linux-kernel - [PATCH v3 1/4] dt-bindindgs: i2c: qcom,i2c-geni: Document shared flag

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Message-Id: <20240927063108.2773304-2-quic_msavaliy@quicinc.com>
Date: Fri, 27 Sep 2024 12:01:05 +0530
From: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
To: konrad.dybcio@...aro.org, andersson@...nel.org, andi.shyti@...nel.org,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        conor+dt@...nel.org, agross@...nel.org, devicetree@...r.kernel.org,
        vkoul@...nel.org, linux@...blig.org, dan.carpenter@...aro.org,
        Frank.Li@....com, konradybcio@...nel.org, bryan.odonoghue@...aro.org,
        krzk+dt@...nel.org, robh@...nel.org
Cc: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
Subject: [PATCH v3 1/4] dt-bindindgs: i2c: qcom,i2c-geni: Document shared flag

Adds qcom,shared-se flag usage. Use this when particular I2C serial
controller needs to be shared between two subsystems.

SE = Serial Engine, meant for I2C controller here.
TRE = Transfer Ring Element, refers to Queued Descriptor.
SS = Subsystems (APPS processor, Modem, TZ, ADSP etc).

Example :
Two clients from different SS can share an I2C SE for same slave device
OR their owned slave devices.
Assume I2C Slave EEPROM device connected with I2C controller.
Each client from ADSP SS and APPS Linux SS can perform i2c transactions.
This gets serialized by lock TRE + DMA Transfers + Unlock TRE at HW level.

Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
---
 Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
index 9f66a3bb1f80..3b9b20a0edff 100644
--- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
@@ -60,6 +60,10 @@ properties:
   power-domains:
     maxItems: 1
 
+  qcom,shared-se:
+    description: True if I2C needs to be shared between two or more subsystems(SS).
+    type: boolean
+
   reg:
     maxItems: 1
 
-- 
2.25.1