Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1740740
| From | Jon Hunter <jonathanh@nvidia.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller |
| Date | 2017-09-27 15:50 +0200 |
| Message-ID | <uukSS-3A0-21@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <utZv3-66l-11@gated-at.bofh.it> <uu9NN-4b6-15@gated-at.bofh.it> <uug2S-8no-19@gated-at.bofh.it> <uujtN-2gN-37@gated-at.bofh.it> <uukSR-3A0-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 27/09/17 14:44, Jon Hunter wrote: > > On 27/09/17 13:12, Dmitry Osipenko wrote: >> On 27.09.2017 11:34, Jon Hunter wrote: >>> >>> On 27/09/17 02:57, Dmitry Osipenko wrote: >>>> On 26.09.2017 17:50, Jon Hunter wrote: >>>>> >>>>> On 26/09/17 00:22, Dmitry Osipenko wrote: >>>>>> Document DT bindings for NVIDIA Tegra AHB DMA controller that presents >>>>>> on Tegra20/30 SoC's. >>>>>> >>>>>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> >>>>>> --- >>>>>> .../bindings/dma/nvidia,tegra20-ahbdma.txt | 23 ++++++++++++++++++++++ >>>>>> 1 file changed, 23 insertions(+) >>>>>> create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra20-ahbdma.txt >>>>>> >>>>>> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra20-ahbdma.txt b/Documentation/devicetree/bindings/dma/nvidia,tegra20-ahbdma.txt >>>>>> new file mode 100644 >>>>>> index 000000000000..2af9aa76ae11 >>>>>> --- /dev/null >>>>>> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra20-ahbdma.txt >>>>>> @@ -0,0 +1,23 @@ >>>>>> +* NVIDIA Tegra AHB DMA controller >>>>>> + >>>>>> +Required properties: >>>>>> +- compatible: Must be "nvidia,tegra20-ahbdma" >>>>>> +- reg: Should contain registers base address and length. >>>>>> +- interrupts: Should contain one entry, DMA controller interrupt. >>>>>> +- clocks: Should contain one entry, DMA controller clock. >>>>>> +- resets : Should contain one entry, DMA controller reset. >>>>>> +- #dma-cells: Should be <1>. The cell represents DMA request select value >>>>>> + for the peripheral. For more details consult the Tegra TRM's >>>>>> + documentation, in particular AHB DMA channel control register >>>>>> + REQ_SEL field. >>>>> >>>>> What about the TRIG_SEL field? Do we need to handle this here as well? >>>>> >>>> >>>> Actually, DMA transfer trigger isn't related a hardware description. It's up to >>>> software to decide what trigger to select. So it shouldn't be in the binding. >>> >>> I think it could be, if say a board wanted a GPIO to trigger a transfer. >>> >> >> GPIO isn't a very good example, there is no "GPIO" trigger. To me all triggers >> are software-defined, so that software could create transfer chains. > > TRM shows the following in the APBDMA_TRIG_REG_0 ... > > "XRQ_A: XRQ.A (GPIOA) (Hardware initiated DMA request)" Furthermore there are timer and hw-semaphore triggers as well. Jon -- nvpublic
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Dmitry Osipenko <digetx@gmail.com> - 2017-09-27 04:00 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Jon Hunter <jonathanh@nvidia.com> - 2017-09-27 10:40 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Dmitry Osipenko <digetx@gmail.com> - 2017-09-27 14:20 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Jon Hunter <jonathanh@nvidia.com> - 2017-09-27 15:50 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Jon Hunter <jonathanh@nvidia.com> - 2017-09-27 15:50 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Dmitry Osipenko <digetx@gmail.com> - 2017-09-27 16:30 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Stephen Boyd <sboyd@codeaurora.org> - 2017-09-28 01:40 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Jon Hunter <jonathanh@nvidia.com> - 2017-09-28 10:40 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Stephen Warren <swarren@wwwdotorg.org> - 2017-09-29 21:40 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Dmitry Osipenko <digetx@gmail.com> - 2017-09-30 05:20 +0200
Re: [PATCH v1 3/5] dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller Stephen Warren <swarren@wwwdotorg.org> - 2017-10-02 22:50 +0200
csiph-web