From: Robin Murphy <robin.murphy@arm.com>
To: Maxime Ripard <maxime.ripard@bootlin.com>,
Georgi Djakov <georgi.djakov@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Arnd Bergmann <arnd@arndb.de>,
dri-devel@lists.freedesktop.org,
Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>,
Yong Deng <yong.deng@magewell.com>,
Frank Rowand <frowand.list@gmail.com>,
Dave Martin <dave.martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 1/7] dt-bindings: interconnect: Add a dma interconnect name
Date: Tue, 5 Mar 2019 16:14:26 +0000 [thread overview]
Message-ID: <0e72fbf7-b100-ddc5-3c19-32f71c37f76f@arm.com> (raw)
In-Reply-To: <20190305155337.glfvgyddvnkv774m@flea>
On 05/03/2019 15:53, Maxime Ripard wrote:
> Hi,
>
> On Fri, Mar 01, 2019 at 07:48:15PM +0200, Georgi Djakov wrote:
>> On 2/11/19 17:02, Maxime Ripard wrote:
>>> The current DT bindings assume that the DMA will be performed by the
>>> devices through their parent DT node, and rely on that assumption for the
>>> address translation using dma-ranges.
>>>
>>> However, some SoCs have devices that will perform DMA through another bus,
>>> with separate address translation rules. We therefore need to express that
>>> relationship, through the special interconnect name "dma".
>>>
>>> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
>>> ---
>>> Documentation/devicetree/bindings/interconnect/interconnect.txt | 3 +++
>>> 1 file changed, 3 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/interconnect/interconnect.txt b/Documentation/devicetree/bindings/interconnect/interconnect.txt
>>> index 5a3c575b387a..e69fc2d992c3 100644
>>> --- a/Documentation/devicetree/bindings/interconnect/interconnect.txt
>>> +++ b/Documentation/devicetree/bindings/interconnect/interconnect.txt
>>> @@ -51,6 +51,9 @@ interconnect-names : List of interconnect path name strings sorted in the same
>>> interconnect-names to match interconnect paths with interconnect
>>> specifier pairs.
>>>
>>> + Reserved interconnect names:
>>> + * dma: Path from the device to the main memory of the system
>>
>> Bikeshed: As it's from the device to the main memory, maybe here we can
>> also denote this my calling the path dma-mem or dma-memory. For other
>> paths, we are trying to mention both the source and the destination and
>> maybe it would be good to be consistent although this is special one.
>
> I'm not sure I understand what you mean. You'd like two interconnect
> names, one called dma-memory, and one memory-dma?
Hmm, yes, it's not like "dma" describes an actual source or destination
either :/
Robin.
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next prev parent reply other threads:[~2019-03-05 16:14 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 15:02 [PATCH v3 0/7] sunxi: Add DT representation for the MBUS controller Maxime Ripard
2019-02-11 15:02 ` [PATCH v3 1/7] dt-bindings: interconnect: Add a dma interconnect name Maxime Ripard
2019-03-01 17:48 ` Georgi Djakov
2019-03-05 15:53 ` Maxime Ripard
2019-03-05 16:14 ` Robin Murphy [this message]
2019-03-07 15:15 ` Georgi Djakov
2019-03-07 15:47 ` Maxime Ripard
2019-03-07 16:09 ` Chen-Yu Tsai
2019-03-11 10:11 ` Maxime Ripard
2019-03-11 14:11 ` Chen-Yu Tsai
2019-03-13 11:48 ` Georgi Djakov
2019-02-11 15:02 ` [PATCH v3 2/7] dt-bindings: bus: Add binding for the Allwinner MBUS controller Maxime Ripard
2019-02-12 18:53 ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 3/7] of: address: Add parent pointer to the __of_translate_address args Maxime Ripard
2019-02-12 18:02 ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 4/7] of: address: Add support for the parent DMA bus Maxime Ripard
2019-02-12 18:15 ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 5/7] drm/sun4i: Rely on dma interconnect for our RAM offset Maxime Ripard
2019-02-12 18:46 ` Robin Murphy
2019-02-13 15:41 ` Maxime Ripard
2019-02-13 16:40 ` Robin Murphy
2019-02-19 10:55 ` Maxime Ripard
2019-03-05 16:11 ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 6/7] clk: sunxi-ng: sun5i: Export the MBUS clock Maxime Ripard
2019-02-11 15:02 ` [PATCH v3 7/7] ARM: dts: sun5i: Add the MBUS controller Maxime Ripard
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