On Wed May 20 17:30:07 2026 +0530, Jai Luthra wrote:
> 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 <[email protected]>
> Reviewed-by: Tomi Valkeinen <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Reviewed-by: Rob Herring (Arm) <[email protected]>
> Reviewed-by: Yemike Abhilash Chandra <[email protected]>
> Signed-off-by: Rishikesh Donadkar <[email protected]>
> Signed-off-by: Sakari Ailus <[email protected]>
Patch committed.
Thanks,
Sakari Ailus
.../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 b9f033f2f3ce..bf62998b0445 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@4500000 {
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>;
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