linux-kernel - Re: [PATCH 05/14] dmaengine: dma-jz4780: Add support for the JZ4740 SoC

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Date:   Mon, 16 Jul 2018 15:33:39 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vinod <vkoul@...nel.org>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Daniel Silsby <dansilsby@...il.com>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...ux-mips.org
Subject: Re: [PATCH 05/14] dmaengine: dma-jz4780: Add support for the JZ4740
 SoC

On Mon, Jul 09, 2018 at 10:42:26PM +0530, Vinod wrote:
> On 03-07-18, 14:32, Paul Cercueil wrote:
> 
> >  enum jz_version {
> > +	ID_JZ4740,
> >  	ID_JZ4770,
> >  	ID_JZ4780,
> >  };
> > @@ -247,6 +248,7 @@ static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc)
> >  }
> >  
> >  static const unsigned int jz4780_dma_ord_max[] = {
> > +	[ID_JZ4740] = 5,
> >  	[ID_JZ4770] = 6,
> >  	[ID_JZ4780] = 7,
> >  };
> > @@ -801,11 +803,13 @@ static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
> >  }
> >  
> >  static const unsigned int jz4780_dma_nb_channels[] = {
> > +	[ID_JZ4740] = 6,
> >  	[ID_JZ4770] = 6,
> >  	[ID_JZ4780] = 32,
> >  };
> 
> I feel these should be done away with if we describe hardware in DT

The compatible property can imply things like this.

But how this is structured is a bit strange. Normally you have a per 
compatible struct with these as elements and the compatible matching 
selects the struct.

> 
> >  
> >  static const struct of_device_id jz4780_dma_dt_match[] = {
> > +	{ .compatible = "ingenic,jz4740-dma", .data = (void *)ID_JZ4740 },
> 
> adding .compatible should be the only thing required, if at all for this
> addition :)
> 
> -- 
> ~Vinod