How to enable SPI

Hi Jonny

To enable SPI in Linux, you can follow the manual in "R-Car S4 SDK Linux PKG with GCC compiler v3.16.2" package. Download it from: https://www.renesas.com/us/en/products/automotive-products/automotive-system-chips-socs/r-car-s4-automotive-system-chip-soc-car-servercommunication-gateway

I created a patch to enable and give control to driver domain. You can refer to it.

0001-ca55-Enable-SPI-for-DomD.patch

Best Regards,

Duy Dang

Hi,

    Thanks!
    I will try it.

Best Regards,

Johnny

Hi,

   I can't get into DomD.

  Please refer to following log.

(XEN) GICv3: Mapping ITS translation register to d1:addr=0x00000000f1050000 size=0x0000000000010000
(XEN) IRQ 262 is already used by domain 0
(XEN) gnttab_mark_dirty not implemented yet
[FAILED] Failed to start DomD.
See 'systemctl status domd.service' for details.
[ OK ] Reached target Multi-User System.
[ OK ] Started Reboot system by guest domain request.
Starting Update UTMP about System Runlevel Changes...
[ OK ] Started Update UTMP about System Runlevel Changes.
[ 5.984557] random: crng init done
[ 5.984952] random: 7 urandom warning(s) missed due to ratelimiting
[ OK ] Started Load/Save Random Seed.

Poky (Yocto Project Reference Distro) 3.1.16 generic-armv8-xt-dom0 hvc0

generic-armv8-xt-dom0 login: root
root@generic-armv8-xt-dom0:~# xl console DomD
DomD is an invalid domain identifier (rc=-6)
root@generic-armv8-xt-dom0:~#

Best Regards,

Johnny

Hi Jonny,

Which S4 board are you using (Spider or S4 Starter Kit)?

Did you make any modification before?

Best Regards,

Duy Dang

Hi,

   Sorry, I do something wrong.

   I can get into DomD.

   Thanks!

Best Regards,

Johnny

Hi,

    Can you give an example to contorl driver or send any signal through SPI?

    Thanks!

Best Regards,

Johnny

Hi,

   We just want to test SPI interface. So after I patch successfully, how can I send signal to test SPI interface like scan SPI.

Best Regards,

Johnny

Hi,

You can use spidev-test tool to check SPI interface.

Modify this file application_cpu/aos-rcar-gen4-patch.yaml

--- a/application_cpu/aos-rcar-gen4-patch.yaml
+++ b/application_cpu/aos-rcar-gen4-patch.yaml
@@ -32,6 +32,7 @@
                 - [IMAGE_INSTALL_append, " rps-setup"]
                 - [IMAGE_INSTALL_append, " hw-routing-script"]
                 - [IMAGE_INSTALL_append, " pktgen-script"]
+                - [IMAGE_INSTALL_append, " spidev-test"]
                 - [USE_UFS, "%{USE_UFS}"]
               layers:
                 - "%{META_WB_LAYER_PATH}/meta-rcar-whitebox/meta-rcar-common"

Rebuild the image:

./build_xenhypervisor.sh <board>

Hi 

   Is G4MH need to modified or enable anything?

Best Regards,

Johnny

Hi,

No. You don't need to modify in G4MH

Best Regards,

Duy Dang