linux-kernel - Re: [PATCH 2/8 v4] Documentation: bindings: dma: Add binding for dma-channel-mask

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Message-ID: <20190120110642.GT4635@vkoul-mobl>
Date:   Sun, 20 Jan 2019 16:36:42 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tanglei Han <hantanglei@...wei.com>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/8 v4] Documentation: bindings: dma: Add binding for
 dma-channel-mask

On 17-01-19, 09:43, John Stultz wrote:
> On Thu, Jan 17, 2019 at 9:08 AM Manivannan Sadhasivam
> <manivannan.sadhasivam@...aro.org> wrote:
> >
> > On Wed, Jan 16, 2019 at 09:10:23AM -0800, John Stultz wrote:
> > > Some dma channels can be reserved for secure mode or other
> > > hardware on the SoC, so provide a binding for a bitmask
> > > listing the available channels for the kernel to use.
> > >
> > > This follows the pre-existing bcm,dma-channel-mask binding.
> > >
> > > Cc: Vinod Koul <vkoul@...nel.org>
> > > Cc: Rob Herring <robh+dt@...nel.org>
> > > Cc: Mark Rutland <mark.rutland@....com>
> > > Cc: Tanglei Han <hantanglei@...wei.com>
> > > Cc: Zhuangluan Su <suzhuangluan@...ilicon.com>
> > > Cc: Ryan Grachek <ryan@...ted.us>
> > > Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > Cc: dmaengine@...r.kernel.org
> > > Cc: devicetree@...r.kernel.org
> > > Signed-off-by: John Stultz <john.stultz@...aro.org>
> > > ---
> > > v3: Renamed to hisi-dma-avail-chan
> > > v4: Reworked to generic dma-channel-mask
> > > ---
> > >  Documentation/devicetree/bindings/dma/dma.txt | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/dma/dma.txt b/Documentation/devicetree/bindings/dma/dma.txt
> > > index 6312fb0..eeb4e4d 100644
> > > --- a/Documentation/devicetree/bindings/dma/dma.txt
> > > +++ b/Documentation/devicetree/bindings/dma/dma.txt
> > > @@ -16,6 +16,9 @@ Optional properties:
> > >  - dma-channels:      Number of DMA channels supported by the controller.
> > >  - dma-requests:      Number of DMA request signals supported by the
> > >                       controller.
> > > +- dma-channel-mask:  Bitmask of available DMA channels in ascending order
> > > +                     that are not reserved by firmware and are available to
> > > +                     the kernel. i.e. first channel corresponds to LSB.
> >
> > A general assumption is, "dma-channel-mask" refers to the bit fields of
> > the channels which needs to be masked. But here, it refers to the channels
> > which are available. Doesn't it contradict?
> 
> Hrm. So while I can sort of understand the common usage of "mask" as
> to "hide", thus the desire to have a bitfield mean "the channels we
> hide" or "don't use", but in my experience bitmasking is more commonly
> used to keep only a portion of the the bits, so from that perspective
> its more intuitive that a mask be the channels we keep to use. So I'm
> not sure if your suggestion makes it more clear.
> 
> But I'm not very particular here, so I'll defer to others on this.

Given the context and documentation which explicitly says it is bitmask
of available channels, i think we are fine :)

-- 
~Vinod