samples: subsys: usb cdc acm composite with mini nb of USB EndPoints

[FRASTM]

The stm32f207 and stm32f429 target boards only have 4 bidir EP on the USB FS node
This is not enough to run the sample: simply exclude those 2 target platforms

Signed-off-by: Francois Ramu francois.ramu@st.com

[FRASTM]

Filtering the USB controller in the sample.yaml
filter: dt_prop("num-bidir-endpoints") > 4
is not a valid syntax

[tmon-nordic]

Filtering the USB controller in the sample.yaml
filter: dt_prop("num-bidir-endpoints") > 4
is not a valid syntax

@PerMac @gopiotr Could you please take a look? The problem with current PR is that excluding certain platforms is not going to scale. The better approach would be to have generic filter to not run the sample on targets that do not have the minimum number of endpoints.

[gopiotr]

Filtering the USB controller in the sample.yaml
filter: dt_prop("num-bidir-endpoints") > 4
is not a valid syntax

@PerMac @gopiotr Could you please take a look? The problem with current PR is that excluding certain platforms is not going to scale. The better approach would be to have generic filter to not run the sample on targets that do not have the minimum number of endpoints.

@tmon-nordic - yes, you are right that this would be valuable to make it possible to limit platform scope by this expression. I take quick look at what were already implemented in Twister and unfortunately dt_prop(...) expression is not handled :( I analyzed it and it won't be that easy to add it quickly and it requires more work. If this functionality is very important to you, please create issue for this and we will consider when we will be able to deliver it.

At this moment only following dt_ expressions are available in Twister's filter option:

1. dt_compat_enabled
2. dt_alias_exists
3. dt_enabled_alias_with_parent_compat
4. dt_label_with_parent_compat_enabled
5. dt_chosen_enabled
6. dt_nodelabel_enabled

https://github.com/zephyrproject-rtos/zephyr/blob/main/scripts/pylib/twister/expr_parser.py#L227-L301

So, if you are not able to replace dt_prop(...) by any of above expression (or maybe some KConfig option), then at this moment platform_exclude is only available solution.