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Subject: Re: help with coding a loadable kernel module
From: Daniel Braniss <danny@cs.huji.ac.il>
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Date: Sat, 18 Apr 2015 16:17:34 +0300
Cc: Warner Losh <imp@bsdimp.com>,
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To: Luiz Otavio O Souza <lists.br@gmail.com>
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> On Apr 18, 2015, at 3:51 AM, Luiz Otavio O Souza <lists.br@gmail.com> =
wrote:
>=20
> On 17 April 2015 at 11:08, Daniel Braniss  wrote:
>>=20
>>> On Apr 17, 2015, at 4:42 PM, Warner Losh wrote:
>>>=20
> ...
>>>=20
>>> If you are using FDT in your system, then you=E2=80=99ll put your =
device into the
>>> FDT tree below the spibus to create the device_t node in the tree. =
When
>>> your module is loaded, its probe routine will be called, and you can
>>> match based on the compatible string given in the FDT.
>>>=20
>>=20
>> I was afraid of that :-), this FDT stuff is new to me, and so far I =
was successful
>> in adding a gpio/led, but grep has not found any spibus.
>> any chance for a small template/example ? rpi or bbb would help!
>>=20
>> cheers
>>        danny
>=20
> Hi Daniel,
>=20
> Here is an example of such change for RPi: http://pastie.org/10099132
>=20
> The SPI controller node is defined at
> sys/boot/fdt/dts/arm/bcm2835.dtsi, but usually the local changes go in
> sys/boot/fdt/dts/arm/rpi.dts.
>=20
> Once you boot your system you can check your DTS tree with ofwdump -a
>=20
> Cheers,
> Luiz

pending some cosmetics, the driver gets loaded! and a /dev/rfid0 =
appears!

thanks guys, I still have to figure out some magics, and some SPI  MFRC =
protocol.

as soon as I have a decent working version i=E2=80=99ll submit the =
driver.

thanks again,

	danny