Messages in this thread | | | Date | Thu, 14 Jul 2016 21:28:14 -0600 | From | Jason Gunthorpe <> | Subject | Re: [PATCH 0/2] tpm: add driver for cr50 on SPI |
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On Thu, Jul 14, 2016 at 07:50:26PM -0700, Andrey Pronin wrote: > Yes, it has a TCG-compliant interface, however, there are several things > specific to this device: > - need to ensure a certain delay between spi transactions, or else > the chip can miss several first bytes. > - if there is no spi activity for this chip, it may go to sleep, and > needs to be waken up before sending further commands. > - it has some vendor-specific registers accessible from spi bus.
This all needs to be commented clearly in the driver..
The chip sounds pretty broken...
Jason
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