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List:       linux-integrity
Subject:    [PATCH] tpm_tis_spi: Add compatible string atmel,attpm20p
From:       Lukas Wunner <lukas () wunner ! de>
Date:       2023-12-23 9:34:39
Message-ID: 188b88ffeeae958847370dcd1fb28fe708a2aeb7.1703323863.git.lukas () wunner ! de
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Commit 4f2a348aa365 ("arm64: dts: imx8mm-venice-gw73xx: add TPM device")
added a devicetree node for the Trusted Platform Module on certain
Gateworks boards.

The commit only used the generic "tcg,tpm_tis-spi" compatible string,
but public documentation shows that the chip is an ATTPM20P from Atmel
(nowadays Microchip):
https://trac.gateworks.com/wiki/tpm

Add the chip to the supported compatible strings of the TPM TIS SPI
driver.

For reference, a datasheet is available at:
https://ww1.microchip.com/downloads/en/DeviceDoc/ATTPM20P-Trusted-Platform-Module-TPM-2.0-SPI-Interface-Summary-Data-Sheet-DS40002082A.pdf


Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Tim Harvey <tharvey@gateworks.com>
---
 drivers/char/tpm/tpm_tis_spi_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/tpm/tpm_tis_spi_main.c \
b/drivers/char/tpm/tpm_tis_spi_main.c index c5c3197ee29f..7d376a642807 100644
--- a/drivers/char/tpm/tpm_tis_spi_main.c
+++ b/drivers/char/tpm/tpm_tis_spi_main.c
@@ -327,6 +327,7 @@ static const struct spi_device_id tpm_tis_spi_id[] = {
 MODULE_DEVICE_TABLE(spi, tpm_tis_spi_id);
 
 static const struct of_device_id of_tis_spi_match[] __maybe_unused = {
+	{ .compatible = "atmel,attpm20p", .data = tpm_tis_spi_probe },
 	{ .compatible = "st,st33htpm-spi", .data = tpm_tis_spi_probe },
 	{ .compatible = "infineon,slb9670", .data = tpm_tis_spi_probe },
 	{ .compatible = "tcg,tpm_tis-spi", .data = tpm_tis_spi_probe },
-- 
2.40.1


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