI MMIO driver.
+endef
+
+$(eval $(call KernelPackage,spi-dw-mmio))

target/linux/generic/config-6.6

@@ -6218,6 +6218,11 @@ CONFIG_SND_X86=y
 # CONFIG_SPI_CADENCE_XSPI is not set
 # CONFIG_SPI_DEBUG is not set
 # CONFIG_SPI_DESIGNWARE is not set
+# CONFIG_SPI_DW_BT1 is not set
+# CONFIG_SPI_DW_BT1_DIRMAP is not set
+# CONFIG_SPI_DW_DMA is not set
+# CONFIG_SPI_DW_MMIO is not set
+# CONFIG_SPI_DW_PCI is not set
 # CONFIG_SPI_FSL_DSPI is not set
 # CONFIG_SPI_FSL_ESPI is not set
 # CONFIG_SPI_FSL_SPI is not set