linux-kernel - Re: [PATCH 0/2] Apple SIO driver

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Message-ID: <f4c19365-4006-50f7-6c4a-754c2a87c8ca@linaro.org>
Date:   Wed, 12 Jul 2023 21:42:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Martin Povišer <povik+lin@...ebit.org>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     asahi@...ts.linux.dev, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Apple SIO driver

On 12/07/2023 15:38, Martin Povišer wrote:
> Hi all,
> 
> see attached a driver for the SIO coprocessor found on recent Apple
> SoCs. This coprocessor provides general DMA services, it can feed
> many peripherals but so far it seems it will only be useful for
> audio output over HDMI/DisplayPort. So the driver here only supports
> the DMA_CYCLIC mode of transactions with the focus being on audio.
> There's a downstream prototype ALSA driver the DMA driver is being
> tested against.
> 
> Some of the boilerplate code in implementing the dmaengine interface
> was lifted from apple-admac.c. Among other things these two drivers
> have in common that they implement the DMA_CYCLIC regime on top of
> hardware/coprocessor layer supporting linear transactions only.
> 
> The binding schema saw two RFC rounds before and has a reviewed-by
> from Rob.
> https://lore.kernel.org/asahi/167693643966.613996.10372170526471864080.robh@kernel.org

Thank you for explanation. Then this is v3, not v1.

No need for resending, but if it happens, consider naming it v4. :)

Best regards,
Krzysztof