On 07/14/2018 05:49 PM, Tom Rini wrote:
On Sat, Jul 14, 2018 at 12:47:21PM +0200, Wolfgang Denk wrote:
Dear Felix,
In message <[email protected]> you wrote:
The motivation for writing this patch originates in the
effort of synchronizing U-Boot DT to Linux DT for am33xx SOCs.
The current am33xx.dtsi file from U-Boot defines the <reg-shift>
property for all UART nodes. The actual (4.18+) am33xx.dtsi
file from Linux does not define <reg-shift> anymore. To prevent
(probably difficult) changes in many .dts and .dtsi files once
the synchronization is done, one can use this new variable. For
the pdu001 board, for example, SYS_NS16550_REG_SHIFT is set
to 2; no need to clutter U-Boot and board specific dts files
with <reg-shift> properties.
Does this mean that U-Boot will not be able to use the same DTB as
Linux?
To be clear, it's the other way around. We can't use the Linux dtb/dts
files as they've dropped (and in other cases, aren't adding) these
properties as it's handled differently.
What does "differently" mean? Linux tries quite hard to be platform
agnostic, so a per-build-target #define surely isn't what they're doing.
Are they inferring the shift from the compatible? In that case, we
should do the same.
Alex
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