linux-kernel - Re: [PATCH 2/4] mmc: bcm2835: Add new driver for the internal SD controller.

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Message-ID: <CAPDyKFr=x9KkzWxaeTJsJgonGMPY_RV6i2HRLLsqB9zZgYiy5A@mail.gmail.com>
Date:   Mon, 30 Jan 2017 09:22:23 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        linux-rpi-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>, Eric Anholt <eric@...olt.net>,
        linux@...linux.org.uk,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] mmc: bcm2835: Add new driver for the internal SD controller.

On 27 January 2017 at 17:04, Stefan Wahren <stefan.wahren@...e.com> wrote:
> Am 27.01.2017 um 16:27 schrieb Ulf Hansson:
>> On 27 January 2017 at 12:36, Gerd Hoffmann <kraxel@...hat.com> wrote:
>>> From: Eric Anholt <eric@...olt.net>
>>>
>>> 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