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Subject: Re: [PATCH 7/7] iommu: dart: Add t8110 DART support
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To:     Sven Peter <sven@svenpeter.dev>, Joerg Roedel <joro@8bytes.org>,
        Will Deacon <will@kernel.org>,
        Robin Murphy <robin.murphy@arm.com>
Cc:     Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        Janne Grunau <j@jannau.net>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        devicetree@vger.kernel.org, iommu@lists.linux.dev,
        asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
References: <20230104110013.24738-1-marcan@marcan.st>
 <20230104110013.24738-8-marcan@marcan.st>
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From:   Hector Martin <marcan@marcan.st>
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On 2023/01/04 22:50, Sven Peter wrote:
> Do you have any more details on this registers? For the 8103 DART
> we called it _CONFIG but I assume for the t8110 DART it can
> actually lock different parts of the HW instead of just a global lock?

This is based on R's reverse engineering here:

https://github.com/AsahiLinux/m1n1/blob/main/proxyclient/m1n1/hw/dart8110.py#L87

I don't think they ever fully nailed down exactly what the lock bit
behavior is, though.

- Hector