On 21/05/18 14:46, Kevin Hilman wrote: > On Mon, May 21, 2018 at 11:43 AM, Roger Quadros <rogerq@xxxxxx> wrote: >> Hi Kevin, >> >> On 21/05/18 13:11, Kevin Hilman wrote: >>> Hi Roger, >>> >>> I'm looking at the dra7.dtsi to try to understand the base addresses, >>> and I'm rather confused about the node addresses vs the reg addresses >>> for both dcan1 and dcan2. >>> >>> Could you clarify why the reg address and node addresses are so >>> different for both, and where I might find the TRM that describes >>> these addresses? All I could find was a datasheet that didn't give >>> any info about the IP or the base addresses, but I'd really like to >>> understand what the *real* addresses are for this. >> >> From the TRM - http://www.ti.com/lit/pdf/sprui30 >> >> "Table 2-4. L4_WKUP Memory Map" contains DCAN1. >> >> "Table 2-6. L4_PER2 Memory Map" contains DCAN2. >> >> As they are in different domains, the addresses look different. >> >> Also in Chapter 24.10.5 DCAN Register Manual, >> Table 24-1120. DCAN Instance Summary, shows base addresses for both instances. > > Thanks for the details and pointer to the TRM, that helps. I see now > that the "reg =" lines in the DT nodes are correct, and match the TRM. > What makes it confusing is that these addresses don't match the DT > node addresses. > > IOW, it's confusing that these addresses are different > > dcan1: can@481cc000 { > reg = <0x4ae3c000 0x2000>; > > That doesn't have any affect on the code obviously, but it makes > reading the DT a bit confusing. > Right, that's by error and needs to be fixed. -- cheers, -roger Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
