SPI: add Ingenic JZ47xx driver.

Add a driver to support the SPI controller found in Ingenic SoCs.
Co-developed-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Link: https://lore.kernel.org/r/20210830230139.21476-3-contact@artur-rojek.euSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/Kconfig

@@ -406,6 +406,15 @@ config SPI_IMX
 	help
 	  This enables support for the Freescale i.MX SPI controllers.
 
+config SPI_INGENIC
+	tristate "Ingenic JZ47xx SoCs SPI controller"
+	depends on MACH_INGENIC || COMPILE_TEST
+	help
+	  This enables support for the Ingenic JZ47xx SoCs SPI controller.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called spi-ingenic.
+
 config SPI_JCORE
 	tristate "J-Core SPI Master"
 	depends on OF && (SUPERH || COMPILE_TEST)

drivers/spi/Makefile

@@ -59,6 +59,7 @@ obj-$(CONFIG_SPI_HISI_KUNPENG)		+= spi-hisi-kunpeng.o
 obj-$(CONFIG_SPI_HISI_SFC_V3XX)		+= spi-hisi-sfc-v3xx.o
 obj-$(CONFIG_SPI_IMG_SPFI)		+= spi-img-spfi.o
 obj-$(CONFIG_SPI_IMX)			+= spi-imx.o
+obj-$(CONFIG_SPI_INGENIC)		+= spi-ingenic.o
 obj-$(CONFIG_SPI_LANTIQ_SSC)		+= spi-lantiq-ssc.o
 obj-$(CONFIG_SPI_JCORE)			+= spi-jcore.o
 obj-$(CONFIG_SPI_LM70_LLP)		+= spi-lm70llp.o