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[v4,1/4] dt-bindindgs: i2c: qcom,i2c-geni: Document shared flag

Message ID 20241113161413.3821858-2-quic_msavaliy@quicinc.com (mailing list archive)
State New
Headers show
Series Enable shared SE support over I2C | expand

Commit Message

Mukesh Kumar Savaliya Nov. 13, 2024, 4:14 p.m. UTC 
Adds qcom,is-shared flag usage. Use this flag when I2C serial controller
needs to be shared in multiprocessor system(APPS,Modem,ADSP) environment.

Two clients from different processors can share an I2C controller 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.

Transfer gets serialized by Lock TRE + DMA xfer + Unlock TRE at HW level.

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

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
index 9f66a3bb1f80..fe36938712f7 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 controller is shared between two or more system processors.
+    type: boolean
+
   reg:
     maxItems: 1