+ Stefan
On 11/7/2017 2:31 PM, Simon Shields wrote:
Hi Arend,
On Tue, Nov 07, 2017 at 12:09:23PM +0100, Arend van Spriel wrote:
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?
Here[0] is a link to the patch in its current state. Obviously, it's not
ready at all for mainlining :-)
[0]: https://github.com/fourkbomb/linux/commit/436e59e58b44d856c186fc4767560cecbcbc0c59.patch
Thanks. Indeed doing it in module_init of brcmfmac is not going to fly.
Actually the MMC stack has a mechanism to power the SDIO device. This
can be configured through the device tree [1]. I just checked and it
actually includes specifying the external clock as well.
Regards,
Arend
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
