linux-kernel - Re: [PATCH v3 0/13] arm64: allwinner: a64: Enable MMC support

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Message-ID: <20170123105842.37q23ecxecrjr6so@lukather>
Date:   Mon, 23 Jan 2017 11:58:42 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v3 0/13] arm64: allwinner: a64: Enable MMC support

Hi Ulf,

On Mon, Jan 16, 2017 at 05:56:50PM +0100, Maxime Ripard wrote:
> Hi,
> 
> Here is a new attempt at getting the MMC controllers running, following the
> work done by Andre.
> 
> This has been tested on a board with one SDIO device (a Marvell WiFi chip)
> and a Kingston eMMC with 1.8V IOs.
> 
> For SDIO, the HS DDR mode works just fine. That serie also enables the
> SDR104 mode to work on the devices that are capable of this.
> 
> For the eMMC, HS200 with the voltage switch works. HS400 doesn't at the
> moment, but since it's significantly more complex, and at the same time
> Allwinner recommends to limit its frequency to 100MHz, this doesn't have
> any benefits. If there's any at some point, this can be added later.

Unless you have objections, I'd really like this to be in
4.11. There's a bunch of things where I'm not entirely sure
(especially the clock gating part), it would be great if you could
have a look.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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