[PATCH 1/4] [v4][POWERPC] refactor dcr code
benh at kernel.crashing.org
Tue May 6 10:12:19 EST 2008
On Mon, 2008-05-05 at 10:56 -0700, Stephen Neuendorffer wrote:
> Previously, dcr support was configured at compile time to either using
> MMIO or native dcr instructions. Although this works for most
> platforms, it fails on FPGA platforms:
> 1) Systems may include more than one dcr bus.
> 2) Systems may be native dcr capable and still use memory mapped dcr interface.
> This patch provides runtime support based on the device trees for the
> case where CONFIG_PPC_DCR_MMIO and CONFIG_PPC_DCR_NATIVE are both
> selected. Previously, this was a poorly defined configuration, which
> happened to provide NATIVE support. The runtime selection is made
> based on the dcr controller having a 'dcr-access-method' attribute
> in the device tree. If only one of the above options is selected,
> then the code uses #defines to select only the used code in order to
> avoid introducing overhead in existing usage.
> Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer at xilinx.com>
Quick look seems ok, but that was really only a quick look :-)
I'll rely on Josh to review further.
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