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tpm_crb: ffa_tpm: fix/update comments describing the CRB over FFA ABI

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-Fix the comment describing the 'start' function, which was a cut/paste
 mistake for a different function.

-The comment for DIRECT_REQ and DIRECT_RESP only mentioned AArch32
 and listed 32-bit function IDs.  Update to include 64-bit.

Signed-off-by: Stuart Yoder <stuart.yoder@arm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Stuart Yoder 2025-04-30 10:47:23 -05:00 committed by Jarkko Sakkinen
parent 8d67b79bcc
commit ecc1ca9185
1 changed files with 7 additions and 4 deletions
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11
drivers/char/tpm/tpm_crb_ffa.c
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@ -38,9 +38,11 @@
* messages.
*
* All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP
* are using the AArch32 SMC calling convention with register usage as
* defined in FF-A specification:
* w0: Function ID (0x8400006F or 0x84000070)
* are using the AArch32 or AArch64 SMC calling convention with register usage
* as defined in FF-A specification:
* w0: Function ID
* -for 32-bit: 0x8400006F or 0x84000070
* -for 64-bit: 0xC400006F or 0xC4000070
* w1: Source/Destination IDs
* w2: Reserved (MBZ)
* w3-w7: Implementation defined, free to be used below
@ -68,7 +70,8 @@
#define CRB_FFA_GET_INTERFACE_VERSION 0x0f000001
/*
* Return information on a given feature of the TPM service
* Notifies the TPM service that a TPM command or TPM locality request is
* ready to be processed, and allows the TPM service to process it.
* Call register usage:
* w3: Not used (MBZ)
* w4: TPM service function ID, CRB_FFA_START