linux-kernel - Re: [PATCH 3/4] arm64: dts: exynos: Align DMA controller bus node name with dtschema

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Message-ID: <20200702060115.GB4175@kozik-lap>
Date:   Thu, 2 Jul 2020 08:01:15 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: Re: [PATCH 3/4] arm64: dts: exynos: Align DMA controller bus node
 name with dtschema

On Tue, Jun 30, 2020 at 09:34:52AM +0200, Marek Szyprowski wrote:
> Hi Krzysztof,
> 
> On 29.06.2020 22:44, Krzysztof Kozlowski wrote:
> > AMBA is a bus so name the node with DMA controllers just as "bus" to fix
> > dtschema warnings like:
> >
> >      amba: $nodename:0: 'amba' does not match '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> 
> Do we really need a separate 'bus' for those DMA controllers?
> 
> IMHO they are not different from the hw perspective from the other 
> devices available on the SoC. A separate bus is a historical thing, they 
> work fine when moved directly under the 'soc' node. The separate bus 
> only mimics the way Linux organizes its drivers. This comment affects 
> both ARM and ARM64.

Good point, other boards keep them under SoC usually. Thanks for
feedback.

Best regards,
Krzysztof