spi: fsi: Check mux status before transfers
The SPI controllers are not accessible if the mux isn't set. Therefore, check the mux status before starting a transfer and fail out if it isn't set. Signed-off-by: NEddie James <eajames@linux.ibm.com> Signed-off-by: NJoel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20200909222857.28653-7-eajames@linux.ibm.comSigned-off-by: NMark Brown <broonie@kernel.org>
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