linux-kernel - [PATCH 02/12] dt-bindings: display: msm: Add reg bus and rotator interconnects

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Message-Id: <20231125-topic-rb1_feat-v1-2-11d71b12b058@linaro.org>
Date:   Sat, 25 Nov 2023 15:17:30 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        Robert Marko <robimarko@...il.com>,
        Das Srinagesh <quic_gurus@...cinc.com>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Rob Herring <robh@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev, Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 02/12] dt-bindings: display: msm: Add reg bus and rotator
 interconnects

Apart from the already handled data bus (MAS_MDP_Pn<->DDR), there are
other connection paths:
- a path that connects rotator block to the DDR.
- a path that needs to be handled to ensure MDSS register access
  functions properly, namely the "reg bus", a.k.a the CPU-MDSS CFG
  interconnect.

Describe these paths bindings to allow using them in device trees and in
the driver

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
[Konrad: rework for one vs two MDP paths]
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 .../devicetree/bindings/display/msm/mdss-common.yaml   | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
index f69196e4cc76..c6305a6e0334 100644
--- a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
+++ b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
@@ -61,17 +61,27 @@ properties:
 
   ranges: true
 
+  # This is not a perfect description, but it's impossible to discern and match
+  # the entries like we do with interconnect-names
   interconnects:
     minItems: 1
     items:
       - description: Interconnect path from mdp0 (or a single mdp) port to the data bus
       - description: Interconnect path from mdp1 port to the data bus
+      - description: Interconnect path from CPU to the reg bus
 
   interconnect-names:
-    minItems: 1
-    items:
-      - const: mdp0-mem
-      - const: mdp1-mem
+    oneOf:
+      - minItems: 1
+        items:
+          - const: mdp0-mem
+          - const: cpu-cfg
+
+      - minItems: 2
+        items:
+          - const: mdp0-mem
+          - const: mdp1-mem
+          - const: cpu-cfg
 
   resets:
     items:

-- 
2.43.0