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<
mth>
larsc: why does jz4740_dma_probe() return -EINVAL rather than -ENOMEM if devm_kzalloc returns NULL?
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<
larsc>
mth: that's a mistake
<
mth>
ok, then I won't copy that into the 4770 dma engine
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<
larsc>
is the jz4770 dma controller that different?
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<
mth>
not very different, but not exactly the same either
<
mth>
by the way, there is still a hardcoded "6" in the last patch of the series
<
mth>
in jz4740_dma_irq()
<
larsc>
I see, thanks
<
mth>
the 4770 has 12 DMA channels, but they are split over two identical DMA controllers, so I think I can model that as two separate devices
<
mth>
one difference I encountered is that the 4770 doesn't have single vs block mode anymore
<
mth>
and the list of transfer types is different, but I think it only adds to it without conflicts (needs to be verified though)
<
mth>
do you think it makes sense to share the same driver?
<
mth>
and if so, using #ifdef CONFIG_MACH_JZ4770 as a check, or a runtime check?
<
larsc>
using a platform_device_id table\
<
mth>
so there would be a "jz4740-dma" and a "jz4770-dma" entry in that table?
<
mth>
and the associated driver_data would be an enum or flags or a pointer?
<
mth>
would it make sense to use the "jz_" prefix in function names rather than "jz4740_"?
<
larsc>
I don't think it really matters
<
larsc>
It's quite common to just use the name of the first supported device even if support for similar devices is added later
<
mth>
the patches you submitted, could they be included in 3.10 or is this for 3.11 already?
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<
mth>
by the way, Dmitry Smagin and Antony Pavlov are modernizing and cleaning the 4750D kernel
<
mth>
so there could be an opportunity in the future to get a wider range of SoCs supported
<
larsc>
Btw. I've got devicetree working for most of jz4740
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<
mth>
if I understood it correctly, devicetree is a way to put the platform data in the boot loader instead of the board source?
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