mtd: fsl-quadspi: Access multiple chips simultaneously
Add supports for simultaneous access to multiple chips. Need to lock the mutex before any quad spi operations and unlock the mutex after operations complete. Signed-off-by:Han Xu <b45815@freescale.com> [Brian: reworked err path in fsl_qspi_prep()] Signed-off-by:
Brian Norris <computersforpeace@gmail.com>
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