usb: typec: tcpci: Add support when hidden tx registers are inaccessible

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TCPCI spec forbids direct access of TX_BUF_BYTE_x register.
The existing version of tcpci driver assumes that those registers
are directly addressible. Add support for tcpci chips which do
not support direct access to TX_BUF_BYTE_x registers. TX_BUF_BYTE_x
can only be accessed by I2C_WRITE_BYTE_COUNT.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20200901025927.3596190-3-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Badhri Jagan Sridharan 2020-08-31 19:59:15 -07:00 • committed by Greg Kroah-Hartman

parent 492c1dc9d0

commit 19b6547683

2 changed files with 43 additions and 11 deletions

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46

drivers/usb/typec/tcpm/tcpci.c

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8

drivers/usb/typec/tcpm/tcpci.h

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