linux-kernel - [PATCH 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-v1-2-64449106a148@linaro.org>
Date:   Wed, 16 Nov 2022 11:21:49 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH 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.

This documents the I2C Serial Engine variant used within the I2C Master
Hub Wrapper. This serial engine variant lacks DMA support, and 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           | 61 +++++++++++++++++-----
 1 file changed, 49 insertions(+), 12 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..ea2c28e70cf5 100644
--- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
@@ -15,13 +15,13 @@ allOf:
 
 properties:
   compatible:
-    const: qcom,geni-i2c
+    enum:
+      - qcom,geni-i2c
+      - qcom,geni-i2c-master-hub
 
-  clocks:
-    maxItems: 1
+  clocks: true
 
-  clock-names:
-    const: se
+  clock-names: true
 
   clock-frequency:
     default: 100000
@@ -34,14 +34,9 @@ properties:
       - const: tx
       - const: rx
 
-  interconnects:
-    maxItems: 3
+  interconnects: true
 
-  interconnect-names:
-    items:
-      - const: qup-core
-      - const: qup-config
-      - const: qup-memory
+  interconnect-names: true
 
   interrupts:
     maxItems: 1
@@ -71,6 +66,48 @@ required:
   - clock-names
   - reg
 
+if:
+  properties:
+    compatible:
+      contains:
+        const: qcom,geni-i2c-master-hub
+then:
+  properties:
+    clock-names:
+      items:
+        - const: se
+        - const: core
+
+    clocks:
+      maxItems: 2
+
+    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:
+      maxItems: 3
+
+    interconnect-names:
+      items:
+        - const: qup-core
+        - const: qup-config
+        - const: qup-memory
+
 unevaluatedProperties: false
 
 examples:

-- 
b4 0.10.1