[v2,0/4] Fix currently available support for flash on HiFive Unleashed

Currently device ID for flash mounted on HiFive Unleashed is added to
U-Boot. Also there are few patches about to go in mainline (Thanks to
Jagan Tekki and Bin Meng).

This series addresses few issues discussed there:
Patch 1:Add num-cs to device tree which is used by spi-uclass to detect
	valid chip select numbers 
Patch 2:Handles valid chip selects only. Flash device is now detected only
	on chip select 0.
Patch 3:Over-ride spi tx/rx width specified in hifive-unleshed-a00.dts file
	from 4 to 1 in corresponding -u-boot.dtsi
	      	 
This series is based on mainline commit c05b38df477a ("common: fix
regression on block cache init") and two below mentioned patches from [1]
[U-Boot,v2,4/5] riscv: dts: hifive-unleashed-a00: Add -u-boot.dtsi
[U-Boot,v2,5/5] sifive: fu540: Enable spi-nor flash support
 
[1] https://patchwork.ozlabs.org/patch/1177979/

The above series is available for testing here[2]
[2] https://github.com/sagsifive/u-boot/tree/dev/sagark/test_spi-nor_v2

Change History:
V1-V2: 
1. Dropped 6th and 7th patch sent in V1 from this series so as to separate
   out spi-nor related changes in different series and avoid adding TODO
   fixes to spi-nor-core framework. 
2. Removed patch to include -uboot.dts, as it gets automatically included.
3. Over-ride tx/rx width from hifive-unleashed-a00.dts using hifive
   -unleashed-a00-u-boot.dtsi
4. Print fdt base address in board info for debugging.

V1: First version of series


================Log for reference=====================
Flash detection only at valid Chip select
=> sf probe 0:0
SF: Detected is25wp256 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
=> sf probe 0:1
Invalid cs number = 1
Failed to initialize SPI flash at 0:1 (error -22)
=> sf probe 0:2
Invalid cs number = 2
Failed to initialize SPI flash at 0:2 (error -22)
=> sf probe 0:0
SF: Detected is25wp256 with page size 256 Bytes, erase size 4 KiB, total 32 MiB

=>----------------------------------------------------------------
Full flash memory erase/write/read/validate
=> mw 0x80600000 0x12348765 0x800000
=> sf erase 0x0 0x2000000
SF: 33554432 bytes @ 0x0 Erased: OK
=> sf write 0x80600000 0x0 0x2000000
device 0 whole chip
SF: 33554432 bytes @ 0x0 Written: OK
=> sf read  0x82600000 0x0 0x2000000
device 0 whole chip
SF: 33554432 bytes @ 0x0 Read: OK
=> cmp.b 0x80600000 0x82600000 0x2000000
Total of 33554432 byte(s) were the same
=>----------------------------------------------------------------

Sagar Shrikant Kadam (4):
  fu540: dtsi: spi: add num-cs info to device tree
  spi: fu540: add claim and release method to spi-sifive.c
  dts: u-boot.dtsi: override flash tx-rx width
  bdinfo: fu540: print fdt base address for debugging

 arch/riscv/dts/fu540-c000.dtsi                  |  3 +++
 arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi |  8 ++++++
 cmd/bdinfo.c                                    |  1 +
 drivers/spi/spi-sifive.c                        | 36 +++++++++++++++++++++++++
 4 files changed, 48 insertions(+)