On Mon, May 21, 2018 at 12:47 PM, Roger Quadros <rogerq@xxxxxx> wrote: > 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. Patch sent: https://marc.info/?l=linux-omap&m=152693331823905&w=2 Thanks, Kevin -- 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
