Merge tag 'spi-fix-v4.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Merge tag 'spi-fix-v4.1-rc3' of git://git./linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A number of driver specific fixes (including several missing
  dependencies for randconfig type cases) plus two core fixes.

  One makes the setup_transfer() callback optional which unbreaks some
  drivers which had been merged with it omitted due to local versions of
  this patch and another ensures that we don't corrupt data by leaking
  internal dummy buffers to callers, causing the callers to think they
  allocated those buffers"

* tag 'spi-fix-v4.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: fsl-espi: fix behaviour for full-duplex xfers
  spi: fsl-spi: fix devm_ioremap_resource() error case
  spi: Kconfig: Add SOC_LS1021A to SPI_FSL_DSPI dependence
  spi/omap2-mcpsi: Always call spi_finalize_current_message()
  spi: fsl-spi: use devm_ioremap_resource() to map parameter ram on CPM1
  spi: bitbang: Make setup_transfer() callback optional
  spi: check tx_buf and rx_buf in spi_unmap_msg
  spi: bcm2835: change timeout of polling driver to 1s
  spi: bcm2835: Add GPIOLIB dependency