mtd: spi-nor: add hisilicon spi-nor flash controller driver

Add hisilicon spi-nor flash controller driver
Signed-off-by: Binquan Peng <pengbinquan@hisilicon.com>
Signed-off-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt

+HiSilicon SPI-NOR Flash Controller
+
+Required properties:
+- compatible : Should be "hisilicon,fmc-spi-nor" and one of the following strings:
+		"hisilicon,hi3519-spi-nor"
+- address-cells : Should be 1.
+- size-cells : Should be 0.
+- reg : Offset and length of the register set for the controller device.
+- reg-names : Must include the following two entries: "control", "memory".
+- clocks : handle to spi-nor flash controller clock.
+
+Example:
+spi-nor-controller@10000000 {
+	compatible = "hisilicon,hi3519-spi-nor", "hisilicon,fmc-spi-nor";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	reg = <0x10000000 0x1000>, <0x14000000 0x1000000>;
+	reg-names = "control", "memory";
+	clocks = <&clock HI3519_FMC_CLK>;
+	spi-nor@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+	};
+};

drivers/mtd/spi-nor/Kconfig

@@ -38,6 +38,13 @@ config SPI_FSL_QUADSPI
 	  This controller does not support generic SPI. It only supports
 	  SPI NOR.
 
+config SPI_HISI_SFC
+	tristate "Hisilicon SPI-NOR Flash Controller(SFC)"
+	depends on ARCH_HISI || COMPILE_TEST
+	depends on HAS_IOMEM && HAS_DMA
+	help
+	  This enables support for hisilicon SPI-NOR flash controller.
+
 config SPI_NXP_SPIFI
 	tristate "NXP SPI Flash Interface (SPIFI)"
 	depends on OF && (ARCH_LPC18XX || COMPILE_TEST)

drivers/mtd/spi-nor/Makefile

 obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
 obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
+obj-$(CONFIG_SPI_HISI_SFC)	+= hisi-sfc.o
 obj-$(CONFIG_MTD_MT81xx_NOR)    += mtk-quadspi.o
 obj-$(CONFIG_SPI_NXP_SPIFI)	+= nxp-spifi.o