On Wed, Mar 01, 2023 at 08:27:45AM -0400, Jason Gunthorpe wrote: > On Wed, Mar 01, 2023 at 11:56:53AM +0000, Krishna Yarlagadda wrote: > > TPM device connected behind half duplex controller can only work > > this way. So, no additional flag needed to check. > Just because a DT hooks it up this way doesn't mean the kernel driver > can support it, eg support hasn't been implemented in an older SPI > driver or something. > If the failure mode is anything other than the TPM doesn't probe we > will need to check for support. It's not like these buses are hot pluggable - someone would have to design and manufacture a board which doesn't work. It's probably reasonable for this to fail with the SPI subsystem saying it can't support things when the operation is tried.
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