linux-kernel - [PATCH 2/3] dt-bindings: i2c: qup: Document interconnects

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Message-Id: <20231128-i2c-qup-dvfs-v1-2-59a0e3039111@kernkonzept.com>
Date:   Tue, 28 Nov 2023 10:48:36 +0100
From:   Stephan Gerhold <stephan.gerhold@...nkonzept.com>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephan Gerhold <stephan.gerhold@...nkonzept.com>
Subject: [PATCH 2/3] dt-bindings: i2c: qup: Document interconnects

When the I2C QUP controller is used together with a DMA engine it needs
to vote for the interconnect path to the DRAM. Otherwise it may be
unable to access the memory quickly enough.

Signed-off-by: Stephan Gerhold <stephan.gerhold@...nkonzept.com>
---
 Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml
index fc3077a7af0d..758d8f6321e1 100644
--- a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml
@@ -40,6 +40,9 @@ properties:
       - const: tx
       - const: rx
 
+  interconnects:
+    maxItems: 1
+
   interrupts:
     maxItems: 1
 
@@ -73,6 +76,7 @@ unevaluatedProperties: false
 examples:
   - |
     #include <dt-bindings/clock/qcom,gcc-msm8998.h>
+    #include <dt-bindings/interconnect/qcom,msm8996.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/power/qcom-rpmpd.h>
 
@@ -91,6 +95,7 @@ examples:
         pinctrl-1 = <&blsp1_i2c1_sleep>;
         power-domains = <&rpmpd MSM8909_VDDCX>;
         required-opps = <&rpmpd_opp_svs_krait>;
+        interconnects = <&pnoc MASTER_BLSP_1 &bimc SLAVE_EBI_CH0>;
         clock-frequency = <400000>;
 
         #address-cells = <1>;

-- 
2.39.2