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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: <yuzhao@chromium.org>, <zwisler@chromium.org>,
	<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>, <devicetree@vger.kernel.org>,
	<shik@chromium.org>, <suleiman@chromium.org>
Subject: [RFC PATCH V1 1/6] dt-bindings: mt8183: Add binding for DIP shared memory
Date: Wed, 17 Apr 2019 18:45:06 +0800
Message-ID: <20190417104511.21514-2-frederic.chen@mediatek.com> (raw)
In-Reply-To: <20190417104511.21514-1-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 000000000000..64c001b476b9
--- /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-dip_smem {
+			compatible = "mediatek,reserve-memory-dip_smem";
+			size = <0 0x1400000>;
+			alignment = <0 0x1000>;
+			alloc-ranges = <0 0x40000000 0 0x50000000>;
+		};
+	};
-- 
2.18.0


  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-17 10:45 [RFC PATCH V1 0/6] media: platform: Add support for Digital Image Processing (DIP) on mt8183 SoC Frederic Chen
2019-04-17 10:45 ` Frederic Chen [this message]
2019-04-30  1:15   ` [RFC PATCH V1 1/6] dt-bindings: mt8183: Add binding for DIP shared memory Rob Herring
2019-05-07 14:22     ` Frederic Chen
2019-05-14 16:19       ` Rob Herring
2019-05-16  6:12         ` Tomasz Figa
2019-05-17 22:22           ` Rob Herring
2019-04-17 10:45 ` [RFC PATCH V1 2/6] dts: arm64: mt8183: Add DIP shared memory node Frederic Chen
2019-04-17 10:45 ` [RFC PATCH V1 3/6] dt-bindings: mt8183: Added DIP dt-bindings Frederic Chen
2019-04-30  1:16   ` Rob Herring
2019-05-07 14:16     ` Frederic Chen
2019-05-14 16:14       ` Rob Herring
2019-04-17 10:45 ` [RFC PATCH V1 4/6] dts: arm64: mt8183: Add DIP nodes Frederic Chen
2019-04-17 10:45 ` [RFC PATCH V1 5/6] media: platform: Add Mediatek DIP driver KConfig Frederic Chen
2019-04-17 10:45 ` [RFC PATCH V1 6/6] platform: mtk-isp: Add Mediatek DIP driver Frederic Chen
2019-05-09  9:48   ` Tomasz Figa
2019-05-21 19:14     ` Frederic Chen
2019-05-22 10:25       ` Tomasz Figa
2019-05-23 13:46         ` Frederic Chen
2019-05-29  3:38           ` Tomasz Figa
2019-06-11  8:48       ` Frederic Chen
2019-06-11  8:59         ` Tomasz Figa
2019-06-11 10:07           ` Frederic Chen
2019-06-11 10:13             ` Tomasz Figa
2019-06-25 11:35               ` Frederic Chen
2019-06-25 12:16     ` Frederic Chen
2019-06-26  4:24       ` Tomasz Figa
2019-05-22  9:51   ` Shik Chen
2019-05-23 14:24     ` Frederic Chen

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