dm: Convert TPM drivers to driver model

This series adds driver model support for Trusted Platform Modules (TPMs). These have a very simple interface and are configured via the device tree.

Two bus types are supported at present: I2C and LPC (Intel Low-Pin-Count).

Most drivers and users are converted over to driver model. The exception is the Atmel TPM and its users.

The I2C driver has been cleaned up and simplified. It was ported from Linux and was pretty hard to follow. This series includes patches to unify the code, remove duplicated data structures and drop unnecessary indirection.

Also this series enables the TPM on all Chromebooks supported by upstream U-Boot (snow, spring, nyan-big, pit, pi, link, panther) since some did not have it fully enabled.

As before, the 'tpm' command can be used to implement TPM functionality. In addition a 'tpmtest' command provides some basic TPM tests taken from Chrome OS U-Boot. These are fairly rudimentary but are useful if you know what you are doing.

Changes in v2:
- Add a 'TPM' menu in Kconfig
- Add new patch with a 'tpmtest' command
- Add new patch with functions to access flags and permissions
- Add tpm device tree node for panther also
- Correct error checking code in tpm_sendrecv_command()
- Correct error-checking code in report_return_code()
- Enable 'tpmtest' command for nyan
- Enhance uclass to support timeouts with new send()/recv() methods
- Implement the get_desc() method
- Include tpm.h header file instead of tis.h
- Move the timeout definitions into a new tpm_internal.h header
- Update cover letter to mention panther and the tpmtest command.
- Update driver for the new uclass interface
- Update driver for v2 TPM uclass which supports timeouts
- Use tpm_ prefix instead of tis_ for TPM functions

Simon Glass (28):
tpm: Remove old pre-driver-model I2C code
tpm: Drop two unused options
tpm: Add Kconfig options for TPMs
tpm: Convert board config TPM options to Kconfig
tpm: Convert drivers to use SPDX
tpm: Move the I2C TPM code into one file
tpm: tpm_tis_i2c: Drop unnecessary methods
tpm: tpm_tis_i2c: Drop struct tpm_vendor_specific
tpm: tpm_tis_i2c: Merge struct tpm_dev into tpm_chip
tpm: tpm_tis_i2c: Merge struct tpm into tpm_chip
tpm: tpm_tis_i2c: Move definitions into the header file
tpm: tpm_tis_i2c: Simplify init code
tpm: tpm_tis_i2c: Use a consistent tpm_tis_i2c_ prefix
tpm: tpm_tis_i2c: Tidy up delays
dm: tpm: Add a uclass for Trusted Platform Modules
dm: tpm: Convert the TPM command and library to driver model
dm: i2c: Add a command to adjust the offset length
tpm: Report tpm errors on the command line
dm: tpm: sandbox: Convert TPM driver to driver model
tpm: Check that parse_byte_string() has data to parse
exynos: x86: dts: Add tpm nodes to the device tree for Chrome OS
devices
dm: tpm: Convert I2C driver to driver model
dm: tpm: Convert LPC driver to driver model
tpm: Add a 'tpm info' command
tpm: Add functions to access flags and permissions
dm: tpm: Add a 'tpmtest' command
tpm: Enable 'tpmtest' command for Chrome OS boards with TPMs
tegra: nyan: Enable TPM command and driver

  README                                             |   6 -
  arch/arm/dts/exynos5250-snow.dts                   |   9 +
  arch/arm/dts/exynos5250-spring.dts                 |   8 +
  arch/arm/dts/exynos5420-peach-pit.dts              |   6 +-
  arch/arm/dts/exynos5800-peach-pi.dts               |   6 +-
  arch/sandbox/dts/sandbox.dts                       |   4 +
  arch/x86/dts/chromebook_link.dts                   |   5 +
  arch/x86/dts/chromebox_panther.dts                 |   5 +
  common/Kconfig                                     |  22 +
  common/Makefile                                    |   1 +
  common/cmd_i2c.c                                   |  33 +
  common/cmd_tpm.c                                   | 100 ++-
  common/cmd_tpm_test.c                              | 565 +++++++++++++++++
  configs/chromebook_link_defconfig                  |   5 +
  configs/chromebox_panther_defconfig                |   5 +
  .../controlcenterd_36BIT_SDCARD_DEVELOP_defconfig  |   4 +
  configs/controlcenterd_36BIT_SDCARD_defconfig      |   4 +
  .../controlcenterd_TRAILBLAZER_DEVELOP_defconfig   |   4 +
  configs/controlcenterd_TRAILBLAZER_defconfig       |   4 +
  configs/coreboot-x86_defconfig                     |   5 +
  configs/nyan-big_defconfig                         |   5 +
  configs/peach-pi_defconfig                         |   5 +
  configs/peach-pit_defconfig                        |   5 +
  configs/sandbox_defconfig                          |   4 +
  configs/snow_defconfig                             |   5 +
  configs/spring_defconfig                           |   5 +
  drivers/tpm/Kconfig                                |  69 ++
  drivers/tpm/Makefile                               |   4 +-
  drivers/tpm/tpm-uclass.c                           | 133 ++++
  drivers/tpm/tpm.c                                  | 694 ---------------------
  drivers/tpm/tpm_atmel_twi.c                        |  15 +-
  drivers/tpm/tpm_internal.h                         | 287 +++++++++
  drivers/tpm/tpm_tis_i2c.c                          | 572 ++++++++---------
  drivers/tpm/{tpm_private.h => tpm_tis_i2c.h}       |  88 +--
  drivers/tpm/tpm_tis_lpc.c                          | 290 ++++-----
  drivers/tpm/tpm_tis_sandbox.c                      |  57 +-
  include/configs/controlcenterd.h                   |   7 -
  include/configs/efi-x86.h                          |   2 -
  include/configs/exynos5-common.h                   |   7 -
  include/configs/x86-common.h                       |   2 -
  include/dm/uclass-id.h                             |   1 +
  include/fdtdec.h                                   |   2 -
  include/tis.h                                      |   3 +
  include/tpm.h                                      | 243 +++++++-
  lib/Kconfig                                        |  10 +
  lib/fdtdec.c                                       |   2 -
  lib/tpm.c                                          |  82 ++-
  47 files changed, 2102 insertions(+), 1298 deletions(-)

create mode 100644 common/cmd_tpm_test.c
create mode 100644 drivers/tpm/tpm-uclass.c delete mode 100644 drivers/tpm/tpm.c
create mode 100644 drivers/tpm/tpm_internal.h rename drivers/tpm/{tpm_private.h => tpm_tis_i2c.h} (54%)