[PATCH v2 4/4] ARM: dts: keystone: Add "ti, da830-uart" compatible string

[Santosh Shilimkar]

On 1/5/2017 1:04 AM, Sekhar Nori wrote:
> Hi Santosh,
>
> On Thursday 05 January 2017 03:30 AM, Santosh Shilimkar wrote:
>> On 1/4/2017 12:30 PM, David Lechner wrote:
>>> The TI Keystone SoCs have extra UART registers beyond the standard 8250
>>> registers, so we need a new compatible string to indicate this. Also, at
>>> least one of these registers uses the full 32 bits, so we need to specify
>>> reg-io-width in addition to reg-shift.
>>>
>>> "ns16550a" is left in the compatible specification since it does work as
>>> long as the bootloader configures the SoC UART power management
>>> registers.
>>>
>> NAK!!
>> We can't break the booting boards with existing boot loaders.
>
> Sorry, but it not clear to me how this breaks booting with older
> bootloaders? If older DTB is ROM'ed, it will continue to work because of
> match with ns16550a.
>
> I just verified boot on K2E with these patches applied and using 2016.05
> based U-Boot from a TI release.
>
> http://pastebin.ubuntu.com/23744719/
>
Thanks for test. As long as it doesn't break the boot, am fine
with it.

>> I suggest you to first get the driver updated to take care of
>> the UART PM register and then enable the support for it.
>
> Isn't that what patch 2/4 is doing?
>
I see that now. Thanks for clarifying.

Serial patch needs to go via Greg's tree. I will pick up the
DTS bits.

Regards,
Santosh