Hello,
I posted this info on IRC, but re-posting here so I don't miss responses.
On an RPi3B+ I have plugged in an Infineon Optiga SLB9670 TPM and a DS3231 RTC.
I have activated the relevant overlays:
# tail -3 /boot/efi/config.txt
dtoverlay=i2c-rtc,ds3231
dtparam=spi=on
dtoverlay=tpm-slb9670
Upon reboot, I can see the RTC comes up and works fine:
# dmesg | grep -i rtc0
[ 7.168331] hctosys: unable to open rtc device (rtc0)
[ 15.831043] rtc-ds1307 1-0068: registered as rtc0
# hwclock --show
2020-05-21 12:41:53.438656+02:00
# timedatectl
Local time: Thu 2020-05-21 12:41:56 CEST
Universal time: Thu 2020-05-21 10:41:56 UTC
RTC time: Thu 2020-05-21 10:41:56
Time zone: Europe/Madrid (CEST, +0200)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
However, the TPM is not detected:
# dmesg | grep -i tpm
[ 7.117891] ima: No TPM chip found, activating TPM-bypass!
I have also tried manually applying the overlay to check if there was a problem with that:
# fdtoverlay -v -i bcm2710-rpi-3-b-plus.dtb -o /var/opt/test.dtb overlays/tpm-slb9670.dtbo
It's probably relevant, but exceeds my understanding of the problem:
[ 33.793093] ------------[ cut here ]------------
[ 33.798151] /soc/spi@7e204000/spidev@0: buggy DT: spidev listed directly in DT
[ 33.803446] WARNING: CPU: 1 PID: 680 at drivers/spi/spidev.c:733 spidev_probe+0x228/0x270 [spidev]
[ 33.813566] Modules linked in: soundcore spidev(+) raspberrypi_hwmon raspberrypi_cpufreq bcm2835_thermal vchiq(C) spi_bcm2835 bcm2835_wdt bcm2835_rng leds_gpio lz4 zram br_netfilter bridge stp llc drm ip_tables uas usb_storage smsc95xx
usbnet mii rfkill rtc_ds1307 mmc_block dwc2 gpio_raspberrypi_exp sdhci_iproc udc_core sdhci_pltfm sdhci i2c_bcm2835 bcm2835 bcm2835_dma crct10dif_ce phy_generic pkcs8_key_parser fuse aes_neon_bs
[ 33.844943] CPU: 1 PID: 680 Comm: systemd-udevd Tainted: G C 5.6.13-300.fc32.aarch64 #1
[ 33.855299] Hardware name: raspberrypi rpi/rpi, BIOS 2019.10 10/09/2019
[ 33.860557] pstate: 40400005 (nZcv daif +PAN -UAO)
[ 33.865805] pc : spidev_probe+0x228/0x270 [spidev]
[ 33.871001] lr : spidev_probe+0x228/0x270 [spidev]
[ 33.876012] sp : ffff800010303a20
[ 33.876021] x29: ffff800010303a20 x28: ffff00003400c080
[ 33.876029] x27: ffffdd00ed0e1ff8 x26: ffffdd00ed0e1fc0
[ 33.890393] x25: 0000000000000020 x24: ffffdd00b29ea380
[ 33.890405] x23: ffffdd00b29ea058 x22: 0000000000000000
[ 33.890412] x21: ffffdd00b29ea038 x20: ffff00002a96d800
[ 33.890419] x19: 0000000000000000 x18: 0000000000000000
[ 33.890425] x17: 0000000000000000 x16: ffffdd00ec4faae4
[ 33.890432] x15: 0000000000000001 x14: 0000000000000a40
[ 33.890439] x13: ffffdd00ed1b0798 x12: 0000000000000001
[ 33.890446] x11: ffff80001110a820 x10: 0000000000000008
[ 33.890452] x9 : ffffdd00ec65a270 x8 : 0000000000000001
[ 33.890459] x7 : 0000000000aaaaaa x6 : 0000000000000001
[ 33.890465] x5 : 0000000000000000 x4 : ffff00003dd2aa10
[ 33.890472] x3 : ffff00003dd38bc8 x2 : ffff00003dd2aa10
[ 33.890478] x1 : ffff22ff504a0000 x0 : 0000000000000042
[ 33.890488] Call trace:
[ 33.890520] spidev_probe+0x228/0x270 [spidev]
[ 33.890537] spi_drv_probe+0x84/0xe0
[ 33.890551] really_probe+0xe4/0x490
[ 33.890559] driver_probe_device+0xe8/0x130
[ 33.890568] device_driver_attach+0xbc/0xc4
[ 33.890576] __driver_attach+0xa4/0x16c
[ 33.890585] bus_for_each_dev+0x64/0xa0
[ 33.890593] driver_attach+0x28/0x30
[ 33.890600] bus_add_driver+0x148/0x240
[ 33.890609] driver_register+0x7c/0x124
[ 33.890617] __spi_register_driver+0x60/0x70
[ 33.890631] spidev_init+0xa8/0x1000 [spidev]
[ 33.890640] do_one_initcall+0x38/0x1f0
[ 33.890652] do_init_module+0x5c/0x290
[ 33.890661] load_module+0x5f4/0x79c
[ 33.890669] __do_sys_init_module+0xd4/0x140
[ 33.890678] __arm64_sys_init_module+0x20/0x30
[ 33.890687] el0_svc_common.constprop.0+0x78/0x180
[ 33.890692] do_el0_svc+0x28/0x90
[ 33.890702] el0_sync_handler+0x15c/0x200
[ 33.890708] el0_sync+0x164/0x180
[ 33.890714] ---[ end trace 660631be62f36086 ]---
Any help or pointers appreciated. Thanks!