I have a Hikey LeMaker 620 on which I am trying to enable I2C as currently I am not getting /dev/i2c* nodes.
I am using the docs here : https://github.com/96boards/documentation/blob/master/consumer/hikey/hikey620/build/linux-kernel.md
I see that I2C_DESIGNWARE_PLATFORM I2C_CHARDEV
are already enabled, still I do not see anything in /sys/bus/i2c/devices/ and as a result my i2cdetect fails saying “/dev/i2c/0 : No such file or directory”
Are there any kernel configs which I am missing?
EDIT
Here are the dmesg logs
/ # dmesg | grep i2c
[ 0.251154] i2c-core: driver [dummy] registered
[ 0.284233] i2c-core: driver [pca953x] registered
[ 0.286078] i2c-core: driver [sec_pmic] registered
[ 0.287137] i2c_designware f7100000.i2c: could not find pctldev for node /soc/pinmux@f7010000/i2c0_pmx_func, deferring probe
[ 0.287167] i2c_designware f7101000.i2c: could not find pctldev for node /soc/pinmux@f7010000/i2c1_pmx_func, deferring probe
[ 0.287188] i2c_designware f7102000.i2c: could not find pctldev for node /soc/pinmux@f7010000/i2c2_pmx_func, deferring probe
[ 0.323590] i2c-core: driver [cs2000-cp] registered
[ 0.328647] i2c-core: driver [fan53555-regulator] registered
[ 0.340913] i2c-core: driver [cros-ec-i2c] registered
[ 0.341005] i2c-core: driver [max77620] registered
[ 0.341054] i2c-core: driver [rk808] registered
[ 0.351637] i2c-core: driver [usb3503] registered
[ 0.353610] i2c-core: driver [rtc-ds3232] registered
[ 0.354842] i2c /dev entries driver
[ 0.355782] i2c-core: driver [pca954x] registered
[ 0.356294] i2c-core: driver [bq27xxx-battery] registered
[ 0.501408] i2c-core: driver [hmc5843] registered
[ 2.209817] i2c_designware f7100000.i2c: Unknown Synopsys component type: 0x00000000
[ 2.218809] i2c_designware f7101000.i2c: Unknown Synopsys component type: 0x00000000
[ 2.227621] i2c_designware f7102000.i2c: Unknown Synopsys component type: 0x00000000
This turned out to be a bug. More discussion here : https://discuss.96boards.org/t/kernel-configuration-for-enabling-i2c-on-hikey-lemaker-620/7517