linux-kernel - Re: [PATCH v4 0/3] Tegra GPCDMA: dma-channel-mask support

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Message-ID: <Y3FwTHpWgeK6x6kh@matsya>
Date:   Mon, 14 Nov 2022 04:01:40 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     ldewangan@...dia.com, jonathanh@...dia.com,
        thierry.reding@...il.com, p.zabel@...gutronix.de,
        dmaengine@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        sfr@...b.auug.org.au
Subject: Re: [PATCH v4 0/3] Tegra GPCDMA: dma-channel-mask support

On 10-11-22, 22:47, Akhil R wrote:
> Read dma-channel-mask from device tree and register only the
> specified channels. This is useful to reserve some channels for the
> firmware.
> 
> Also update the channel number and interrupts to include all 32
> channels. The current DT bindings has only 31 interrupts which is wrong
> and doesn't align with the hardware. This was done to reserve channel0
> for the firmware. Now with this change, the driver can align more to the
> actual hardware. but this implies that there will be a breakage in the
> ABI and device tree must be updated along with the driver change
> for it to pickup the right interrupt corresponding to the channel.
> 
> This breakage is okay right now because GPC DMA was introduced on
> Tegra186 and the DT bindings were added in 5.19. Any products released
> with this IP were released with kernels prior to 5.19 and bindings that
> were never in-tree. Any of those products that are supported upstream we
> know have replaceable DTB images (i.e. by default they are flashed at the
> same time as the kernel image).

Applied 1 & 3, thanks

-- 
~Vinod