On 27 January 2017 at 17:04, Stefan Wahren <stefan.wahren@xxxxxxxx> wrote: > Am 27.01.2017 um 16:27 schrieb Ulf Hansson: >> On 27 January 2017 at 12:36, Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote: >>> From: Eric Anholt <eric@xxxxxxxxxx> >>> >>> 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. > >> >> Is the WIFI module a removable SDIO card? > > No > >> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
