linux-kernel - Re: [PATCH v7 05/11] dmaengine: Introduce DMA-device device

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Date:   Fri, 10 Jul 2020 12:38:34 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Vinod Koul <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-mips@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 05/11] dmaengine: Introduce DMA-device device_caps
 callback

On Fri, Jul 10, 2020 at 11:45:03AM +0300, Andy Shevchenko wrote:
> On Fri, Jul 10, 2020 at 01:45:44AM +0300, Serge Semin wrote:
> > There are DMA devices (like ours version of Synopsys DW DMAC) which have
> > DMA capabilities non-uniformly redistributed between the device channels.
> > In order to provide a way of exposing the channel-specific parameters to
> > the DMA engine consumers, we introduce a new DMA-device callback. In case
> > if provided it gets called from the dma_get_slave_caps() method and is
> > able to override the generic DMA-device capabilities.
> 

> In light of recent developments consider not to add 'slave' and a such words to the kernel.

As long as the 'slave' word is used in the name of the dma_slave_caps
structure and in the rest of the DMA-engine subsystem, it will be ambiguous
to use some else terminology. If renaming needs to be done, then it should be
done synchronously for the whole subsystem.

-Sergey

> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>