[RFC PATCH 1/5] dt: Provide a way to remove non-compliant nodes and properties

[Tom Rini]

On Sat, Aug 26, 2023 at 02:36:29PM +0530, Sughosh Ganu wrote:

> Add a function which is registered to spy for a EVT_FT_FIXUP event,
> and removes the non upstreamed nodes and properties from the
> devicetree before it gets passed to the OS.
> 
> This allows removing entire nodes, or specific properties under nodes
> from the devicetree. The required nodes and properties can be
> registered for removal through the DT_NON_COMPLIANT_PURGE and
> DT_NON_COMPLIANT_PURGE_LIST macros.
> 
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>

So, the conceptual problem here is that while we do need to have a way
to purge nodes and properties that have been rejected by upstream, we
also need to ensure an upstream attempt was made. To that end, how I
envision things is:
- When we build the docs, something under doc/develop/ has a page /
  section for each binding we're purging, which links to and summarizes
  why it's not appropriate for upstream.
- It's non-default to purge said nodes.
- We at least make checkpatch / et al complain about new purges being
  added, and CI failing on the number of purges increasing without also
  increasing the number of allowed purges.

-- 
Tom
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