Re: [PATCH v4 3/7] LoongArch: Allow device trees to be built into the kernel

On Thu, Aug 24, 2023 at 11:20:34AM +0800, Binbin Zhou wrote:

Hi Rob:

On Thu, Aug 24, 2023 at 3:42 AM Rob Herring [off-list ref] wrote:

quoted

On Wed, Aug 23, 2023 at 05:54:51PM +0800, Binbin Zhou wrote:

quoted

Some systems do not provide a useful device tree to the kernel at boot
time. Let's keep a device tree table in the kernel, keyed by the dts
filename, containing the relevant DTBs.

Support for this in other arches was added to support legacy bootloaders
with no DT support. You should not need this for a new architecture. Fix
the bootloader to provide a useful DT.

Yes, our bootloader already supports DT.

Our original intention of providing kernel built-in DTS is to describe
all possible device information of that SoC, so that everyone can use
it as a reference during development; we will unlikely to add more
.dts files to the kernel besides the reference ones.

And as a reference, our built-in DTS provides the most basic bootable
combinations (so it is generic enough) as an alternative in case the
DTS in the bootloader is unexpected.

Does this make any sense?

I don't see how this answers the question - as far as I can tell Rob was
asking specifically about the building the dtb into the kernel, whereas
your response seems to talk about havint the dts files in the kernel
tree.