Linux/WL1835MOD: Wl18xx linux kernel driver init logic

minghua

Part Number: WL1835MOD
Other Parts Discussed in Thread: WL1835

Tool/software: Linux

I'm porting the wl18xx driver from the BeagleBoneBlack Wireless to another platform. The build steps I'm following is from the eewiki here: https://eewiki.net/display/linuxonarm/BeagleBone+Black . The source code kernel version is 4.9.37-ti-r47.

Everything works on BBBW board. When I tracked the code logic, I can see the function wl18xx_driver_init() is calling platform driver matching/attaching functions to associate the driver to the device. However, that function wl18xx_driver_init() is not called in the build from our source code.

over 7 years ago

0 S over 7 years ago

TI__Mastermind 35795 points

Hi,
Have you modified your dts file to include wilink related configuration ?

Thanks
Saurabh

0 minghua over 7 years ago in reply to S

Intellectual 495 points

I can't see the platform device "wl18xx" in the sample dts. There is only a "wlcore" that is suggested by TI. The driver should be matched by the "wl18xx" device.

0 minghua over 7 years ago in reply to minghua

Intellectual 495 points

In terms of dts, I'm following instructions from the integration guild processors.wiki.ti.com/.../WL18xx_Platform_Integration_Guide.

Is there anything not on the page but also need to be added to dts?

0 S over 7 years ago in reply to minghua

TI__Mastermind 35795 points

Hi,
pls refer to wilink8 related dtsi : github.com/.../am335x-boneblack-wl1835.dtsi
this file is included by most of the platform dts files. make sure this is modified as per your platform

Saurabh

0 S over 7 years ago in reply to S

TI__Mastermind 35795 points

Hi , Between different boards, normally all you need to do is modify the dts file as per your board schematics. Let us know if you need further assistance with this. Thanks

0 minghua over 7 years ago in reply to S

Intellectual 495 points

Hi, Saurabh,

Thanks for pointing me to the authentic dts file. There are many conflicting information on the web, it was hard to know which one is the authority.

Though, the dts does not contains the "wl18xx" device. After some tracking with the source code and logging messages, this looks to be what happens to get the initialization sequence complete:

The "wlcore_sdio" module is compatible with "ti,wl1835". That causes the module is loaded because the dts contains the module "wlcore" that is compatible to the "ti,wl1835". When the probe function of "wlcore_sdio" detects a wl1835 chip, it would insert the "wl18xx" platform device. Once the "wl18xx" device is inserted, it will take care of the rest of the initialization logic. Does this look right?

Thanks.

0 S over 7 years ago in reply to minghua

TI__Mastermind 35795 points

Hi,
I am glad we could help. Yes, the logic is correct .

Thanks
Saurabh

0 minghua over 7 years ago in reply to S

Intellectual 495 points

Thank you!

0 S over 7 years ago in reply to minghua

TI__Mastermind 35795 points

You are welcome. I will close this thread. Please open a new thread in case you have any further questions.

Thanks
Saurabh

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Linux/WL1835MOD: Wl18xx linux kernel driver init logic