linux-kernel - [PATCH] tpm_crb: ffa_tpm: update comment to include 64-bit calling convention

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Message-Id: <20250429221519.1022170-2-stuart.yoder@arm.com>
Date: Tue, 29 Apr 2025 17:15:18 -0500
From: Stuart Yoder <stuart.yoder@....com>
To: linux-integrity@...r.kernel.org,
	jarkko@...nel.org,
	peterhuewe@....de,
	jgg@...pe.ca,
	sudeep.holla@....com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] tpm_crb: ffa_tpm: update comment to include 64-bit calling convention

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@....com>
---
 drivers/char/tpm/tpm_crb_ffa.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_crb_ffa.c b/drivers/char/tpm/tpm_crb_ffa.c
index 65b01a46d4b88..134747911ba38 100644
--- a/drivers/char/tpm/tpm_crb_ffa.c
+++ b/drivers/char/tpm/tpm_crb_ffa.c
@@ -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
-- 
2.34.1