linux-kernel - [PATCH v2 2/4] dt-bindings: display: msm: Add required dma-range property

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Date:   Thu, 20 Feb 2020 11:26:54 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     smasetty@...eaurora.org, John Stultz <john.stultz@...aro.org>,
        Sean Paul <sean@...rly.run>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Rob Herring <robh+dt@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        freedreno@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH v2 2/4] dt-bindings: display: msm: Add required dma-range property

The GMU node now requires a specific dma-range property so that the driver
can use the DMA API to do the few memory allocations required by the GMU.
This sets the IOMMU iova allocator to match the 'uncached' part of the
GMU virtual address space.

v2: Fix the dma-ranges tag. The third pair should be the size.

Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 Documentation/devicetree/bindings/display/msm/gmu.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/msm/gmu.yaml b/Documentation/devicetree/bindings/display/msm/gmu.yaml
index 776ff92..d11a073 100644
--- a/Documentation/devicetree/bindings/display/msm/gmu.yaml
+++ b/Documentation/devicetree/bindings/display/msm/gmu.yaml
@@ -83,6 +83,13 @@ properties:
       Phandle to the OPP table for the available GMU frequencies. Refer to
       ../../opp/opp.txt for more information.
 
+  dma-ranges:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Describe the dma-address range for the device. This should always
+      describe the range between 0x60000000 and 0x80000000 which represents
+      the uncached region of the GMU address space.
+
 required:
   - compatible
   - reg
@@ -95,6 +102,7 @@ required:
   - power-domain-names
   - iommus
   - operating-points-v2
+  - dma-ranges
 
 examples:
  - |
@@ -127,4 +135,6 @@ examples:
 
         iommus = <&adreno_smmu 5>;
         operating-points-v2 = <&gmu_opp_table>;
+
+        dma-ranges = <0 0x60000000 0 0x60000000 0 0x20000000>;
    };
-- 
2.7.4