[PATCH v2 1/2] ARM: vexpress: Enable regulator framework when MMCI is in use

[Russell King - ARM Linux]

On Mon, Mar 18, 2013 at 06:00:55PM +0000, Pawel Moll wrote:
> The MMCI driver, when used with a Device Tree described device, relies
> on the "vmmc" voltage regulator supply to set the OCR register voltage bits,
> using MMC core's mmc_regulator_get_supply() function.
> 
> Without the regulator framework present there are no valid operating
> voltages reported and the device initialisation fails:
> 
> mmci-pl18x 1c050000.mmci: mmc0: PL180 manf 41 rev0 at 0x1c050000 irq 41,42 (pio)
> mmc0: host doesn't support card's voltages
> mmc0: error -22 whilst initialising MMC card

Okay, this isn't going to work, because this means it's broken on a whole
load of platforms.  What it means is that this commit:

commit 599c1d5c750ddf528c7c6d3cdc466708f0502e66
Author: Ulf Hansson <ulf.hansson at linaro.org>
Date:   Mon Jan 7 16:22:50 2013 +0100

    ARM: 7620/1: mmc: mmci: Convert to use mmc_regulator_get_supply
    
    By using the mmc_regulator_get_supply API we are able to do some
    cleanups of the regulator code. Additionally let the regulator
    API handle the error printing.
    
    Cc: Chris Ball <cjb at laptop.org>
    Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
    Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>

is actually wrong and probably needs reverting.