linux-kernel - [PATCH v2 2/6] dt-bindings: i2c: qcom-geni: document I2C Master Hub serial I2C engine

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Message-Id: <20221114-narmstrong-sm8550-upstream-i2c-master-hub-v2-2-aadaa6997b28@linaro.org>
Date:   Fri, 18 Nov 2022 09:45:06 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: [PATCH v2 2/6] dt-bindings: i2c: qcom-geni: document I2C Master Hub serial
 I2C engine

The I2C Master Hub is a stripped down version of the GENI Serial Engine
QUP Wrapper Controller but only supporting I2C serial engines without
DMA support.

Document the I2C Serial Engine variant used within the I2C Master
Hub Wrapper.

This serial engine variant lacks DMA support, requires a core clock,
and since DMA support is lacking the memory interconnect path isn't
needed.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 .../bindings/i2c/qcom,i2c-geni-qcom.yaml           | 64 ++++++++++++++++++----
 1 file changed, 54 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
index 0e7ed00562e2..f5f7dc8f325c 100644
--- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
@@ -10,18 +10,19 @@ maintainers:
   - Andy Gross <agross@...nel.org>
   - Bjorn Andersson <bjorn.andersson@...aro.org>
 
-allOf:
-  - $ref: /schemas/i2c/i2c-controller.yaml#
-
 properties:
   compatible:
-    const: qcom,geni-i2c
+    enum:
+      - qcom,geni-i2c
+      - qcom,geni-i2c-master-hub
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   clock-names:
-    const: se
+    minItems: 1
+    maxItems: 2
 
   clock-frequency:
     default: 100000
@@ -35,13 +36,12 @@ properties:
       - const: rx
 
   interconnects:
+    minItems: 2
     maxItems: 3
 
   interconnect-names:
-    items:
-      - const: qup-core
-      - const: qup-config
-      - const: qup-memory
+    minItems: 2
+    maxItems: 3
 
   interrupts:
     maxItems: 1
@@ -71,6 +71,50 @@ required:
   - clock-names
   - reg
 
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,geni-i2c-master-hub
+    then:
+      properties:
+        clocks:
+          minItems: 2
+
+        clock-names:
+          items:
+            - const: se
+            - const: core
+
+        dmas: false
+        dma-names: false
+
+        interconnects:
+          maxItems: 2
+
+        interconnect-names:
+          items:
+            - const: qup-core
+            - const: qup-config
+    else:
+      properties:
+        clocks:
+          maxItems: 1
+
+        clock-names:
+          const: se
+
+        interconnects:
+          minItems: 3
+
+        interconnect-names:
+          items:
+            - const: qup-core
+            - const: qup-config
+            - const: qup-memory
+
 unevaluatedProperties: false
 
 examples:

-- 
b4 0.10.1