media: dt-bindings: media: Document bindings for venus firmware device

Add devicetree binding documentation for firmware loader for video
hardware running on qualcomm chip.

Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Tested-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/qcom,venus.txt b/Documentation/devicetree/bindings/media/qcom,venus.txt
index 00d0d1b..b602c4c 100644 (file)
--- a/Documentation/devicetree/bindings/media/qcom,venus.txt
+++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
@@ -53,7 +53,8 @@
 
 * Subnodes
 The Venus video-codec node must contain two subnodes representing
-video-decoder and video-encoder.
+video-decoder and video-encoder, and one optional firmware subnode.
+Firmware subnode is needed when the platform does not have TrustZone.
 
 Every of video-encoder or video-decoder subnode should have:
 
@@ -79,6 +80,13 @@ Every of video-encoder or video-decoder subnode should have:
                    power domain which is responsible for collapsing
                    and restoring power to the subcore.
 
+The firmware subnode must have:
+
+- iommus:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: A list of phandle and IOMMU specifier pairs.
+
 * An Example
        video-codec@1d00000 {
                compatible = "qcom,msm8916-venus";
@@ -105,4 +113,8 @@ Every of video-encoder or video-decoder subnode should have:
                        clock-names = "core";
                        power-domains = <&mmcc VENUS_CORE1_GDSC>;
                };
+
+               video-firmware {
+                       iommus = <&apps_iommu 0x10b2 0x0>;
+               };
        };