linux-kernel - Re: [PATCH v3 08/10] dmaengine: sun6i: allow build on ARM64 platforms (sun50i)

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Date:   Tue, 31 Jan 2017 09:02:36 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Andre Przywara <andre.przywara@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v3 08/10] dmaengine: sun6i: allow build on ARM64
 platforms (sun50i)

On Tue, Jan 31, 2017 at 02:23:55AM +0800, Icenowy Zheng wrote:
> 
> 
> 31.01.2017, 00:41, "Vinod Koul" <vinod.koul@...el.com>:
> > On Sun, Jan 29, 2017 at 10:33:29AM +0800, Icenowy Zheng wrote:
> >>  As 64-bit Allwinner H5 SoC has the same DMA engine with H3, the DMA
> >>  driver should be allowed to be built for ARM64, in order to make it work on H5.
> >>
> >>  Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> >>  Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> >>  Acked-by: Chen-Yu Tsai <wens@...e.org>
> >>  ---
> >>  Patch introduced between v1 and v2, to satisfy the newly added H3/H5 audio
> >>  codec support.
> >>
> >>   drivers/dma/Kconfig | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >>  diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> >>  index 0d6a96ee9fc7..d01d59812cf3 100644
> >>  --- a/drivers/dma/Kconfig
> >>  +++ b/drivers/dma/Kconfig
> >>  @@ -157,7 +157,7 @@ config DMA_SUN4I
> >>
> >>   config DMA_SUN6I
> >>           tristate "Allwinner A31 SoCs DMA support"
> >>  - depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST
> >>  + depends on MACH_SUN6I || MACH_SUN8I || (ARM64 && ARCH_SUNXI) || COMPILE_TEST
> >
> > Do we really need ARM64 here? also looking at others I wonder why isn't
> > this MACH_SUNXI...?
> 
> You mean directly place "ARCH_SUNXI" here?
> 
> SUN4I/SUN5I/SUN7I do not use DMA_SUN6I, they have different DMA
> controllers.

No my question was different..

We have MACH_SUNxx for 6I and 8I, so why do we have ARCH_SUNXI and if its an
arch SUNXI, X means it can take any value...

This schema looks pretty confusing while reading

Also I had a question on usage of ARM64..

-- 
~Vinod