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

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Date:   Tue, 17 Jul 2018 13:00:29 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Rob Herring <robh@...nel.org>
Cc:     Vinod <vkoul@...nel.org>, 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

Hi,

Le lun. 16 juil. 2018 à 23:33, Rob Herring <robh@...nel.org> a écrit :
> 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.

You're right, I'll change that.

>> 
>>  >
>>  >  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