Hi,

On 1/22/23 16:36, Rob Herring wrote:

On Sat, Jan 21, 2023 at 9:36 AM Rayyan Ansari [off-list ref] wrote:

quoted

Why do you need this change?

The 'simple-framebuffer' contains data on how the bootloader
configured the display. The bootloader doesn't configure the display
size, so this information doesn't belong here. The information should
already be in the panel node, so also no point in duplicating it here.

The idea is that early boot code which uses the simplefb node (no more
complex display driver loaded yet) knows the panel's DPI so that it can
decide if hi-dpi rendering / scaling is necessary or not.

This definitely is a useful feature to have.

I guess that for dt systems an alternative approach could be to
add a link to the panel node to the simplefb dt-node.

Regards,

Hans