This patchset adds support for dual flash memory accessing with single chipselect line from the controller.

dual flash memory support is implemented in xilinx zynq qspi controllers in which dual stacked and dual parallel are the connection modes.

Currently added these connection modes support on winbond and spansion flash parts, request for respective vendor should validate these support.

REQUEST FOR ALL SPI CODE CONTRIBUTORS/USERS, PLEASE TEST THESE CHANGES W.R.T YOUR HW IF POSSIBLE.

Please let me know for any issues/concerns/questions.

-- Thanks, Jagan.

Jagannadha Sutradharudu Teki (5): sf: Add support for accessing dual parallel memories sf: spansion|stmicro: Enable dual parallel access sf: Add support for accessing dual stacked memories sf: spansion|stmicro: Enable dual stacked access sf: Add bank selection support for dual stacked access

doc/README.spi-flash-conn-modes | 104 ++++++++++++++++++++++++++++++++++++++++ drivers/mtd/spi/spansion.c | 9 ++++ drivers/mtd/spi/spi_flash.c | 91 +++++++++++++++++++++++++++++------ drivers/mtd/spi/stmicro.c | 9 ++++ include/spi.h | 5 ++ include/spi_flash.h | 8 ++++ 6 files changed, 211 insertions(+), 15 deletions(-) create mode 100644 doc/README.spi-flash-conn-modes