On 10/01/2014 01:01 PM, Marc Kleine-Budde wrote:

On 10/01/2014 11:06 AM, Roger Quadros wrote:

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On 10/01/2014 11:47 AM, Marc Kleine-Budde wrote:

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On 10/01/2014 10:45 AM, Roger Quadros wrote:

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On 09/30/2014 07:04 PM, Marc Kleine-Budde wrote:

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On 09/30/2014 05:25 PM, Wolfram Sang wrote:

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Yes, but syscon_regmap_lookup_by_phandle() doesn't need any support for
additional parameters. Have a look at:

drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c

First get the regmap, then the 1st argument is the offset in the regmap,
the 2nd and 3rd could be the bits.

So, for one driver the extra arguments are: <reg> <start_bit> <stop_bit>
For another driver (the stmmac example): <reg_offset> <reg_shift>

The DCAN's "reg" is a "reg_offset" as in the stmmc.

Roger, can we derive both start and done bit from a common reg_shift?

I'm sorry I didn't understand what you meant.

<&syscon_phandl> <reg offset> <start bit> <stop bit> should work well for us.
Even though reg offset is the same for both the DCAN instances.

What's start bit and stop bit for instance 0 and 1 on that SoC that has
two instances?

we have 3 SoCs at the moment, all have 2 DCAN instances.

AM33xx & AM43xx
instance	start	stop
1		0	8
2		1	9	

If we use a 0-based numbering for the instances:
instance	start		stop
0		(0 << instance)	(8 << instance)
1		(0 << instance)	(8 << instance)

How does the instance number get set? What happens on boards where the first instance is unused
while the second one is in use?

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DRA7xx
instance	start	stop
1		3	1
2		5	2

                ^
5 or 4?

Unfortunately it is 5 ;)
We have display IP related bit in between 3 and 5 :P

cheers,
-roger