[bpi-r2pro/linux 6.1] how to populate spi devices in /dev

[jssyan]

Would you please show some samples about how to populate spi devices under /dev for a bpi-r2-pro board?

Here is what I have done (but failed)

changed status from "disabled" to "okay" in rk3568-bpi-r2-pro.dts spi3

&spi3 {
   /* pin 19 (MO) + 21 (MI) + 23 (CK) of header con2 */
   /* shared with pwm12/14/15 and uart9 */
   pinctrl-0 = <&spi3m1_pins>;
   status = "okay";
};

compile & install & reboot

# lsmod
Module                  Size  Used by    Not tainted
spidev                 24576  0
nf_nat_ftp             20480  0
nf_conntrack_ftp       28672  1 nf_nat_ftp
ipt_REJECT             16384  1
nf_reject_ipv4         16384  1 ipt_REJECT
nf_log_syslog          24576  7
xt_LOG                 20480  7
xt_mark                16384  1
xt_conntrack           16384  3
iptable_filter         16384  1
iptable_mangle         16384  1
iptable_nat            16384  1
nf_nat                 65536  2 nf_nat_ftp,iptable_nat
nf_conntrack          155648  4 nf_nat_ftp,nf_conntrack_ftp,xt_conntrack,nf_nat
nf_defrag_ipv4         16384  1 nf_conntrack
nf_defrag_ipv6         24576  1 nf_conntrack
ip_tables              32768  3 iptable_filter,iptable_mangle,iptable_nat
x_tables               40960  8 ipt_REJECT,xt_LOG,xt_mark,xt_conntrack,iptable_filter,iptable_mangle,iptable_nat,ip_tables
polyval_ce             16384  0
polyval_generic        16384  1 polyval_ce
rockchip_rng           20480  0
rtc_hym8563            20480  1
spi_rockchip           20480  0
uio_pdrv_genirq        20480  0
uio                    20480  1 uio_pdrv_genirq
ath10k_pci             45056  0
ath10k_core           438272  1 ath10k_pci
mac80211              794624  1 ath10k_core
ath                    32768  1 ath10k_core
cfg80211              712704  3 ath10k_core,mac80211,ath

# ls -R /dev | grep spi
（nothing）

# find /sys/ -name spi3
/sys/class/spi_master/spi3
/sys/devices/platform/fe640000.spi/spi_master/spi3
/sys/firmware/devicetree/base/pinctrl/spi3
/sys/firmware/devicetree/base/aliases/spi3
/sys/firmware/devicetree/base/__symbols__/spi3

no spidevB.C device found under /dev

# cat /etc/mdev.conf
$MODALIAS=.* 0:0 660 @/sbin/modprobe -b "$MODALIAS"

null            0:0 666
zero            0:0 666
urandom         0:0 444

kmem            0:9 000
mem             0:9 640
port            0:9 640

console         0:5 600
ptmx            0:5 660
tty[0-9]*       0:5 660
ttyS[0-9]*      0:20 640

fd[0-9]*        0:11 660
sd[a-z]*        0:6 660
hd[a-z]*        0:6 660

rtc0            0:0 600 @/bin/ln -sf $MDEV rtc

usbdev.*          0:0 0660  */etc/mdev/usbdev.sh
SUBSYSTEM=usb;.*  0:0 0660  */etc/mdev/usbdev.sh

SUBSYSTEM=drivers;.* 0:0 0660  */etc/mdev/drivers.sh

[frank-w]

Hi sorry,missed this issue somehow. Have not done much with spi,but afaik you have to add your device (with the right compatible) to devicetree. Afair the spidev needs a special compatible as the spidev default compatible was dropped from mainline some time ago...you have to look into spidev driver which compatibles it supports