From: Frederic Chen <frederic.chen@mediatek.com>
To: <hans.verkuil@cisco.com>,
<laurent.pinchart+renesas@ideasonboard.com>, <tfiga@chromium.org>,
<matthias.bgg@gmail.com>, <mchehab@kernel.org>
Cc: <linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>, <Sean.Cheng@mediatek.com>,
<sj.huang@mediatek.com>, <christie.yu@mediatek.com>,
<holmes.chiou@mediatek.com>, <frederic.chen@mediatek.com>,
<Jerry-ch.Chen@mediatek.com>, <jungo.lin@mediatek.com>,
<Rynn.Wu@mediatek.com>, <linux-media@vger.kernel.org>,
<srv_heupstream@mediatek.com>
Subject: [RFC PATCH V0 1/7] [media] dt-bindings: mt8183: Add binding for DIP shared memory
Date: Fri, 1 Feb 2019 19:21:25 +0800 [thread overview]
Message-ID: <1549020091-42064-2-git-send-email-frederic.chen@mediatek.com> (raw)
In-Reply-To: <1549020091-42064-1-git-send-email-frederic.chen@mediatek.com>
This patch adds the binding for describing the shared memory
used to exchange configuration and tuning data between the
co-processor and Digital Image Processing (DIP) unit of the
camera ISP system on Mediatek SoCs.
Signed-off-by: Frederic Chen <frederic.chen@mediatek.com>
---
.../mediatek,reserve-memory-dip_smem.txt | 45 ++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt
diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt
new file mode 100644
index 0000000..0ded478
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt
@@ -0,0 +1,45 @@
+Mediatek DIP Shared Memory binding
+
+This binding describes the shared memory, which serves the purpose of
+describing the shared memory region used to exchange data between Digital
+Image Processing (DIP) and co-processor in Mediatek SoCs.
+
+The co-processor doesn't have the iommu so we need to use the physical
+address to access the shared buffer in the firmware.
+
+The Digital Image Processing (DIP) can access memory through mt8183 IOMMU so
+it can use dma address to access the memory region.
+(See iommu/mediatek,iommu.txt for the detailed description of Mediatek IOMMU)
+
+
+Required properties:
+
+- compatible: must be "mediatek,reserve-memory-dip_smem"
+
+- reg: required for static allocation (see reserved-memory.txt for
+ the detailed usage)
+
+- alloc-range: required for dynamic allocation. The range must
+ between 0x00000400 and 0x100000000 due to the co-processer's
+ addressing limitation
+
+- size: required for dynamic allocation. The unit is bytes.
+ If you want to enable the full feature of Digital Processing Unit,
+ you need 20 MB at least.
+
+
+Example:
+
+The following example shows the DIP shared memory setup for MT8183.
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+ reserve-memory-isp_smem {
+ compatible = "mediatek,reserve-memory-dip_smem";
+ size = <0 0x1400000>;
+ alignment = <0 0x1000>;
+ alloc-ranges = <0 0x40000000 0 0x50000000>;
+ };
+ };
--
1.9.1
next prev parent reply other threads:[~2019-02-01 11:22 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 11:21 [RFC PATCH V0 0/7] media: platform: Add support for Digital Image Processing (DIP) on mt8183 SoC Frederic Chen
2019-02-01 11:21 ` Frederic Chen [this message]
2019-02-09 15:59 ` [RFC PATCH V0 1/7] [media] dt-bindings: mt8183: Add binding for DIP shared memory Sakari Ailus
2019-02-09 18:17 ` Laurent Pinchart
2019-02-12 9:37 ` Frederic Chen
2019-02-13 3:41 ` Tomasz Figa
2019-02-01 11:21 ` [RFC PATCH V0 2/7] dts: arm64: mt8183: Add DIP shared memory node Frederic Chen
2019-02-01 11:21 ` [RFC PATCH V0 3/7] [media] dt-bindings: mt8183: Added DIP-SMEM dt-bindings Frederic Chen
2019-02-09 15:59 ` Sakari Ailus
2019-02-09 18:20 ` Laurent Pinchart
2019-02-12 9:50 ` Frederic Chen
2019-02-01 11:21 ` [RFC PATCH V0 4/7] [media] dt-bindings: mt8183: Added DIP dt-bindings Frederic Chen
2019-02-01 11:21 ` [RFC PATCH V0 5/7] dts: arm64: mt8183: Add DIP nodes Frederic Chen
2019-02-01 11:21 ` [RFC PATCH V0 6/7] media: platform: Add Mediatek DIP driver KConfig Frederic Chen
2019-02-01 11:21 ` [RFC PATCH V0 7/7] [media] platform: mtk-isp: Add Mediatek DIP driver Frederic Chen
2019-02-07 19:08 ` Brian Norris
[not found] ` <1550756198.11724.86.camel@mtksdccf07>
2019-02-23 6:18 ` Frederic Chen
2019-02-28 3:24 ` Brian Norris
2019-03-06 17:07 ` Frederic Chen
2019-03-14 8:46 ` [RFC PATCH V0 0/7] media: platform: Add support for Digital Image Processing (DIP) on mt8183 SoC Hans Verkuil
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