[OpenWrt-Devel] i2c device not in /dev

[Baptiste Clenet]

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
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-- 
Baptiste
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