Re: [PATCH 1/6] ESDHC: add PIO mode support

[Wolfram Sang <w.sang@pengutronix.de>]

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> For P2020E Rev1.0, the DMA can't work, we need the PIO mode.
> For P2020E, P1010E, MPC8536, we can't use the timeout value calculated by driver, we need the max value.
> For P1010E, the eSDHC controller can't use the max possible frequency(e.g. SDHC 50MHz), so we need one workaround to make the SD work

This is SoC specific, not board specific, so you could check for
"fsl,p2020-esdhc" for example. 1010 and 2020-rev1 would need proper compatibles
as well.

> For eSDHC, after suspending, the power of esdhc controller will shutdown, we need to save the value of some registers before suspending, wich will used to restore the context after resuming.
> For eSDHC, the bit DCR[DMA__AHB2MAG_IRQ_BYPASS] can't be set automatically, so we need to set it manually

If this is true for all revisions (be careful about the imx users), you don't
need properties, but could simply set it.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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