Hi Andy/Bin, > -----Original Message----- > From: Bin Meng [mailto:[email protected]] > Sent: Wednesday, August 21, 2019 2:45 AM > To: Andy Shevchenko <[email protected]> > Cc: Park, Aiden <[email protected]>; [email protected] > Subject: Re: [U-Boot] [PATCH 1/1] serial: ns16550: Read reg-io-type from > device tree > > On Wed, Aug 21, 2019 at 3:26 PM Andy Shevchenko > <[email protected]> wrote: > > > > On Wed, Aug 21, 2019 at 3:43 AM Park, Aiden <[email protected]> > wrote: > > > > > > ns16550 can select register access type from device tree. > > > This also allows an inherited serial driver of ns16550 to configure > > > register access type at run-time by overriding ofdata_to_platdata. > > > > > > > Can you elaborate more on this? > > > > For now it looks like a hack due to misunderstanding of the design. > Right, this is a just hack. As Bin said, we may need refactor whole codes. By the way, do we need to keep current design which selects I/O port or MMIO at compile time by defining CONFIG_SYS_NS16550_PORT_MAPPED or CONFIG_SYS_NS16550_MEM32?
> The reg-io-type is not a standard DTS property for 8250 > (Documentation/devicetree/bindings/serial/8250.txt) so I guess we may > need refactor the ns16550 codes to support both I/O port and memory- > mapped variants. > Thanks for letting me know 8250.txt(doc/device-tree-bindings/serial/8250.txt). I agree that ns16550 codes may need refactor. Let me abandon this patch. > Regards, > Bin Best Regards, Aiden _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
