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Message-ID: <521D9E89.7040700@freescale.com>
Date: Wed, 28 Aug 2013 14:54:01 +0800
From: Hongbo Zhang <hongbo.zhang@...escale.com>
To: Mark Rutland <mark.rutland@....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 08/27/2013 07:35 PM, Mark Rutland wrote:
> 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>;
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@...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.
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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