linux-kernel - [PATCH] tpm: Add new device/vendor ID 0x50666666

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Date: Mon, 10 Jun 2024 13:25:14 -0600
From: Jett Rink <jettrink@...omium.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: jettrink@...omium.org,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Peter Huewe <peterhuewe@....de>,
	linux-integrity@...r.kernel.org
Subject: [PATCH] tpm: Add new device/vendor ID 0x50666666

Accept another DID:VID for the next generation Google TPM. This TPM
has the same Ti50 firmware and fulfills the same interface.

Signed-off-by: Jett Rink <jettrink@...omium.org>
---

 drivers/char/tpm/tpm_tis_i2c_cr50.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
index 86c9a1a43adb..d9b6abdcda5f 100644
--- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
+++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
@@ -32,7 +32,8 @@
 #define TPM_CR50_TIMEOUT_SHORT_MS	2		/* Short timeout during transactions */
 #define TPM_CR50_TIMEOUT_NOIRQ_MS	20		/* Timeout for TPM ready without IRQ */
 #define TPM_CR50_I2C_DID_VID		0x00281ae0L	/* Device and vendor ID reg value */
-#define TPM_TI50_I2C_DID_VID		0x504a6666L	/* Device and vendor ID reg value */
+#define TPM_TI50_DT_I2C_DID_VID		0x504a6666L	/* Device and vendor ID reg value */
+#define TPM_TI50_OT_I2C_DID_VID		0x50666666L	/* Device and vendor ID reg value */
 #define TPM_CR50_I2C_MAX_RETRIES	3		/* Max retries due to I2C errors */
 #define TPM_CR50_I2C_RETRY_DELAY_LO	55		/* Min usecs between retries on I2C */
 #define TPM_CR50_I2C_RETRY_DELAY_HI	65		/* Max usecs between retries on I2C */
@@ -781,13 +782,17 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
 	}
 
 	vendor = le32_to_cpup((__le32 *)buf);
-	if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) {
+	if (vendor != TPM_CR50_I2C_DID_VID &&
+	    vendor != TPM_TI50_DT_I2C_DID_VID &&
+	    vendor != TPM_TI50_OT_I2C_DID_VID) {
 		dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
 		return -ENODEV;
 	}
 
 	dev_info(dev, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
-		 vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50",
+		 vendor == TPM_CR50_I2C_DID_VID	   ? "cr50" :
+		 vendor == TPM_TI50_DT_I2C_DID_VID ? "ti50 DT" :
+						     "ti50 OT",
 		 client->addr, client->irq, vendor >> 16);
 	return tpm_chip_register(chip);
 }
-- 
2.45.2.505.gda0bf45e8d-goog