On Tue, Jul 16, 2019 at 03:45:18PM -0700, Stephen Boyd wrote: > From: Duncan Laurie <dlaurie@xxxxxxxxxxxx> > > Add TPM 2.0 compatible I2C interface for chips with cr50 firmware. > > The firmware running on the currently supported H1 MCU requires a > special driver to handle its specific protocol, and this makes it > unsuitable to use tpm_tis_core_* and instead it must implement the > underlying TPM protocol similar to the other I2C TPM drivers. > > - All 4 byes of status register must be read/written at once. > - FIFO and burst count is limited to 63 and must be drained by AP. > - Provides an interrupt to indicate when read response data is ready > and when the TPM is finished processing write data. > > This driver is based on the existing infineon I2C TPM driver, which > most closely matches the cr50 i2c protocol behavior. The driver is > intentionally kept very similar in structure and style to the > corresponding drivers in coreboot and depthcharge. > > Signed-off-by: Duncan Laurie <dlaurie@xxxxxxxxxxxx> > [swboyd@xxxxxxxxxxxx: Depend on i2c even if it's a module, replace > boilier plate with SPDX tag, drop asm/byteorder.h include, simplify > return from probe] > Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Apologies. I missed this when I stated my comment about SPI. /Jarkko
