linux-kernel - [PATCH v5 2/3] arm64: dts: imx8-ss-img: Add vendor prefix in slot property

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Message-Id: <c2ca56b58038415f112e1d8018880323f44b6fac.1697597713.git.ming.qian@nxp.com>
Date:   Thu, 19 Oct 2023 10:48:01 +0800
From:   "Ming Qian (OSS)" <ming.qian@....nxp.com>
To:     mirela.rabulea@....nxp.com, robh+dt@...nel.org, shawnguo@...nel.org
Cc:     krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        xiahong.bao@....com, eagle.zhou@....com, tao.jiang_2@....com,
        ming.qian@....com, linux-imx@....com, devicetree@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 2/3] arm64: dts: imx8-ss-img: Add vendor prefix in slot property

From: Ming Qian <ming.qian@....com>

The slot property isn't generic property, add vendor prefix. Change the
property name to nxp,slot.

This IP includes a jpeg wrapper and a jpeg engine, the wrapper is
working on descriptor based manner. It supports up to 4 slots, each slot
can have its own chained descriptors. Host won't configure the engine
directly, but fill some descriptors to encode or decode one jpeg
picture. Then configure the descriptors to certain slot register. The
jpeg wrapper will schedule between different slots. When some slot is
finished, the slot interrupt will be triggered. The purpose of slot is
that engine can be shared across multiple VMS and os.

Currently, power domains and interrupts are enabled for all 4 slots, but
only one slot is used. There is no benefit in using more that one slot
from within the same OS, as the slots are scheduled in round-robin
manner and not executed in parallel.

Use the property "nxp,slot" to assign a single slot, and just expose the
parts of the h/w for the assigned slot. For example, only put slot 1's
power-domains entry in the DT when slot 1 is assigned. If not specified,
0 is used by default.

Fixes: 5943de495b6d ("arm64: dts: imx8-ss-img: Assign slot for imx jpeg encoder/decoder")
Signed-off-by: Ming Qian <ming.qian@....com>
---
v5
- improve commit message
- update patch based on commit 4d5ab2376ec5

v4
- improve commit message

v3
- add vender prefix, change property slot to nxp,slot

v2
- add a new property in bindings document

 arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi b/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
index e7783cc2d830..8ba4b0260a6b 100644
--- a/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
@@ -27,7 +27,7 @@ jpegdec: jpegdec@...00000 {
 		assigned-clock-rates = <200000000>, <200000000>;
 		power-domains = <&pd IMX_SC_R_MJPEG_DEC_MP>,
 				<&pd IMX_SC_R_MJPEG_DEC_S0>;
-		slot = <0>;
+		nxp,slot = <0>;
 	};

 	jpegenc: jpegenc@...50000 {
@@ -41,7 +41,7 @@ jpegenc: jpegenc@...50000 {
 		assigned-clock-rates = <200000000>, <200000000>;
 		power-domains = <&pd IMX_SC_R_MJPEG_ENC_MP>,
 				<&pd IMX_SC_R_MJPEG_ENC_S0>;
-		slot = <0>;
+		nxp,slot = <0>;
 	};

 	img_jpeg_dec_lpcg: clock-controller@...d0000 {
-- 
2.38.1