linux-kernel - Re: [PATCHv9] drivers: optee: allow op-tee to access devices on the i2c bus

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Date:   Fri, 21 Aug 2020 08:21:21 +0200
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Jorge Ramirez-Ortiz <jorge@...ndries.io>
Cc:     sumit.garg@...aro.org, ricardo@...ndries.io, mike@...ndries.io,
        tee-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv9] drivers: optee: allow op-tee to access devices on the
 i2c bus

On Fri, Aug 14, 2020 at 01:12:21PM +0200, Jorge Ramirez-Ortiz wrote:
> Some secure elements like NXP's SE050 sit on I2C buses. For OP-TEE to
> control this type of cryptographic devices it needs coordinated access
> to the bus, so collisions and RUNTIME_PM dont get in the way.
> 
> This trampoline driver allow OP-TEE to access them.
> 
> Signed-off-by: Jorge Ramirez-Ortiz <jorge@...ndries.io>
> ---
> v9: params return value must be written before optee_msg_to_param is called
> v8: review fixes:
>     fix types and add TEEC_ERROR_NOT_SUPPORTED to GP errors
> v7: add support for ten bit i2c slave addressing
> v6: compile out if CONFIG_I2C not enabled
> v5: alphabetic order of includes
> v4: remove unnecessary extra line in optee_msg.h
> v3: use from/to msg param to support all types of memory
>     modify OPTEE_MSG_RPC_CMD_I2C_TRANSFER message id
> 
>  drivers/tee/optee/optee_msg.h     | 21 +++++++
>  drivers/tee/optee/optee_private.h |  1 +
>  drivers/tee/optee/rpc.c           | 95 +++++++++++++++++++++++++++++++
>  3 files changed, 117 insertions(+)

Looks good. Did you test this with the recently merged
https://github.com/OP-TEE/optee_os/pull/4033 ?

Cheers,
Jens