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

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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.

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

> Regards,
> Arend

Cheers,
Simon
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