linux-kernel - Re: [PATCH v3 11/12] dmaengine: fsl-edma: integrate v3 support

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Date:   Fri, 2 Jun 2023 17:39:40 -0400
From:   Frank Li <Frank.li@....com>
To:     Joy Zou <joy.zou@....com>
Cc:     "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peng Fan <peng.fan@....com>,
        Shenwei Wang <shenwei.wang@....com>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        Aisheng Dong <aisheng.dong@....com>
Subject: Re: [PATCH v3 11/12] dmaengine: fsl-edma: integrate v3 support

On Fri, Jun 02, 2023 at 09:41:19AM +0000, Joy Zou wrote:
> > +	.chreg_off = EDMA_TCD,
> > +	.chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
> >  	.flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32,
> >  	.setup_irq = fsl_edma2_irq_init,
> >  };
> > 
> > +static struct fsl_edma_drvdata imx8qm_data = {
> > +	.flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_PD
> > +		 | FSL_EDMA_DRV_EDMA3,
> > +	.chreg_space_sz = 0x10000,
> > +	.chreg_off = 0x10000,
> > +	.setup_irq = fsl_edma3_irq_init,
> > +};
> Hi frank,
> There are many dma controllers in imx8qm. But not all dma controllers support ch-mux.
> In addition, Imx93 edma v3 also doesn't support ch-mux.
> You can confirm with RM. Can we use the dts node property instead of drvdata flags? 
> BR
> Joy Zou
> > +

I tested all i.mx8qxp have not ch-mux. did you find any one have ch-mux at imx8qm?
I will remove FSL_EDMA_DRV_HAS_CHMUX at imx8qm and imx93 at next version.
It works just because dmamuxs is 0. ch-mux register have not written at all.

we have compatible string, which are enough to distinguish the difference.
not neccesary to add property for that.

Frank Li

> > --
> > 2.34.1
>