linux-kernel - Re: [PATCH v9 1/3] dmaengine: ptdma: Initial driver for the AMD PTDMA

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Message-ID: <YMl6zpjVHls8bk/A@vkoul-mobl>
Date:   Wed, 16 Jun 2021 09:45:10 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Sanjay R Mehta <sanmehta@....com>
Cc:     Sanjay R Mehta <Sanju.Mehta@....com>, gregkh@...uxfoundation.org,
        dan.j.williams@...el.com, Thomas.Lendacky@....com,
        Shyam-sundar.S-k@....com, Nehal-bakulchandra.Shah@....com,
        robh@...nel.org, mchehab+samsung@...nel.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v9 1/3] dmaengine: ptdma: Initial driver for the AMD PTDMA

On 15-06-21, 16:50, Sanjay R Mehta wrote:

> >> +static struct pt_device *pt_alloc_struct(struct device *dev)
> >> +{
> >> +     struct pt_device *pt;
> >> +
> >> +     pt = devm_kzalloc(dev, sizeof(*pt), GFP_KERNEL);
> >> +
> >> +     if (!pt)
> >> +             return NULL;
> >> +     pt->dev = dev;
> >> +     pt->ord = atomic_inc_return(&pt_ordinal);
> > 
> > What is the use of this number?
> > 
> 
> There are eight similar instances of this DMA engine on AMD SOC.
> It is to differentiate each of these instances.

Are they individual device objects?

-- 
~Vinod