On 27 January 2017 at 17:04, Stefan Wahren [off-list ref] wrote:

Am 27.01.2017 um 16:27 schrieb Ulf Hansson:

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On 27 January 2017 at 12:36, Gerd Hoffmann [off-list ref] wrote:

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From: Eric Anholt <redacted>

The 2835 has two SD controllers:  The Arasan SDHCI controller (supported
by the iproc driver) and a custom SD controller.  This patch adds a
driver for the custom SD controller.

The custom controller runs faster, and driving the sdcard with the
custom controller also allows to drive the rpi3 wifi with the iproc
driver.

I don't understand this relationship. Is this somewhat configurable in runtime?

The configuration is done by devicetree via pin muxing. AFAIK both SD
controller are available on the same pins (2 pin groups = pin 22 to 27 +
pin 48 to 53). So it's possible to use both SD controllers at the same
time with different pin groups. This is necessary to use Wifi via SDIO
on the RPi 3 while the other controller handles SD card with the rootfs.

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Is the WIFI module a removable SDIO card?

No

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 So you can decide which
controller that is best suited to use?

Yes, but it requires also both drivers.

Okay, thanks for clarifying - I will go on with the review.

If a re-spin of the series is needed, please make sure to update the
coverletter with some information from above, so I don't get confused
again. :-)

Kind regards
Uffe