On Sep 17, 2012, at 7:36 AM, Chris Ball wrote:
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Hi,

On Thu, Sep 13 2012, Kumar Gala wrote:

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Can you list out which SoCs support it and which don't.  Having
this list will be useful in understanding which controller versions

supported it.

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P1020, p1021, p1022, p1024, p1015 and p4080 can't support it.
Mpc8536, p2020, and the other current DPAA silicon (e.g. p5020, p3041=

)

support it.

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Based on this, why don't we use the HOSTVER register to detect instead

of device tree:

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I've got a mild preference for handling quirk assignment in the DT
rather than in driver code, so I'd prefer to just push the original
patch to mmc-next as-is.  Does that sound okay?

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Why?  I only ask because I agree with Scott that this means you have to
update your device tree to get proper functionality.
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When the new silicon does not support CMD23,
if we don't update the device tree, then we must update the SDHC driver.
I prefer to add the property in device tree,
because we just add this property in new device tree, we don't need more ef=
fort to modify driver.