Hi all. I spend some time to debug an issue that our touch driver does not get loaded even if defined in devicetree. I enabled core debug and added a printk to kernel/kmod.c [ 0.223468] usbcore: registered new interface driver usbfs [ 0.223558] usbcore: registered new interface driver hub [ 0.223698] usbcore: registered new device driver usb [ 0.224557] i2c i2c-1: adapter [21a4000.i2c] registered [ 0.224583] i2c i2c-1: of_i2c: walking child nodes [ 0.224596] i2c i2c-1: of_i2c: register /soc/aips-bus@02100000/i2c@021a4000/ar1021@4d [ 0.224628] __request_module: i2c:ar1021_i2c [ 0.225144] i2c 1-004d: uevent [ 0.225183] i2c i2c-1: client [ar1021_i2c] registered with bus id 1-004d [ 0.225198] i2c i2c-1: of_i2c: register /soc/aips-bus@02100000/i2c@021a4000/pca9555@20 [ 0.225213] __request_module: i2c:pca9555 [ 0.225519] i2c 1-0010: uevent [ 0.225577] pca953x 1-0010: probe [ 0.225602] i2c i2c-1: master_xfer[0] W, addr=0x10, len=1 Now it gets interesting :) root@OT:/# modinfo ar1021_i2c filename: /lib/modules/3.14.18/kernel/drivers/input/touchscreen/ar1021_i2c.ko license: GPL description: Microchip AR1021 I2C Driver author: Christian Gmeiner <christian.gmeiner@xxxxxxxxx> alias: of:N*T*Cmicrochip,ar1021_i2c* alias: i2c:MICROCHIP_AR1021_I2C depends: intree: Y vermagic: 3.14.18 SMP preempt mod_unload ARMv7 p2v8 So the ar1021_i2c driver is build as kernel module and at this point it is not possible to modprobe/request that module as the RFS is not yet mounted and the initramfs does not contain this driver. Should the i2c-core not load the requested driver in an deferred way? Any opinions? By the way the ar1021_i2c driver can be found here: https://www.mail-archive.com/linux-input@xxxxxxxxxxxxxxx/msg08071.html Greets -- Christian Gmeiner, MSc https://soundcloud.com/christian-gmeiner -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
