linux-kernel - Re: [PATCH v2 15/15] ARM: dts: bcm2711: add bcm2711-dma node

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Date: Mon, 29 Apr 2024 16:13:50 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Saenz Julienne <nsaenz@...nel.org>, dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dave.stevenson@...pberrypi.com,
	Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH v2 15/15] ARM: dts: bcm2711: add bcm2711-dma node

On 08:26 Sun 14 Apr     , Krzysztof Kozlowski wrote:
> On 12/03/2024 10:12, Andrea della Porta wrote:
> > BCM2711 has 4 DMA channels with a 40-bit address range, allowing them
> > to access the full 4GB of memory on a Pi 4. Adding a new node to make
> > use of the DMA channels capable of 40 bit addressing.
> > 
> > Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
> > Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> > ---
> >  arch/arm/boot/dts/broadcom/bcm2711.dtsi | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/broadcom/bcm2711.dtsi b/arch/arm/boot/dts/broadcom/bcm2711.dtsi
> > index 22c7f1561344..d98e3cf0c569 100644
> > --- a/arch/arm/boot/dts/broadcom/bcm2711.dtsi
> > +++ b/arch/arm/boot/dts/broadcom/bcm2711.dtsi
> > @@ -552,6 +552,22 @@ scb {
> >  		ranges = <0x0 0x7c000000  0x0 0xfc000000  0x03800000>,
> >  			 <0x6 0x00000000  0x6 0x00000000  0x40000000>;
> >  
> > +		dma40: dma-controller@...07b00 {
> > +			compatible = "brcm,bcm2711-dma";
> > +			reg = <0x0 0x7e007b00 0x400>;
> > +			interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>, /* dma4 11 */
> > +				     <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>, /* dma4 12 */
> > +				     <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>, /* dma4 13 */
> > +				     <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>; /* dma4 14 */
> > +			interrupt-names = "dma11",
> > +					  "dma12",
> > +					  "dma13",
> > +					  "dma14";
> > +			#dma-cells = <1>;
> > +			/* The VPU firmware uses DMA channel 11 for VCHIQ */
> > +			brcm,dma-channel-mask = <0x7000>;
> 
> Isn't one of your commits saying - this property is replaced?

True. The next patchset revision will drop 'brcm,' prefix.
Many thanks for pointing that out.

Andrea

> 
> Best regards,
> Krzysztof
>