linux-kernel - Re: [PATCH 6/7] iommu: dart: Support different variants with different registers

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Message-Id: <2267ef84-a167-4cd6-86fd-725e064eae62@app.fastmail.com>
Date:   Thu, 05 Jan 2023 10:46:09 +0100
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Hector Martin" <marcan@...can.st>,
        "Joerg Roedel" <joro@...tes.org>, "Will Deacon" <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>
Cc:     "Alyssa Rosenzweig" <alyssa@...enzweig.io>,
        "Janne Grunau" <j@...nau.net>, "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, iommu@...ts.linux.dev,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] iommu: dart: Support different variants with different
 registers

Hi,

On Thu, Jan 5, 2023, at 06:16, Hector Martin wrote:
> On 2023/01/04 22:43, Sven Peter wrote:
>> On Wed, Jan 4, 2023, at 12:00, Hector Martin wrote:
>>> +	u64 enable_streams;
>>> +	u64 disable_streams;
>> I don't think disable_streams is used anywhere. I assume you just left it in
>> here to document it?
>
> Yeah, we don't use this field ever, so we might as well drop it. I'll
> leave the #define for T8110 in though, as documentation.
>
>>> +	u64 ttbr;
>>> +	u64 ttbr_valid;
>>> +	u64 ttbr_addr_off;
>> 
>> This name confused me a bit since off sounds like offset to me while
>> this is actually another shift. Can't really think of a better name
>> right now though. I'd at least a comment here to describe it.
>
> How about `ttbr_addr_field_shift`?

Sounds good to me!


Sven