Re: [PATCH] brcmfmac: add support for external 32khz clock

[Arend van Spriel <arend.vanspriel@broadcom.com>]

On 11/6/2017 12:27 PM, Simon Shields wrote:
> On Mon, Nov 06, 2017 at 11:59:37AM +0100, Arend van Spriel wrote:
>> On 11/4/2017 2:24 PM, Simon Shields wrote:
>>> Some boards use an external 32khz clock for low-power
>>> mode timing. Make sure the clock is powered on while the chipset
>>> is active.
>>
>> Do you have such a board? With the little documentation I can get my hands
>> on here I wonder whether the clock needs to be enabled before the device is
>> powered. If you have the hardware I would like to check some registers in
>> the device.
>>
>
> Yes. Trats2 (exynos4412-based) has such a setup. The BCM4334 works fine
> with this patch and one more that enables the WL_REG_EN pin when
> brcmfmac is probed.

Ok. So this is exactly the thing I was wondering about. So it makes me 
curious how the WL_REG_EN patch looks like. Can you provide that?

> Without this patch (and only enabling WL_REG_EN), the chip is detected but
> attempting to initialise it fails with a bunch of timeouts.

I would be interested in seeing a detailed log of that. Could you 
provide that? You need to build the driver with CONFIG_BRCMDBG and pass 
module parameter 'debug=0x1416' upon insmod/modprobe.

Regards,
Arend