From: peter.ujfalusi@ti•com (Peter Ujfalusi)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] ARM: DTS: am33xx: Use the new DT bindings for the eDMA3
Date: Tue, 8 Dec 2015 12:22:09 +0200 [thread overview]
Message-ID: <5666AF51.9080306@ti.com> (raw)
In-Reply-To: <4387766.cHF7OBX0cm@wuerfel>
On 12/08/2015 11:51 AM, Arnd Bergmann wrote:
> On Tuesday 08 December 2015 09:42:26 Peter Ujfalusi wrote:
>> On 12/04/2015 11:51 PM, Tony Lindgren wrote:
>>>>
>>>> Please just drop the /bits/ 16 and use normal cells.
>>>
>>> Yeah agreed, makes things less confusing for sure
>>
>> 4.4 will be the first kernel where we will have the new eDMA bindings. I have
>> chosen to use 16bit array for specifying the channels used for memcpy
>> (ti,edma-memcpy-channels) and for the reserving paRAM slots
>> (ti,edma-reserved-slot-ranges). As of now we have maximum of 64 channels and
>> 512 paRAM slots. 16bit is more than enough to store this information and it
>> even gives us enough room if ever in the future these numbers are going to
>> increase (which they are not).
>>
>> But in order to change them to 32bit the driver needs to be changed as well.
>> Currently we do not have drivers (in 4.4) using the new bindings, 4.4 is not
>> yet out, so it might be possible to change the binding document and the driver
>> to use 32bit arrays. The driver internally uses 16bit type for these which I'm
>> not going to change, but the code parsing the DT needs to be adjusted for the
>> new data type.
>>
>> If Vinod is willing to take update for the DT binding of eDMA for 4.4-rc, I
>> can cook up the patch(es) to do so.
>
> I hadn't realized that it was already in 4.4-rc. The change should be trivial
> enough though, so I'd still do it. If Vinod would rather not change it now,
> it's not overly important though.
But this change must be done before we have actual users of these properties,
which is the am33xx, am437x and the da850 conversion series I have sent recently.
We might want to have this changed for 4.4 since it is going to be an LTS
release...
--
P?ter
next prev parent reply other threads:[~2015-12-08 10:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-04 10:45 [PATCH] ARM: DTS: am33xx: Use the new DT bindings for the eDMA3 Peter Ujfalusi
2015-12-04 17:21 ` Felipe Balbi
2015-12-04 18:47 ` Tony Lindgren
2015-12-04 21:36 ` Arnd Bergmann
2015-12-04 21:51 ` Tony Lindgren
2015-12-08 7:42 ` Peter Ujfalusi
2015-12-08 9:51 ` Arnd Bergmann
2015-12-08 10:22 ` Peter Ujfalusi [this message]
2015-12-08 10:25 ` Arnd Bergmann
2015-12-08 15:51 ` Tony Lindgren
2015-12-08 0:19 ` Tony Lindgren
2015-12-08 7:43 ` Peter Ujfalusi
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