From: r.sricharan@ti•com (Sricharan R)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC PATCH 0/9] drivers: dma: Add support for dma-channel router
Date: Mon, 10 Mar 2014 19:28:55 +0530 [thread overview]
Message-ID: <531DC51F.50309@ti.com> (raw)
In-Reply-To: <CAL_JsqLF6Ey1t1BV4tnFcFK-KmOU9H2nQE+ZHoZRq2r_nRTxNw@mail.gmail.com>
Hi Rob,
On Sunday 09 March 2014 01:23 AM, Rob Herring wrote:
> On Fri, Mar 7, 2014 at 6:16 AM, Sricharan R <r.sricharan@ti•com> wrote:
>> In some SoCs the dma request lines from the peripherals are
>> routed to the dma-controller through a crossbar. With this the
>> dma controller's available request lines are shared between the
>> peripherals.
>>
>> This adds support to register the crossbar router associated with
>> a dma-channel and let the dma-controller driver map/unmap
>> the peripheral dma crossbar line to dma-controller's request
>> line.
> This is not a unique concept and should follow some existing pattern.
> Perhaps something like interrupt-map. For the dmas property, the
> parent should be the crossbar and then the crossbar block has to
> translate that into the DMA controller request. All the DMA ctrlr
> request connections should be described in the crossbar node. In
> theory, you could have chained crossbars. This should be documented as
> part of the generic DMA binding.
The idea here was to do the map/unmap crossbar<->dma-request
from the dma-controller at runtime just like any other resource, unlike
interrupt-map fixed in DTS. I did not think about the chained
crossbars case. I will add this here. And as you have suggested will
make it work like irq_parse_and_map.
Regards,
Sricharan
> There are also other similar IP like CoreSight CTI which are just
> signal routers. So there is probably some possibility of common code
> here.
>
> Rob
prev parent reply other threads:[~2014-03-10 13:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 12:16 [RFC PATCH 0/9] drivers: dma: Add support for dma-channel router Sricharan R
2014-03-07 12:16 ` [RFC PATCH 1/9] drivers: dma: omap-dma: Avoid hard-coding of the dma-request channels Sricharan R
2014-03-07 12:16 ` [RFC PATCH 2/9] drivers: dma: of-dma: Add support for dma-request line routers Sricharan R
2014-03-07 12:16 ` [RFC PATCH 3/9] drivers: dma: omap-dma: Add a seperate xlate function to get router data Sricharan R
2014-03-07 12:16 ` [RFC PATCH 4/9] drivers: omap-dma: Add crossbar line as a resource to omap_chan structure Sricharan R
2014-03-07 12:16 ` [RFC PATCH 5/9] drivers: dma: Add dma crossbar driver Sricharan R
2014-03-07 12:16 ` [RFC PATCH 6/9] arm: dts: dra: Add dma crossbar node Sricharan R
2014-03-07 12:16 ` [RFC PATCH 7/9] arm: dts: dra: Add dma-request crossbar phandle to dma-specs Sricharan R
2014-03-07 12:16 ` [RFC PATCH 8/9] arm: dra: Enable dma crossbar support on dra7xx Sricharan R
2014-03-07 12:16 ` [RFC PATCH 9/9] arm: dts: dra7: Change the total dma-req numbers to crossbar channels Sricharan R
2014-03-08 19:53 ` [RFC PATCH 0/9] drivers: dma: Add support for dma-channel router Rob Herring
2014-03-10 13:58 ` Sricharan R [this message]
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