Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 28 Aug 2013 14:54:01 +0800 | From | Hongbo Zhang <> | Subject | Re: [PATCH v8 2/3] DMA: Freescale: Add new 8-channel DMA engine device tree nodes |
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On 08/27/2013 07:35 PM, Mark Rutland wrote: > On Tue, Aug 27, 2013 at 11:42:02AM +0100, hongbo.zhang@freescale.com wrote: >> From: Hongbo Zhang <hongbo.zhang@freescale.com> >> >> Freescale QorIQ T4 and B4 introduce new 8-channel DMA engines, this patch adds >> the device tree nodes for them. >> >> Signed-off-by: Hongbo Zhang <hongbo.zhang@freescale.com> >> --- >> .../devicetree/bindings/powerpc/fsl/dma.txt | 66 ++++++++++++++++ >> arch/powerpc/boot/dts/fsl/b4si-post.dtsi | 4 +- >> arch/powerpc/boot/dts/fsl/elo3-dma-0.dtsi | 81 ++++++++++++++++++++ >> arch/powerpc/boot/dts/fsl/elo3-dma-1.dtsi | 81 ++++++++++++++++++++ >> arch/powerpc/boot/dts/fsl/t4240si-post.dtsi | 4 +- >> 5 files changed, 232 insertions(+), 4 deletions(-) >> create mode 100644 arch/powerpc/boot/dts/fsl/elo3-dma-0.dtsi >> create mode 100644 arch/powerpc/boot/dts/fsl/elo3-dma-1.dtsi >> >> diff --git a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt >> index ddf17af..10fd031 100644 >> --- a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt >> +++ b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt >> @@ -126,6 +126,72 @@ Example: >> }; >> }; >> >> +** Freescale Elo3 DMA Controller >> + This is EloPlus controller with 8 channels, used in Freescale Txxx and Bxxx >> + series chips, such as t1040, t4240, b4860. >> + >> +Required properties: >> + >> +- compatible : must include "fsl,elo3-dma" >> +- reg : <registers specifier for DMA general status reg> >> +- ranges : describes the mapping between the address space of the >> + DMA channels and the address space of the DMA controller >> + >> +- DMA channel nodes: >> + - compatible : must include "fsl,eloplus-dma-channel" >> + - reg : <registers specifier for channel> >> + - interrupts : <interrupt specifier for DMA channel IRQ> >> + - interrupt-parent : optional, if needed for interrupt mapping >> + >> +Example: >> +dma@100300 { >> + #address-cells = <1>; >> + #size-cells = <1>; >> + compatible = "fsl,elo3-dma"; >> + reg = <0x100300 0x4 0x100600 0x4>; > Is that one reg entry where #size-cells=2 and #address-cells=2? > > That's what the binding implies (given it only describes a single reg > entry). > > if it's two entries, we should make that explicit (both in the binding > and example): > > reg = <0x100300 0x4>, > <0x100600 0x4>; Yes they are two entries, I will change it this way. >> + ranges = <0x0 0x100100 0x500>; > If it is one reg entry then the example ranges property isn't big enough > to contain the parent-bus-address. They are two reg entries, so the range is big enough. > >> + dma-channel@0 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x0 0x80>; >> + interrupts = <28 2 0 0>; >> + }; >> + dma-channel@80 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x80 0x80>; >> + interrupts = <29 2 0 0>; >> + }; >> + dma-channel@100 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x100 0x80>; >> + interrupts = <30 2 0 0>; >> + }; >> + dma-channel@180 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x180 0x80>; >> + interrupts = <31 2 0 0>; >> + }; >> + dma-channel@300 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x300 0x80>; >> + interrupts = <76 2 0 0>; >> + }; >> + dma-channel@380 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x380 0x80>; >> + interrupts = <77 2 0 0>; >> + }; >> + dma-channel@400 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x400 0x80>; >> + interrupts = <78 2 0 0>; >> + }; >> + dma-channel@480 { >> + compatible = "fsl,eloplus-dma-channel"; >> + reg = <0x480 0x80>; >> + interrupts = <79 2 0 0>; >> + }; >> +}; >> + >> Note on DMA channel compatible properties: The compatible property must say >> "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel" to be used by the Elo DMA >> driver (fsldma). Any DMA channel used by fsldma cannot be used by another >> diff --git a/arch/powerpc/boot/dts/fsl/b4si-post.dtsi b/arch/powerpc/boot/dts/fsl/b4si-post.dtsi >> index 7399154..ea53ea1 100644 >> --- a/arch/powerpc/boot/dts/fsl/b4si-post.dtsi >> +++ b/arch/powerpc/boot/dts/fsl/b4si-post.dtsi >> @@ -223,13 +223,13 @@ >> reg = <0xe2000 0x1000>; >> }; >> >> -/include/ "qoriq-dma-0.dtsi" >> +/include/ "elo3-dma-0.dtsi" >> dma@100300 { >> fsl,iommu-parent = <&pamu0>; >> fsl,liodn-reg = <&guts 0x580>; /* DMA1LIODNR */ >> }; >> >> -/include/ "qoriq-dma-1.dtsi" >> +/include/ "elo3-dma-1.dtsi" >> dma@101300 { >> fsl,iommu-parent = <&pamu0>; >> fsl,liodn-reg = <&guts 0x584>; /* DMA2LIODNR */ >> diff --git a/arch/powerpc/boot/dts/fsl/elo3-dma-0.dtsi b/arch/powerpc/boot/dts/fsl/elo3-dma-0.dtsi >> new file mode 100644 >> index 0000000..69a3277 >> --- /dev/null >> +++ b/arch/powerpc/boot/dts/fsl/elo3-dma-0.dtsi >> @@ -0,0 +1,81 @@ >> +/* >> + * QorIQ DMA device tree stub [ controller @ offset 0x100000 ] > Copy-pasted? > > Presumably should be "Elo3 DMA devicetree stub", or similar? > > Similarly for elo3-dma-1.dtsi. Yes copy-pasted, but QorIQ isn't wrong, it is name of Freescale series chips. To be more specific, I'd like to use "QorIQ Elo3 DMA devicetree stub" > Thanks, > Mark. >
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