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TPM specification [1] defines flow control over SPI. Client device can insert a wait state on MISO when address is transmitted by controller on MOSI. Detecting the wait state in software is only possible for full duplex controllers. For controllers that support only half- duplex, the wait state detection needs to be implemented in hardware. Add a flag SPI_TPM_HW_FLOW for TPM device to set when software flow control is not possible and hardware flow control is expected from SPI controller. Reference: [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm -profile-ptp-specification/ Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Link: https://lore.kernel.org/r/20230421091309.2672-2-kyarlagadda@nvidia.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.