Dear Geert Uytterhoeven,
Thank you very much for your support.
Today I tested the CAN with R-CAR M2 (Koelsch board) because r8a7791 is
listed in CAN driver compatibility list .
' dmesg | grep -i can ' shows
vcan: Virtual CAN interface driver
slcan: serial line CAN interface driver
slcan: 10 dynamic interface channels.
CAN device driver interface
rcar_can e6e80000.can: device registered (reg_base=e78f2000, irq=218)
can: controller area network core (rev 20120528 abi 9)
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
I can't see any pfc error/warning message which is happened in the case
of R-CAR E2 (ALT board), but couldn't get the expected result in R-CAR
M2 Koelsch board also.
For testing purpose , I checked the result of Virtual CAN (vcan) , it is
working fine.
Then my question is ,
Is it not possible to test native (real hardware) CAN interface like
can0 in Koelsch or ALT board ?
Regards
RKP
On 8/30/2016 6:18 PM, Geert Uytterhoeven wrote:
On Tue, Aug 30, 2016 at 1:36 PM, Roopesh K P <roopeshkp@xxxxxxxxxxxxxxx> wrote:
I'm trying to use native (real hardware) interfaces like can0 in R-CAR E2
based board (RTP0RC7794SEB00011S - ALT board). I am able to configure the
CAN interfaces (can0 and can1). While testing, CAN driver seems to be able
to send the CAN packets but not able to receive CAN packets from bus. Please
help me to fix this issue.
I had made the following changes.
1) Built the AGL kernel (3.10.31-ltsi) with CAN (SOCKET CAN) support by
changing the configuration using menuconfig utility.
2) Added can0 and can1 pins details at the end of 'pfc' block in
r8a7794-silk.dts file. Also added can0 and can1 block in the same file.
3) Modified the r8a7794.dtsi file and add can0 and can1 interface support.
Also modified 'mstp9_clks' section to add can0 and can1 clock.
4) Added 'R8A7794_CLK_RCAN1' and 'R8A7794_CLK_RCAN0' clocks macros in
'includes/dt-bindings/clock/r8a7794-clock.h' file
5) Added R-CAR E2 in compatibility list in 'drivers/net/can/rcar_can.c' file
At first sight, all of these look OK.
After booting 'dmesg | grep -i can' shows
pinmux core: sh-pfc does not support function can0
sh-pfc e6060000.pfc: invalid function can0 in map table
pinmux core: sh-pfc does not support function can1
sh-pfc e6060000.pfc: invalid function can1 in map table
The pfc-r8a7794.c driver lacks support for CAN functions.
1) I couldn't see r8a7794 in the CAN compatibility list. R-CAR CAN driver is
able to supports R-CAR E2 CAN interface ?
I assume it can, but no one has added the compatible value to the driver yet.
2) Is there any additional modifications are needed in any of the driver
source like pfc for supporting receive functionality (Rx)?
3) Is there any errors in the modifications I have done ? Showing the
following warnings/error while booting
a) pinmux core: sh-pfc does not support function can0
b) sh-pfc e6060000.pfc: invalid function can0 in map table
Indeed, CAN support should be added to the pfc-r8a7794.c driver.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
.
