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Message-ID: <542BDE32.6030309@ti.com>
Date: Wed, 1 Oct 2014 13:57:54 +0300
From: Roger Quadros <rogerq@...com>
To: Wolfram Sang <wsa@...-dreams.de>,
Marc Kleine-Budde <mkl@...gutronix.de>
CC: <wg@...ndegger.com>, <tony@...mide.com>, <tglx@...utronix.de>,
<mugunthanvnm@...com>, <george.cherian@...com>, <balbi@...com>,
<nsekhar@...com>, <nm@...com>,
<sergei.shtylyov@...entembedded.com>, <linux-omap@...r.kernel.org>,
<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] net: can: c_can: Add syscon/regmap RAMINIT mechanism
On 10/01/2014 01:43 PM, Wolfram Sang wrote:
>
>>> Unfortunately it is 5 ;)
>>> We have display IP related bit in between 3 and 5 :P
>>
>> What on earth were the HW engineers thinking????????????
>
> "Let's test my RNG on the bit-placement of this register" :)
:D
>
>> ...if we just have the instance parameter in the syscon phandle, we have
>> to put the mapping into the driver, which makes IMHO no sense, because
>> you have to touch the driver, if there is another SoC with the DCAN core.
My guess is that TI won't come up with a 3rd variant so we won't have to
touch the driver, but you never know for sure.
>
> ... which would be my preferred solution. I think new SoCs should have
> some kind of:
>
> compatible = "commodore,c64ultra", "bosch,d_can";
>
> in the DT anyhow to allow for SoC specific quirks/adjustments. And
> custom raminit belongs to that IMO (see the ti routine getting more and
> more specific).
>
Right. For now we need 2 start/stop definations for the existing TI Socs.
but where to store the raminit start/stop bits? The driver_data currently seems to
contain the CAN type C_CAN vs D_CAN without containing it in a platform_data structure.
Is it OK to create a new platform_data structure for CAN and put the type and raminit start/stop
bits there?
cheers,
-roger
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