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2013-06-04 10:01 <mth> larsc: why does jz4740_dma_probe() return -EINVAL rather than -ENOMEM if devm_kzalloc returns NULL?
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2013-06-04 12:03 <larsc> mth: that's a mistake
2013-06-04 12:13 <mth> ok, then I won't copy that into the 4770 dma engine
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2013-06-04 12:59 <larsc> is the jz4770 dma controller that different?
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2013-06-04 13:25 <mth> not very different, but not exactly the same either
2013-06-04 13:25 <mth> by the way, there is still a hardcoded "6" in the last patch of the series
2013-06-04 13:25 <mth> in jz4740_dma_irq()
2013-06-04 13:27 <larsc> I see, thanks
2013-06-04 13:29 <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
2013-06-04 13:30 <mth> one difference I encountered is that the 4770 doesn't have single vs block mode anymore
2013-06-04 13:30 <mth> and the list of transfer types is different, but I think it only adds to it without conflicts (needs to be verified though)
2013-06-04 13:33 <mth> do you think it makes sense to share the same driver?
2013-06-04 13:33 <larsc> yes
2013-06-04 13:34 <mth> and if so, using #ifdef CONFIG_MACH_JZ4770 as a check, or a runtime check?
2013-06-04 13:34 <larsc> runtime
2013-06-04 13:34 <larsc> using a platform_device_id table\
2013-06-04 13:38 <mth> so there would be a "jz4740-dma" and a "jz4770-dma" entry in that table?
2013-06-04 13:38 <mth> and the associated driver_data would be an enum or flags or a pointer?
2013-06-04 13:39 <larsc> yes
2013-06-04 13:40 <mth> would it make sense to use the "jz_" prefix in function names rather than "jz4740_"?
2013-06-04 13:45 <larsc> I don't think it really matters
2013-06-04 13:45 <larsc> It's quite common to just use the name of the first supported device even if support for similar devices is added later
2013-06-04 13:50 <mth> the patches you submitted, could they be included in 3.10 or is this for 3.11 already?
2013-06-04 13:51 <larsc> 3.11
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2013-06-04 13:57 <mth> by the way, Dmitry Smagin and Antony Pavlov are modernizing and cleaning the 4750D kernel
2013-06-04 13:57 <mth> so there could be an opportunity in the future to get a wider range of SoCs supported
2013-06-04 14:01 <larsc> good :)
2013-06-04 14:03 <larsc> Btw. I've got devicetree working for most of jz4740
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2013-06-04 14:32 <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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