mtd: rawnand: Add Phytium NAND flash controller support

This patch implements a device driver of NAND flash controller
for both Phytium PCIe chipset and SoCs. Since interrupt flags
depends on the bus implementation, e.g., PCI vs platform,
we extract the interrupt register function from NFC driver core.

Signed-off-by: Zhu Mingshuai <[email protected]>
Signed-off-by: Zhou Yulin <[email protected]>
Signed-off-by: Chen Baozi <[email protected]>
Signed-off-by: Wang Yinfeng <[email protected]>
Signed-off-by: Hu Yeqing <[email protected]>

Author: Hu Yeqing

Documentation/devicetree/bindings/mtd/phytium,nfc.yaml

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/phytium,nfc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Phytium Nand Flash controller
+
+maintainers:
+  - Chen Baozi <[email protected]>
+
+properties:
+  compatible:
+    const: phytium,nfc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  nand-ecc-strength:
+    const: 8
+
+  nand-ecc-step-size:
+    const: 512
+
+allOf:
+  - $ref: "nand-controller.yaml#"
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+examples:
+  - |
+    nand0: nand@28002000 {
+      compatible = "phytium,nfc";
+      reg = <0x0 0x28002000 0x0 0x1000>;
+      interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;
+    };

drivers/mtd/nand/raw/Kconfig

@@ -150,6 +150,25 @@ config MTD_NAND_ORION
 	  No board specific support is done by this driver, each board
 	  must advertise a platform_device for the driver to attach.
 
+config MTD_NAND_PHYTIUM
+	tristate
+
+config MTD_NAND_PHYTIUM_PCI
+	tristate "Support Phytium NAND controller as a PCI device"
+	select MTD_NAND_PHYTIUM
+	depends on PCI
+	help
+	  Enable the driver for NAND flash controller of Phytium Px210 chipset,
+	  using the Phytium NAND controller core.
+
+config MTD_NAND_PHYTIUM_PLAT
+	tristate "Support Phytium NAND controller as a platform device"
+	select MTD_NAND_PHYTIUM
+	depends on ARCH_PHYTIUM
+	help
+	  Enable the driver for NAND flash controller of Phytium CPU chipset,
+	  using the Phytium NAND controller core.
+
 config MTD_NAND_MARVELL
 	tristate "Marvell EBU NAND controller"
 	depends on PXA3xx || ARCH_MMP || PLAT_ORION || ARCH_MVEBU || \

drivers/mtd/nand/raw/Makefile

@@ -57,6 +57,9 @@ obj-$(CONFIG_MTD_NAND_INTEL_LGM)	+= intel-nand-controller.o
 obj-$(CONFIG_MTD_NAND_ROCKCHIP)		+= rockchip-nand-controller.o
 obj-$(CONFIG_MTD_NAND_PL35X)		+= pl35x-nand-controller.o
 obj-$(CONFIG_MTD_NAND_RENESAS)		+= renesas-nand-controller.o
+obj-$(CONFIG_MTD_NAND_PHYTIUM)		+= phytium_nand.o
+obj-$(CONFIG_MTD_NAND_PHYTIUM_PCI)	+= phytium_nand_pci.o
+obj-$(CONFIG_MTD_NAND_PHYTIUM_PLAT)	+= phytium_nand_plat.o
 
 nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
 nand-objs += nand_onfi.o