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Date: Tue, 27 Aug 2013 12:35:34 +0100
From: Mark Rutland <mark.rutland@....com>
To: "hongbo.zhang@...escale.com" <hongbo.zhang@...escale.com>
Cc: "rob.herring@...xeda.com" <rob.herring@...xeda.com>,
Pawel Moll <Pawel.Moll@....com>,
"swarren@...dotorg.org" <swarren@...dotorg.org>,
"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
"vinod.koul@...el.com" <vinod.koul@...el.com>,
"djbw@...com" <djbw@...com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 2/3] DMA: Freescale: Add new 8-channel DMA engine
device tree nodes
On Tue, Aug 27, 2013 at 11:42:02AM +0100, hongbo.zhang@...escale.com wrote:
> From: Hongbo Zhang <hongbo.zhang@...escale.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@...escale.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@...300 {
> + #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>;
> + 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.
> + 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@...300 {
> fsl,iommu-parent = <&pamu0>;
> fsl,liodn-reg = <&guts 0x580>; /* DMA1LIODNR */
> };
>
> -/include/ "qoriq-dma-1.dtsi"
> +/include/ "elo3-dma-1.dtsi"
> dma@...300 {
> 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.
Thanks,
Mark.
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