[Solved] Olinuxino A20 and trouble in enabling SPI

Tar · November 09, 2014, 02:51:12 PM

Hi,

i just try to put things together. I`d like to have a kernel with Mali, LCD, Touchscreen support and SPI on UEXT. Full duplex would be nice but is not necessary in the first step.

So in addition to compiling a new kernel like in https://www.olimex.com/forum/index.php?topic=3857.0 i included the sun7i-spi.o module from the topic "Full Duplex SPI" https://www.olimex.com/forum/index.php?topic=3809.0 and added this module and spidev to my kernel statically.

Finally i adopted my script.bin and added the [spi_boardX], [spiX_para] and [spi_devices] sections.

In /sys/class/ i see 2 directories spidev and spi_master, but they are empty. So no devices under dev and, dmesg | grep spi is empty. Where should i look further?

Kind regards,

ingo

Edit: I missed the include of "obj-$(CONFIG_SPI_SUN7I) += spi-sun7i.o" into the appropriate Makefile

Cosik · November 13, 2014, 10:37:45 PM

Hi,

Did you already solved your problem?

Tar · November 15, 2014, 12:54:04 PM

Quote from: Cosik on November 13, 2014, 10:37:45 PM
Hi,

Did you already solved your problem?

Hi Cosik,

unfortunately not. I am not sure, what has to be changed. On the one hand, the module is included statically into the kernel, but i don`t see anything about initialisation. On the other hand, the hardware has been enabled in the fex/script.bin. Could it be a problem of an old bootloader, that does not parse the script.bin correctly? This would be my next investigation.
I also have the possibility to debug anything via serial console, if it helps.

JohnS · November 15, 2014, 02:50:32 PM

I'd look at kernel (driver) issues, not bootloader.

John

Cosik · November 15, 2014, 03:07:55 PM

Hi,

1. Pleas show us what spidev you have in /dev/
2. Show yours fex script.

Tar · November 15, 2014, 11:34:11 PM

Hi,

here the relevant parts of my script.fex

Code Select


[spi_board0]
modalias = "spidev"
max_speed_hz = 12000000
bus_num = 0
chip_select = 0
mode = 0
full_duplex = 1
manual_cs = 0

[spi_board1]
modalias = "spidev"
max_speed_hz = 12000000
bus_num = 1
chip_select = 0
mode = 0
full_duplex = 1
manual_cs = 0

[spi_board2]
modalias = "spidev"
max_speed_hz = 12000000
bus_num = 2
chip_select = 0
mode = 0
full_duplex = 1
manual_cs = 0
[spi_board3]
modalias = "spidev"
max_speed_hz = 12000000
bus_num = 3
chip_select = 0
mode = 0
full_duplex = 1
manual_cs = 0

[spi0_para]
spi_used = 1
spi_cs_bitmap = 1
spi_cs0 = port:PI10<2><default><default><default>
spi_cs1 = port:PI14<2><default><default><default>
spi_sclk = port:PI11<2><default><default><default>
spi_mosi = port:PI12<2><default><default><default>
spi_miso = port:PI13<2><default><default><default>

[spi1_para]
spi_used = 1
spi_cs_bitmap = 1
spi_cs0 = port:PI16<3><default><default><default>
spi_sclk = port:PI17<3><default><default><default>
spi_mosi = port:PI18<3><default><default><default>
spi_miso = port:PI19<3><default><default><default>

[spi2_para]
spi_used = 1
spi_cs_bitmap = 1
spi_cs0 = port:PC19<3><default><default><default>
spi_sclk = port:PC20<3><default><default><default>
spi_mosi = port:PC21<3><default><default><default>
spi_miso = port:PC22<3><default><default><default>

[spi3_para]
spi_used = 1
spi_cs_bitmap = 1
spi_cs0 = port:PA05<3><default><default><default>
spi_cs1 = port:PA09<3><default><default><default>
spi_sclk = port:PA06<3><default><default><default>
spi_mosi = port:PA07<3><default><default><default>
spi_miso = port:PA08<3><default><default><default>

[spi_devices]
spi_dev_num = 4

dmesg | grep spi does not show anything

Code Select


root@anor:/sys/class# ls -d spi*
spidev/     spi_master/ 
root@anor:/sys/class# ls -la spi*
spidev:
total 0
drwxr-xr-x  2 root root 0 May 16 00:18 .
drwxr-xr-x 53 root root 0 May 16 00:16 ..

spi_master:
total 0
drwxr-xr-x  2 root root 0 May 16 00:18 .
drwxr-xr-x 53 root root 0 May 16 00:16 ..

