linux-kernel - Re: [PATCH v2 14/15] dmaengine: bcm2835: Add BCM2711 40-bit DMA support

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Date: Sun, 17 Mar 2024 13:38:25 +0100
From: Stefan Wahren <wahrenst@....net>
To: 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
Cc: Phil Elwell <phil@...pberrypi.org>, Maxime Ripard <maxime@...no.tech>,
 Dom Cobley <popcornmix@...il.com>
Subject: Re: [PATCH v2 14/15] dmaengine: bcm2835: Add BCM2711 40-bit DMA
 support

Hi Andrea,

Am 13.03.24 um 15:08 schrieb Andrea della Porta:
> BCM2711 has 4 DMA channels with a 40-bit address range, allowing them
> to access the full 4GB of memory on a Pi 4. Assume every channel is capable
> of 40-bit address range.
>
> Originally-by: Phil Elwell <phil@...pberrypi.org>
> Originally-by: Maxime Ripard <maxime@...no.tech>
> Originally-by: Stefan Wahren <stefan.wahren@...e.com>
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
>   drivers/dma/bcm2835-dma.c | 553 ++++++++++++++++++++++++++++++++------
>   1 file changed, 466 insertions(+), 87 deletions(-)

this patch contains a lot of changes (including style fixes). It would
be better to split this more for a better understanding.