Where to power on the wifi device before loading the driver.

On 06/14/2012 06:12 AM, Mark Brown wrote:

On Thu, Jun 14, 2012 at 08:31:20AM +0200, Thierry Reding wrote:

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On Wed, Jun 13, 2012 at 03:17:06PM -0600, Stephen Warren wrote:

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The core of the issue is that:

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* Tegra30 support is via device tree. * We have an SDIO bus,
and the WiFi device attached to that bus is enumerable. * Since
the WiFi device is enumerable, no node exists in the DT to 
represent it. * However, the driver for the WiFi device needs
certain information, such as the reset GPIO ID and perhaps
power GPIO.

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PCI devices are also enumerable and yet they can be matched up
with nodes in the device tree. Perhaps something similar could be
added for the SDIO bus?

This seems to make the most sense - pushing this through the
regulator API is just a bodge.

Yes, that seems reasonable.

Presumably the power GPIO should be a fixed regulator though, since it
is a power control not just a plain old GPIO? That said, the current
driver apparently deals with this as a GPIO already.

The reset GPIO can separately/directly controlled by the WiFi driver
though.