linux-kernel - Re: [PATCH v2 6/7] dmaengine: fsl-edma: add i.mx7ulp edma2 version support

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Date:   Mon, 27 May 2019 10:04:52 +0000
From:   Robin Gong <yibin.gong@....com>
To:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [PATCH v2 6/7] dmaengine: fsl-edma: add i.mx7ulp edma2 version
 support

On 2019-05-27 at 11:05 +0200, Sascha Hauer wrote:
> On Mon, May 27, 2019 at 04:51:17PM +0800, yibin.gong@....com wrote:
> > 
> > From: Robin Gong <yibin.gong@....com>
> > 
> > +static const struct of_device_id fsl_edma_dt_ids[] = {
> > +	{ .compatible = "fsl,vf610-edma", .data = (void *)v1 },
> > +	{ .compatible = "fsl,imx7ulp-edma", .data = (void *)v3 },
> > +	{ /* sentinel */ }
> Please put a struct type behind the .data pointer so that you can
> configure...
But current only version needed, so I give up struct define....
> 
> > 
> > +};
> > +MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
> > +
> > @@ -218,6 +272,22 @@ static int fsl_edma_probe(struct
> > platform_device *pdev)
> >  	fsl_edma_setup_regs(fsl_edma);
> >  	regs = &fsl_edma->regs;
> >  
> > +	if (fsl_edma->version == v3) {
> > +		fsl_edma->dmamux_nr = 1;
> ...things like this...
Yes, dmamux_nr could be moved to struct at least.
> 
> > 
> > @@ -264,7 +334,11 @@ static int fsl_edma_probe(struct
> > platform_device *pdev)
> >  	}
> >  
> >  	edma_writel(fsl_edma, ~0, regs->intl);
> > -	ret = fsl_edma_irq_init(pdev, fsl_edma);
> > +
> > +	if (fsl_edma->version == v3)
> > +		ret = fsl_edma2_irq_init(pdev, fsl_edma);
> > +	else
> > +		ret = fsl_edma_irq_init(pdev, fsl_edma);
> ...and this one in that struct rather than littering the code more
> and
> more with such version tests.
Yes, such irq setup function could be moved to struct, thus, no version
test in this file. Will refine it in v3.
> 
> Sascha
>