Cosik · November 16, 2014, 11:14:41 AM

please also list /dev directory

Code Select

ls -la /dev/ | grep spi

And show kernel version

Code Select

uname -a

In my tutorial I've made a mistake, I put wrong git link to kernel.

Please also show lsmod and list of modules of your current kernel.

Tar · November 16, 2014, 01:32:02 PM

ok, here we are:

Code Select


root@anor:~# ls -la /dev/ | grep spi
root@anor:~#

Code Select


root@anor:~# zgrep -i spi /proc/config.gz
CONFIG_RWSEM_GENERIC_SPINLOCK=y
# CONFIG_INLINE_SPIN_TRYLOCK is not set
# CONFIG_INLINE_SPIN_TRYLOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK is not set
# CONFIG_INLINE_SPIN_LOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK_IRQ is not set
# CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
CONFIG_UNINLINE_SPIN_UNLOCK=y
# CONFIG_INLINE_SPIN_UNLOCK_BH is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQ is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set
CONFIG_MUTEX_SPIN_ON_OWNER=y
CONFIG_REGMAP_SPI=y
CONFIG_SENSORS_LIS3_SPI=m
# CONFIG_SCSI_SPI_ATTRS is not set
CONFIG_LIBERTAS_SPI=m
CONFIG_TOUCHSCREEN_AD7879_SPI=m
CONFIG_TOUCHSCREEN_CYTTSP_SPI=m
CONFIG_INPUT_AD714X_SPI=m
CONFIG_INPUT_ADXL34X_SPI=m
CONFIG_SPI=y
# CONFIG_SPI_DEBUG is not set
CONFIG_SPI_MASTER=y
# SPI Master Controller Drivers
# CONFIG_SPI_ALTERA is not set
# CONFIG_SPI_BITBANG is not set
# CONFIG_SPI_BUTTERFLY is not set
# CONFIG_SPI_GPIO is not set
# CONFIG_SPI_LM70_LLP is not set
# CONFIG_SPI_OC_TINY is not set
# CONFIG_SPI_PL022 is not set
# CONFIG_SPI_PXA2XX_PCI is not set
CONFIG_SPI_SUN7I=y
CONFIG_SUN7I_SPI_NDMA=y
# CONFIG_SPI_XILINX is not set
# CONFIG_SPI_DESIGNWARE is not set
# SPI Protocol Masters
CONFIG_SPI_SPIDEV=y
# CONFIG_SPI_TLE62X0 is not set
# SPI GPIO expanders:
# CONFIG_MFD_TPS65912_SPI is not set
# CONFIG_MFD_DA9052_SPI is not set
# CONFIG_MFD_WM831X_SPI is not set
CONFIG_SND_SPI=y
CONFIG_SND_SOC_I2C_AND_SPI=y
# SPI RTC drivers
# CONFIG_AD5624R_SPI is not set
# Hardware Spinlock drivers
# CONFIG_DEBUG_SPINLOCK is not set

Code Select


root@anor:~# lsmod
Module                  Size  Used by
disp_ump                1037  0 
mali_drm                3160  1 
drm                   228218  2 mali_drm
mali                  142674  0 
cpufreq_powersave       1377  0 
cpufreq_conservative     6706  0 
cpufreq_stats           6419  0 
cpufreq_userspace       3578  0 
nfsd                   96610  0 
exportfs                3844  1 nfsd
sunxi_cedar_mod        10579  0 
ump                    55044  4 mali,disp_ump
lcd                     4206  0 
root@anor:~# uname -a
Linux anor 3.4.103+ #3 SMP PREEMPT Sun Nov 9 10:46:21 CET 2014 armv7l GNU/Linux
root@anor:~#

could my LCD-OLinuXino-4.3TS (4.3" LCD with Touchscreen) be a problem?
If it helps, i also may compile CONFIG_SPI_DEBUG into the kernel, but as far as i see the code, it only would add additional info. Main parts, like initialisation should print something either. But i`ll give it a try

Cosik · November 16, 2014, 02:32:17 PM

Hi,

Ok, please try to recompile kernel with enable DEBUG. Here is my SPI kernel config.

