[OpenWrt-Devel] i2c device not in /dev

[Baptiste Clenet]

2015-09-15 13:57 GMT+02:00 Baptiste Clenet <bapclenet at gmail.com>:
> 2015-09-14 20:17 GMT+02:00 John Crispin <blogic at openwrt.org>:
>>
>>
>> On 14/09/2015 20:09, Daniel Golle wrote:
>>> On Mon, Sep 14, 2015 at 07:47:08PM +0200, John Crispin wrote:
>>>> On 14/09/2015 19:28, Baptiste Clenet wrote:
>>>>> Hi,
>>>>>
>>>>> I'm using a MT7628 chip and I try to implement an I2C device which
>>>>> will use i2c-ralink adapter. I registered my i2c device with
>>>>> module_i2c_driver(i2c_device_driver);
>>>>>
>>>>> I can see it on my bus:
>>>>> ./sys/bus/i2c/drivers/i2c_device_driver
>>>>> But it doesn't appear in /dev.
>>>>>
>>>>> What am I doing wrong?
>>>>>
>>>>> Regards,
>>>>>
>>>>
>>>> you are missing CONFIG_I2C_CHARDEV in the kernel config
>>>
>>> or maybe i2c-dev isn't loaded? try
>>> modprobe i2c-dev
>>>
>>
>> i2c-dev is part of i2c-core if that symbol is selected. i2c-core uses
>> AutoLoad and not AutoProbe so it should always load.
>
> Thnaks for the answer.
>
> i2c-dev and i2c-core are loaded as well as i2c-ralink and my i2c
> driver. How to add CONFIG_I2C_CHARDEV? I added it in
> /target/linux/ramips config file of my board but it hasn't changed
> anything. How may I check that the config has really been added?
>
> By the way, is there a similar CONFIG for SPI, like CONFIG_SPI_CHARDEV ?
>
>>
>>         John
>> _______________________________________________
>> openwrt-devel mailing list
>> openwrt-devel at lists.openwrt.org
>> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>
>
>
> --
> Baptiste


Actually, here is my configuration:
I've got my driver in /sys/bus/i2c/drivers
Nothing in /sys/bus/i2c/devices
Nothing in /sys/class/i2c-dev as well.

Concerning CONFIG_I2C_CHARDEV, it seems that it is automatically added
with i2c-core so it should be compiled in my distrib. (Do you know how
I can check?)

Cheers,


-- 
Baptiste
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