linux-kernel - Re: [PATCH v3 05/10] dmaengine: Introduce DMA-device device

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Message-ID: <20200528144257.GS1634618@smile.fi.intel.com>
Date:   Thu, 28 May 2020 17:42:57 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Vinod Koul <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Serge Semin <fancer.lancer@...il.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 v3 05/10] dmaengine: Introduce DMA-device device_caps
 callback

On Wed, May 27, 2020 at 01:50:16AM +0300, Serge Semin wrote:
> There are DMA devices (like ours version of Synopsys DW DMAC) which have
> DMA capabilities non-uniformly redistributed amongst 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.

> +	if (device->device_caps)
> +		device->device_caps(chan, caps);
> +
>  	return 0;

I dunno why this returns int, but either we get rid of this returned value
(perhaps in the future, b/c it's not directly related to this series), or
something like

	if (device->device_caps)
		return device->device_caps(chan, caps);

-- 
With Best Regards,
Andy Shevchenko