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Date: Thu, 17 Dec 2015 16:59:55 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Måns Rullgård <mans@...sr.com>, Tejun Heo <tj@...nel.org> Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel On Tue, 2015-12-15 at 23:34 +0000, Måns Rullgård wrote: > Mans Rullgard <mans@...sr.com> writes: > > > Currently this driver only works with a DesignWare DMA engine which > > it > > registers manually using the second "reg" address range and > > interrupt > > number from the DT node. > > > > This patch makes the driver instead use the "dmas" property if > > present, > > otherwise optionally falling back on the old way so existing device > > trees can continue to work. > > > > With this change, there is no longer any reason to depend on the > > 460EX > > machine type so drop that from Kconfig. > > > > Signed-off-by: Mans Rullgard <mans@...sr.com> > > --- > > drivers/ata/Kconfig | 10 ++- > > drivers/ata/sata_dwc_460ex.c | 192 +++++++++++++++++++++++++++-- > > -------------- > > 2 files changed, 131 insertions(+), 71 deletions(-) > > The corresponding patch for the canyonlands devicetree looks > something > like this. I don't have any such hardware or even a manual, so I > don't > know what values to use for the various required DT properties of the > DMA controller node, nor can I test it. The SATA driver works with a > different DMA controller on a Sigma Designs chip. > > diff --git a/arch/powerpc/boot/dts/canyonlands.dts > b/arch/powerpc/boot/dts/canyonlands.dts > index 3dc75de..959f36e 100644 > --- a/arch/powerpc/boot/dts/canyonlands.dts > +++ b/arch/powerpc/boot/dts/canyonlands.dts > @@ -190,12 +190,22 @@ > /* DMA */ 0x2 &UIC0 0xc > 0x4>; > }; > > + DMA0: dma@...d0800 { > + compatible = "snps,dma-spear1340"; > + reg = <4 0xbffd0800 0x400>; > + interrupt-parent = <&UIC3>; > + interrupts = <0x5 0x4>; > + #dma-cells = <3>; > + /* required properties here */ You have to move the master assignments and other custom dw_dmac properties. Maybe at some point I will fix that in dw/platform.c. > + }; > + > SATA0: sata@...d1000 { > compatible = "amcc,sata-460ex"; > - reg = <4 0xbffd1000 0x800 4 0xbffd0800 > 0x400>; > + reg = <4 0xbffd1000 0x800>; > interrupt-parent = <&UIC3>; > - interrupts = <0x0 0x4 /* SATA */ > - 0x5 0x4>; /* AHBDMA */ > + interrupts = <0x0 0x4>; > + dmas = <&DMA0 0 0 1>; > + dma-names = "sata-dma"; > }; > > POB0: opb { > > -- Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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