On 10/01/2014 11:06 AM, Roger Quadros wrote: > On 10/01/2014 11:47 AM, Marc Kleine-Budde wrote: >> On 10/01/2014 10:45 AM, Roger Quadros wrote: >>> On 09/30/2014 07:04 PM, Marc Kleine-Budde wrote: >>>> On 09/30/2014 05:25 PM, Wolfram Sang wrote: >>>>> >>>>>> 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)
> DRA7xx
> instance start stop
> 1 3 1
> 2 5 2
^
5 or 4?
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
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