spi: atcspi200: Add support for Andes ATCSPI200 SPI

Merge series from CL Wang <cl634@andestech.com>:

This series adds support for the Andes ATCSPI200 SPI controller.

Author: broonie

Documentation/devicetree/bindings/spi/andestech,ae350-spi.yaml

@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/andestech,ae350-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Andes ATCSPI200 SPI controller
+
+maintainers:
+  - CL Wang <cl634@andestech.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - andestech,qilai-spi
+          - const: andestech,ae350-spi
+      - const: andestech,ae350-spi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  num-cs:
+    description: Number of chip selects supported
+    maxItems: 1
+
+  dmas:
+    items:
+      - description: Transmit FIFO DMA channel
+      - description: Receive FIFO DMA channel
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+patternProperties:
+  "@[0-9a-f]+$":
+    type: object
+    additionalProperties: true
+
+    properties:
+      spi-rx-bus-width:
+        enum: [1, 4]
+
+      spi-tx-bus-width:
+        enum: [1, 4]
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - dmas
+  - dma-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi@f0b00000 {
+        compatible = "andestech,ae350-spi";
+        reg = <0xf0b00000 0x100>;
+        clocks = <&clk_spi>;
+        dmas = <&dma0 0>, <&dma0 1>;
+        dma-names = "tx", "rx";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            compatible = "jedec,spi-nor";
+            reg = <0>;
+            spi-tx-bus-width = <4>;
+            spi-rx-bus-width = <4>;
+            spi-cpol;
+            spi-cpha;
+        };
+    };

MAINTAINERS

@@ -1817,6 +1817,12 @@ S:	Supported
 F:	drivers/clk/analogbits/*
 F:	include/linux/clk/analogbits*
 
+ANDES ATCSPI200 SPI DRIVER
+M:	CL Wang <cl634@andestech.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/spi/andestech,ae350-spi.yaml
+F:	drivers/spi/spi-atcspi200.c
+
 ANDROID DRIVERS
 M:	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 M:	Arve Hjønnevåg <arve@android.com>

drivers/spi/Kconfig

@@ -136,6 +136,15 @@ config SPI_AR934X
 	  This enables support for the SPI controller present on the
 	  Qualcomm Atheros AR934X/QCA95XX SoCs.
 
+config SPI_ATCSPI200
+	tristate "Andes ATCSPI200 SPI controller"
+	depends on ARCH_ANDES
+	help
+	  SPI driver for Andes ATCSPI200 SPI controller.
+	  ATCSPI200 controller supports DMA and PIO modes. When DMA
+	  is not available, the driver automatically falls back to
+	  PIO mode.
+
 config SPI_ATH79
 	tristate "Atheros AR71XX/AR724X/AR913X SPI controller driver"
 	depends on ATH79 || COMPILE_TEST

drivers/spi/Makefile

@@ -26,6 +26,7 @@ obj-$(CONFIG_SPI_APPLE)			+= spi-apple.o
 obj-$(CONFIG_SPI_AR934X)		+= spi-ar934x.o
 obj-$(CONFIG_SPI_ARMADA_3700)		+= spi-armada-3700.o
 obj-$(CONFIG_SPI_ASPEED_SMC)		+= spi-aspeed-smc.o
+obj-$(CONFIG_SPI_ATCSPI200)		+= spi-atcspi200.o
 obj-$(CONFIG_SPI_ATMEL)			+= spi-atmel.o
 obj-$(CONFIG_SPI_ATMEL_QUADSPI)		+= atmel-quadspi.o
 obj-$(CONFIG_SPI_AT91_USART)		+= spi-at91-usart.o