Code Select

CONFIG_RWSEM_GENERIC_SPINLOCK=y
# CONFIG_INLINE_SPIN_TRYLOCK is not set
# CONFIG_INLINE_SPIN_TRYLOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK is not set
# CONFIG_INLINE_SPIN_LOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK_IRQ is not set
# CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
CONFIG_UNINLINE_SPIN_UNLOCK=y
# CONFIG_INLINE_SPIN_UNLOCK_BH is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQ is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set
CONFIG_MUTEX_SPIN_ON_OWNER=y
CONFIG_REGMAP_SPI=y
CONFIG_SENSORS_LIS3_SPI=m
# CONFIG_SCSI_SPI_ATTRS is not set
CONFIG_LIBERTAS_SPI=m
CONFIG_P54_SPI=m
CONFIG_P54_SPI_DEFAULT_EEPROM=y
CONFIG_WL1251_SPI=m
CONFIG_WL12XX_SPI=m
CONFIG_TOUCHSCREEN_AD7879_SPI=m
CONFIG_TOUCHSCREEN_CYTTSP_SPI=m
CONFIG_INPUT_AD714X_SPI=m
CONFIG_INPUT_ADXL34X_SPI=m
CONFIG_SPI=y
CONFIG_SPI_DEBUG=y
CONFIG_SPI_MASTER=y
# SPI Master Controller Drivers
# CONFIG_SPI_ALTERA is not set
# CONFIG_SPI_BITBANG is not set
# CONFIG_SPI_BUTTERFLY is not set
# CONFIG_SPI_GPIO is not set
# CONFIG_SPI_LM70_LLP is not set
# CONFIG_SPI_OC_TINY is not set
# CONFIG_SPI_PL022 is not set
# CONFIG_SPI_PXA2XX_PCI is not set
CONFIG_SPI_SUN7I=y
CONFIG_SUN7I_SPI_NDMA=y
# CONFIG_SPI_XILINX is not set
# CONFIG_SPI_DESIGNWARE is not set
# SPI Protocol Masters
CONFIG_SPI_SPIDEV=y
# CONFIG_SPI_TLE62X0 is not set
# SPI GPIO expanders:
# CONFIG_MFD_TPS65912_SPI is not set
# CONFIG_MFD_DA9052_SPI is not set
# CONFIG_MFD_WM831X_SPI is not set
CONFIG_SND_SPI=y
CONFIG_SND_SOC_I2C_AND_SPI=y
# SPI RTC drivers
# CONFIG_AD5624R_SPI is not set
# Hardware Spinlock drivers
# CONFIG_DEBUG_SPINLOCK is not set

Also please try to unplug each spi devices from yous board and then run it and check spi.

Tar · November 16, 2014, 06:46:42 PM

Hi Cosik,

i have to apologise, somehow the include into the Makefile got lost, so the code was compiled but not included. I just got my devices!

Many thanks :-)

Cosik · November 16, 2014, 07:54:15 PM

Hi Tar,

No problem, have a fun with working SPI

AnkyB · April 11, 2017, 09:52:01 AM

Hi,

I am also trying to use SPI on my A20Lime2-4gb( with latest debian8 jessie image). But having trouble to get it working. I think there is issue related to spi drivers but don't know how to resolve it. There is no file like spidevx.x is available in /dev directory. Under sys/bus/spi I see 2 directories drivers and devices, both are empty and /sys/class contains only spi_master directory, that too empty. I have enabled both spi ports in script.fex. my kernel version is Linux A20-OlinuXino 3.4.103-00033-g9alcd03-dirty SMP PREEMPT wed Oct 12 16:41:17 EEST 2016 armv71 GNU/Linux.
can you help me, how can I solve this?