Re: [PATCH v3 03/14] dt-bindings: fsi: Document the FSI2PIB engine

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On 4/28/24 11:41, Krzysztof Kozlowski wrote:
On 26/04/2024 17:00, Eddie James wrote:
On 4/26/24 01:18, Krzysztof Kozlowski wrote:
On 25/04/2024 23:36, Eddie James wrote:
The FSI2PIB or SCOM engine provides an interface to the POWER processor
PIB (Pervasive Interconnect Bus).

Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx>
---
   .../devicetree/bindings/fsi/ibm,fsi2pib.yaml  | 38 +++++++++++++++++++
   1 file changed, 38 insertions(+)
   create mode 100644 Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml

diff --git a/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml b/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml
new file mode 100644
index 000000000000..4d557150c2e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fsi/ibm,fsi2pib.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: IBM FSI-attached SCOM engine
+
+maintainers:
+  - Eddie James <eajames@xxxxxxxxxxxxx>
+
+description:
+  The SCOM engine is an interface to the POWER processor PIB (Pervasive
+  Interconnect Bus). This node will always be a child of an FSI CFAM node;
+  see fsi.txt for details on FSI slave and CFAM nodes.
+
+properties:
+  compatible:
+    enum:
+      - ibm,fsi2pib
+      - ibm,i2cr-scom
Sometimes you call these p9, sometimes p10... what is the system or SoC
here? Aren't you adding some generic compatibles? writing-bindings and
numerous guides are clear on that.

Open source FSI support started with P9 chips so we initially added
p9-sbefifo, p9-occ, etc. P10 has all of the same engines as P9 plus the
SPI controller, so that's why SPI is p10-spi. P11 has the same engines
as P10. For scom/fsi2pib we could call it p9-scom I suppose... This
series isn't just documentation for a new system, I'm adding
documentation that should have been added for P9. Anyway I'm not sure
what you mean about generic compatibles? You mean just add a "scom" or
"fsi2pib" compatible? writing-bindings says "DO make 'compatible'
properties specific"
Usually it means that parts of SoC must have the name of the SoC, as
first component of the name. Your boards are a bit different here,
because I suppose no one will ever make a product except you, but still
code could follow same set of rules.


OK, this wasn't mentioned when fsi2spi binding was merged, and I thought to make fsi2pib the same. I can switch to p9-scom or something.


Thanks,

Eddie




Best regards,
Krzysztof





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