xtensa xtfpga SPI controller driver

Hello,

this series adds driver for SPI controller used on xtfpga xtensa platform, device tree binding documentation and an entry to MAINTAINERS.

Changes v2 -> v3:
- support all transfer widths in the range 1...16 bit;
- don't swap bytes of 16 bit transfers.

Changes v1 -> v2:
- support 8 bit transfers;
- busy-wait for maximum 100 usec (instead of 100 msec) polling BUSY register;
- use chipselect callback to check transfer size.

Max Filippov (3):
spi: add xtfpga SPI controller driver
spi/xtensa-xtfpga: add DT binding documentation
MAINTAINERS: add xtfpga platform section

 .../devicetree/bindings/spi/spi-xtensa-xtfpga.txt  |   9 ++
 MAINTAINERS                                        |   6 +
 drivers/spi/Kconfig                                |  13 ++
 drivers/spi/Makefile                               |   1 +
 drivers/spi/spi-xtensa-xtfpga.c                    | 170 +++++++++++++++++++++
 5 files changed, 199 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt
 create mode 100644 drivers/spi/spi-xtensa-xtfpga.c

1.8.1.4

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This simple SPI master controller is built into xtfpga bitstreams. It always transfers 16 bit words in SPI mode 0, automatically asserting CS on transfer start and deasserting on end.

---
Changes v2 -> v3:
- support all transfer widths in the range 1...16 bit;
- don't swap bytes of 16 bit transfers.

Changes v1 -> v2:
- support 8 bit transfers;
- busy-wait for maximum 100 usec (instead of 100 msec) polling BUSY register;
- use chipselect callback to check transfer size.

 drivers/spi/Kconfig             |  13 +++
 drivers/spi/Makefile            |   1 +
 drivers/spi/spi-xtensa-xtfpga.c | 170 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 184 insertions(+)
 create mode 100644 drivers/spi/spi-xtensa-xtfpga.c

index 581ee2a..e3f5335 100644
@@ -520,6 +520,19 @@ config SPI_XILINX
 
 	  Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)"
 
+config SPI_XTENSA_XTFPGA
+	tristate "Xtensa SPI controller for xtfpga"
+	depends on XTENSA && XTENSA_PLATFORM_XTFPGA
+	select SPI_BITBANG
+	help
+	  SPI driver for xtfpga SPI master controller.
+
+	  This simple SPI master controller is built into xtfpga bitstreams
+	  and is used to control daughterboard audio codec. It always transfers
+	  16 bit words in SPI mode 0, automatically asserting CS on transfer
+	  start and deasserting on end.
+
+
 config SPI_NUC900
 	tristate "Nuvoton NUC900 series SPI"
 	depends on ARCH_W90X900

index 95af48d..5379ade 100644
@@ -79,3 +79,4 @@ obj-$(CONFIG_SPI_TOPCLIFF_PCH)		+= spi-topcliff-pch.o
 obj-$(CONFIG_SPI_TXX9)			+= spi-txx9.o
 obj-$(CONFIG_SPI_XCOMM)		+= spi-xcomm.o
 obj-$(CONFIG_SPI_XILINX)		+= spi-xilinx.o
+obj-$(CONFIG_SPI_XTENSA_XTFPGA)		+= spi-xtensa-xtfpga.o

1.8.1.4

---
 Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt

new file mode 100644
index 0000000..b6ebe2b
@@ -0,0 +1,9 @@
+Cadence Xtensa XTFPGA platform SPI controller.
+
+This simple SPI master controller is built into xtfpga bitstreams and is used
+to control daughterboard audio codec.
+
+Required properties:
+- compatible: should be "cdns,xtfpga-spi".
+- reg: physical base address of the controller and length of memory mapped
+  region.

1.8.1.4

This section will list xtfpga platform-specific drivers.

---
 MAINTAINERS | 6 ++++++
 1 file changed, 6 insertions(+)

index c6d0e93..9f75849 100644
@@ -9768,6 +9768,12 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/tty/serial/uartlite.c
 
+XTENSA XTFPGA PLATFORM SUPPORT
+M:	Max Filippov <[email protected]>
+L:	linux-xtensa-PjhNF2WwrV/[email protected]
+S:	Maintained
+F:	drivers/spi/spi-xtensa-xtfpga.c
+
 YAM DRIVER FOR AX.25
 M:	Jean-Paul Roubelat <[email protected]>
 L:	[email protected]

1.8.1.4

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Applied all, thanks.