Re: [PATCH v2 02/18] arm64: dts: ti: k3-j721e-main: Add multiple channels for CSI2RX DMA

[Yemike Abhilash Chandra]

Hi Udit,
Thanks for the review.

On 27/07/26 09:43, Kumar, Udit wrote:
> On 7/13/2026 5:04 PM, Yemike Abhilash Chandra wrote:
> > From: Vaishnav Achath <vaishnav.a@xxxxxx>
> >
> > J721E CSI2RX SHIM layer can support up to 32 DMA channel contexts. Add
> > additional DMA channels to enable multistream support for CSI2RX.
>
> If hardware supports 32 channel, then why you are limiting to 16
> channels only ?

While the J721E CSI2RX SHIM IP supports up to 32 DMA channel contexts, in
the current RM configuration, only 16[1] BCDMA RX channels are allocated
to the Linux host for CSI2RX.

Hence added channels accordingly.

Thanks and Regards,
Yemike Abhilash Chandra

[1]: 
https://github.com/u-boot/u-boot/blob/main/board/ti/j721e/rm-cfg.yaml#L1205

> > Signed-off-by: Vaishnav Achath <vaishnav.a@xxxxxx>
> > Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@xxxxxx>
> > ---
> >   arch/arm64/boot/dts/ti/k3-j721e-main.dtsi | 20 ++++++++++++++++----
> >   1 file changed, 16 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
> > index 5a8414fc5751..b1988437f52d 100644
> > --- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
> > @@ -600,8 +600,14 @@ ti_csi2rx0: ticsi2rx@4500000 {
> >   		ranges;
> >   		#address-cells = <2>;
> >   		#size-cells = <2>;
> > -		dmas = <&main_udmap 0x4940>;
> > -		dma-names = "rx0";
> > +		dmas = <&main_udmap 0x4940>, <&main_udmap 0x4941>, <&main_udmap 0x4942>,
> > +		       <&main_udmap 0x4943>, <&main_udmap 0x4944>, <&main_udmap 0x4945>,
> > +		       <&main_udmap 0x4946>, <&main_udmap 0x4947>, <&main_udmap 0x4948>,
> > +		       <&main_udmap 0x4949>, <&main_udmap 0x494a>, <&main_udmap 0x494b>,
> > +		       <&main_udmap 0x494c>, <&main_udmap 0x494d>, <&main_udmap 0x494e>,
> > +		       <&main_udmap 0x494f>;
> > +		dma-names = "rx0", "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
> > +			    "rx8", "rx9", "rx10", "rx11", "rx12", "rx13", "rx14", "rx15";
> >   		power-domains = <&k3_pds 26 TI_SCI_PD_EXCLUSIVE>;
> >   		status = "disabled";
> >   
> > @@ -656,8 +662,14 @@ ti_csi2rx1: ticsi2rx@4510000 {
> >   		ranges;
> >   		#address-cells = <2>;
> >   		#size-cells = <2>;
> > -		dmas = <&main_udmap 0x4960>;
> > -		dma-names = "rx0";
> > +		dmas = <&main_udmap 0x4960>, <&main_udmap 0x4961>, <&main_udmap 0x4962>,
> > +		       <&main_udmap 0x4963>, <&main_udmap 0x4964>, <&main_udmap 0x4965>,
> > +		       <&main_udmap 0x4966>, <&main_udmap 0x4967>, <&main_udmap 0x4968>,
> > +		       <&main_udmap 0x4969>, <&main_udmap 0x496a>, <&main_udmap 0x496b>,
> > +		       <&main_udmap 0x496c>, <&main_udmap 0x496d>, <&main_udmap 0x496e>,
> > +		       <&main_udmap 0x496f>;
> > +		dma-names = "rx0", "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
> > +			    "rx8", "rx9", "rx10", "rx11", "rx12", "rx13", "rx14", "rx15";
> >   		power-domains = <&k3_pds 27 TI_SCI_PD_EXCLUSIVE>;
> >   		status = "disabled";
> >