Enable TPM infineon

Robotics & Edge Computing IGX Orin Support Forum IGX Developer Kit
1

Hi ,

i follow the topic:

without success.
Why the pinmux on the topic 266719 is not this:
devmem2 0x0243d028 w 0x00000444
devmem2 0x0243d018 w 0x00000444
devmem2 0x0243d040 w 0x00000444
devmem2 0x0243d008 w 0x00000008
devmem2 0x0243d038 w 0x00000448

to enable SPI1 ? Furthermore i’ll set this on runtime and then load the follow module :
tpm_tis_spi tpm_tis_core tpm_tis but the driver replies with:

tpm_tis_spi: probe of spi0.0 failed with error -110.

thanks
Best regards
VP

3

Hi vpellino,

Are you working on IGX developer kit or board kit?

Please share the full dmesg/device tree and also the result of the following command on your board.

$ ls -l /dev/spi*
$ cat /proc/device-tree/bus@0/spi@3210000/status 
$ zcat /proc/config.gz |grep -E "CONFIG_TCG_TIS_CORE|CONFIG_TCG_TIS_SPI"
4

Hi Kevin,

thanks for reply.

cat /proc/device-tree/bus@0/spi@3210000/status 
okay

for spi device i see in the kernel log :
[ 3.153719] spi-tegra114 3210000.spi: Adding to iommu group 1

ls -l /dev/spi*
ls: cannot access ‘/dev/spi*’: No such file or directory

in my configuration there isn’t the file /proc/config.gz but i already compile the features with modules mode for debugging, so i have the tpm_tis_spi.ko, tpm_tis.ko and tpm_tis_core.ko kernel modules.

Thanks
VP

5

So, are you using IGX developer kit or board kit?

Please try to run the following command instead.

$ grep CONFIG_TCG_TIS /boot/config-$(uname -r)

Do you also update the device tree?

6

Hi Kevin,

CONFIG_TCG_TIS_CORE=y
CONFIG_TCG_TIS=y
CONFIG_TCG_TIS_SPI=m
CONFIG_TCG_TIS_SPI_CR50=y
CONFIG_TCG_TIS_SYNQUACER=m
CONFIG_TCG_TIS_I2C_CR50=m
CONFIG_TCG_TIS_I2C_ATMEL=m
CONFIG_TCG_TIS_I2C_INFINEON=m
CONFIG_TCG_TIS_I2C_NUVOTON=m
CONFIG_TCG_TIS_ST33ZP24=m
CONFIG_TCG_TIS_ST33ZP24_I2C=m
CONFIG_TCG_TIS_ST33ZP24_SPI=m

Yes i have update the device tree but i have a question about reset pin :

reset-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(A, 2) GPIO_ACTIVE_LOW>;

i checked on tpm pins strip configured with gpio mode the A,2 but is not connected on pin strip. Is it a problem?

PA.02

echo 350 > export
devmem2 0x02432030 w 1
echo out > PA.02/direction
echo 1 > PA.02/value
echo 0> PA.02/value

after this i didn’t see the gpio movementi on the j43 connector.

Thanks.
VP

7

We just checked the schematic that we use SYS_RESET_N as the reset gpio for TPM so that TPM should get reset during boot up.

I want to confirm that if you haveTPM module on the IGX devkit.
(i.e. do you connect TPM module on the J43?)

8

Hi Kevin,

so the device-tree configuration for TPM is:

spi@3210000 {
		status = "okay";
// I think the first chip select is based on @0 in the device name
//		cs-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Z, 6) GPIO_ACTIVE_LOW>;
		sbl9670@0 {
			compatible = "infineon,slb9670";
			reg = <0x0>;
			spi-max-frequency = <32000000>;
			controller-data {
				nvidia,variable-length-transfer;
				nvidia,rx-clk-tap-delay = <0x31>;
			};
		};
	};

Yes i have TPM module ( Gigabyte TPM GC-TPM2.0 SPI 2.0 ) on J43.

Thank You
VP

9

So, it seems the different model as slb9670…

Please request your vendor for the porting guide for this module.

10

Hi kevin,

the module is this: https://www.gigabyte.com/Motherboard/GC-TPM20-SPI-20#ov

it is slb9670 infineon chip.

VP

11

You may still need to configure CS gpio here.

Plea try if the following device tree working in your case.

	spi@3210000 {
		status = "okay";
		cs-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Z, 6) GPIO_ACTIVE_LOW>;
		sbl9670@0 {
			compatible = "infineon,slb9670";
			spi-max-frequency = <0x1e84800>;
			reg = <0x1>;

			controller-data {
				nvidia,variable-length-transfer;
				nvidia,rx-clk-tap-delay = <0x31>;
			};
		};
	};

Please also confirm that the pinmux for this SPI interface has benn configured correctly for SPI usage.

13

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