linux-kernel - [PATCH v3 01/13] dt-bindings: media: ti,j721e-csi2rx-shim: Support 32 dma chans

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Message-ID: <20250417065554.437541-2-r-donadkar@ti.com>
Date: Thu, 17 Apr 2025 12:25:42 +0530
From: Rishikesh Donadkar <r-donadkar@...com>
To: <jai.luthra@...ux.dev>, <mripard@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <r-donadkar@...com>, <devarsht@...com>,
        <y-abhilashchandra@...com>, <mchehab@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <vaishnav.a@...com>,
        <s-jain1@...com>, <vigneshr@...com>, <sakari.ailus@...ux.intel.com>,
        <hverkuil-cisco@...all.nl>, <tomi.valkeinen@...asonboard.com>,
        <jai.luthra@...asonboard.com>, <changhuang.liang@...rfivetech.com>,
        <jack.zhu@...rfivetech.com>, <laurent.pinchart@...asonboard.com>
Subject: [PATCH v3 01/13] dt-bindings: media: ti,j721e-csi2rx-shim: Support 32 dma chans

From: Jai Luthra <j-luthra@...com>

The CSI2RX SHIM IP can support 32x DMA channels. These can be used to
split incoming "streams" of data on the CSI-RX port, distinguished by
MIPI Virtual Channel (or Data Type), into different locations in memory.

Actual number of DMA channels allocated to CSI-RX is dependent on the
usecase, and can be modified using the K3 Resource Partitioning tool [1].
So set the minimum channels as 1 and maximum as 32.

Link: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_04/exports/docs/linux/How_to_Guides/Host/K3_Resource_Partitioning_Tool.html [1]
Link: https://www.ti.com/lit/pdf/spruiv7
Signed-off-by: Jai Luthra <j-luthra@...com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 .../bindings/media/ti,j721e-csi2rx-shim.yaml  | 39 +++++++++++++++++--
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/ti,j721e-csi2rx-shim.yaml b/Documentation/devicetree/bindings/media/ti,j721e-csi2rx-shim.yaml
index b9f033f2f3ce4..bf62998b0445a 100644
--- a/Documentation/devicetree/bindings/media/ti,j721e-csi2rx-shim.yaml
+++ b/Documentation/devicetree/bindings/media/ti,j721e-csi2rx-shim.yaml
@@ -20,11 +20,44 @@ properties:
     const: ti,j721e-csi2rx-shim
 
   dmas:
-    maxItems: 1
+    minItems: 1
+    maxItems: 32
 
   dma-names:
+    minItems: 1
     items:
       - const: rx0
+      - const: rx1
+      - const: rx2
+      - const: rx3
+      - const: rx4
+      - const: rx5
+      - const: rx6
+      - const: rx7
+      - const: rx8
+      - const: rx9
+      - const: rx10
+      - const: rx11
+      - const: rx12
+      - const: rx13
+      - const: rx14
+      - const: rx15
+      - const: rx16
+      - const: rx17
+      - const: rx18
+      - const: rx19
+      - const: rx20
+      - const: rx21
+      - const: rx22
+      - const: rx23
+      - const: rx24
+      - const: rx25
+      - const: rx26
+      - const: rx27
+      - const: rx28
+      - const: rx29
+      - const: rx30
+      - const: rx31
 
   reg:
     maxItems: 1
@@ -62,8 +95,8 @@ examples:
 
     ti_csi2rx0: ticsi2rx@...0000 {
         compatible = "ti,j721e-csi2rx-shim";
-        dmas = <&main_udmap 0x4940>;
-        dma-names = "rx0";
+        dmas = <&main_udmap 0x4940>, <&main_udmap 0x4941>;
+        dma-names = "rx0", "rx1";
         reg = <0x4500000 0x1000>;
         power-domains = <&k3_pds 26 TI_SCI_PD_EXCLUSIVE>;
         #address-cells = <1>;
-- 
2.34.1