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.

-- Thanks, Jagan.

Changes for v3: - renamed nr_flash into dual_flash along with macro names Changes for v2: - rebase to current spi tree - "option" variable on spi_slave so-that controller driver can specify which they use - Unify common code

Jagannadha Sutradharudu Teki (4): sf: ops: Unify read_ops bank configuration sf: Add dual memories support - DUAL_STACKED sf: Add dual memories support - DUAL_PARALLEL sf: Add CONFIG_SF_DUAL_FLASH

README | 6 +++ doc/SPI/README.dual-flash | 92 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/mtd/spi/sf.c | 4 ++ drivers/mtd/spi/sf_ops.c | 80 +++++++++++++++++++++++++++++++--------- drivers/mtd/spi/sf_probe.c | 21 ++++++++--- include/spi.h | 9 +++++ include/spi_flash.h | 11 ++++++ 7 files changed, 199 insertions(+), 24 deletions(-) create mode 100644 doc/SPI/README.dual-flash