From: Jerry-ch Chen <Jerry-Ch.chen@mediatek.com>
To: <hans.verkuil@cisco.com>,
<laurent.pinchart+renesas@ideasonboard.com>, <tfiga@chromium.org>,
<matthias.bgg@gmail.com>, <mchehab@kernel.org>
Cc: devicetree@vger.kernel.org, Sean.Cheng@mediatek.com,
Rynn.Wu@mediatek.com, srv_heupstream@mediatek.com,
holmes.chiou@mediatek.com,
Jerry-ch Chen <jerry-ch.chen@mediatek.com>,
jungo.lin@mediatek.com, sj.huang@mediatek.com,
yuzhao@chromium.org, linux-mediatek@lists.infradead.org,
zwisler@chromium.org, christie.yu@mediatek.com,
frederic.chen@mediatek.com, linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: [RFC PATCH V0 1/7] dt-bindings: mt8183: Add binding for FD shared memory
Date: Wed, 20 Feb 2019 15:48:07 +0800 [thread overview]
Message-ID: <1550648893-42050-2-git-send-email-Jerry-Ch.chen@mediatek.com> (raw)
In-Reply-To: <1550648893-42050-1-git-send-email-Jerry-Ch.chen@mediatek.com>
This patch adds the binding for describing the shared memory
used to exchange meta data between the co-processor and Face
Detection (FD) unit of the camera system on Mediatek SoCs.
Signed-off-by: Jerry-ch Chen <jerry-ch.chen@mediatek.com>
---
.../mediatek,reserve-memory-fd_smem.txt | 44 ++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt
diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt
new file mode 100644
index 0000000..52ae507
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt
@@ -0,0 +1,44 @@
+Mediatek FD Shared Memory binding
+
+This binding describes the shared memory, which serves the purpose of
+describing the shared memory region used to exchange data between Face
+Detection hardware (FD) 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 Face Detection hardware (FD) 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-fd_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.
+ for Face Detection Unit, you need 1 MB at least.
+
+
+Example:
+
+The following example shows the FD shared memory setup for MT8183.
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+ reserve-memory-fd_smem {
+ compatible = "mediatek,reserve-memory-fd_smem";
+ size = <0 0x00100000>;
+ alignment = <0 0x1000>;
+ alloc-ranges = <0 0x40000000 0 0x100000000>;
+ };
+ };
\ No newline at end of file
--
1.9.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-20 7:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-20 7:48 [RFC PATCH V0 0/7] media: platform: Add support for Face Detection (FD) on mt8183 SoC Jerry-ch Chen
2019-02-20 7:48 ` Jerry-ch Chen [this message]
2019-02-20 7:48 ` [RFC PATCH V0 2/7] dts: arm64: mt8183: Add FD shared memory node Jerry-ch Chen
2019-02-20 7:48 ` [RFC PATCH V0 3/7] [media] dt-bindings: mt8183: Added FD-SMEM dt-bindings Jerry-ch Chen
2019-02-20 7:48 ` [RFC PATCH V0 4/7] [media] dt-bindings: mt8183: Added FD dt-bindings Jerry-ch Chen
2019-02-20 7:48 ` [RFC PATCH V0 5/7] dts: arm64: mt8183: Add FD nodes Jerry-ch Chen
2019-03-25 21:57 ` Rob Herring
2019-04-03 2:26 ` Jerry-ch Chen
2019-02-20 7:48 ` [RFC PATCH V0 6/7] media: platform: Add Mediatek FD driver KConfig Jerry-ch Chen
2019-03-14 8:40 ` [RFC PATCH V0 0/7] media: platform: Add support for Face Detection (FD) on mt8183 SoC Hans Verkuil
2019-03-21 10:29 ` Jerry-ch Chen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1550648893-42050-2-git-send-email-Jerry-Ch.chen@mediatek.com \
--to=jerry-ch.chen@mediatek.com \
--cc=Rynn.Wu@mediatek.com \
--cc=Sean.Cheng@mediatek.com \
--cc=christie.yu@mediatek.com \
--cc=devicetree@vger.kernel.org \
--cc=frederic.chen@mediatek.com \
--cc=hans.verkuil@cisco.com \
--cc=holmes.chiou@mediatek.com \
--cc=jungo.lin@mediatek.com \
--cc=laurent.pinchart+renesas@ideasonboard.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=matthias.bgg@gmail.com \
--cc=mchehab@kernel.org \
--cc=sj.huang@mediatek.com \
--cc=srv_heupstream@mediatek.com \
--cc=tfiga@chromium.org \
--cc=yuzhao@chromium.org \
--cc=zwisler@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).