On 09/01/2024 09:06, Michal Simek wrote:

On 1/9/24 09:00, Krzysztof Kozlowski wrote:

quoted

On 09/01/2024 04:53, Xu Yilun wrote:

quoted

On Mon, Jan 08, 2024 at 10:16:17AM +0100, Michal Simek wrote:

quoted

On 1/8/24 10:09, Krzysztof Kozlowski wrote:

quoted

On 05/01/2024 17:04, Michal Simek wrote:

quoted

Convert the generic fpga bridge DT binding to json-schema.

Signed-off-by: Michal Simek <michal.simek@amd.com>

quoted

+$id: http://devicetree.org/schemas/fpga/fpga-bridge.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: FPGA Bridge
+
+maintainers:
+  - Michal Simek [off-list ref]
+
+properties:
+  $nodename:
+    pattern: "^fpga-bridge(@.*)?$"

Not sure, but maybe we need to allow fpga-bridge-1? Could we have more
than one bridge on given system?

Yilun: Any comment on this?

We can have more bridges, but IIUC people use fpga-bridge@0, fpga-bridge@0
to identify them. So the expression is OK to me.

So you claim unit address thus reg with some sort of bus address is a
requirement? Then "?" is not correct in that pattern.

I expect it is about that people are using fpga-bridge@0 but bridge is not on 
the bus. Yilun said that reg property in altr,socfpga-fpga2sdram-bridge.yaml is 
optional which means no reg property no @XXX in node name.
That's why I think that expression is correct. If there are more bridges without 
reg property then I expect we need to get more examples to align expression.

If we allow node name without unit address, thus not being part of any
bus, then the only question is whether it is possible to have system
with more than two FPGA bridges. If the answer is "yes", which I think
is the case, then the pattern should already allow it:

(@[0-9a-f]+|-[0-9]+)?

Best regards,
Krzysztof