linux-kernel - Re: [PATCH v5 07/11] dmaengine: sun6i: Retrieve channel count/max request from devicetree

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Date:   Mon, 23 Oct 2017 11:45:09 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Stefan Brüns <stefan.bruens@...h-aachen.de>
Cc:     linux-sunxi@...glegroups.com, devicetree@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>,
        linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Rob Herring <robh+dt@...nel.org>, dmaengine@...r.kernel.org,
        Code Kipper <codekipper@...il.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 07/11] dmaengine: sun6i: Retrieve channel count/max
 request from devicetree

On Tue, Oct 17, 2017 at 01:06:34AM +0200, Stefan Brüns wrote:
> To avoid introduction of a new compatible for each small SoC/DMA controller
> variation, move the definition of the channel count to the devicetree.
> 
> The number of vchans is no longer explicit, but limited by the highest
> port/DMA request number. The result is a slight overallocation for SoCs
> with a sparse port mapping.

Applied, thanks. But ...


>  static int sun6i_dma_probe(struct platform_device *pdev)
>  {
> +	struct device_node *np = pdev->dev.of_node;
>  	struct sun6i_dma_dev *sdc;
>  	struct resource *res;
>  	int ret, i;
> @@ -1228,6 +1233,26 @@ static int sun6i_dma_probe(struct platform_device *pdev)
>  	sdc->num_vchans = sdc->cfg->nr_max_vchans;
>  	sdc->max_request = sdc->cfg->nr_max_requests;
>  
> +	ret = of_property_read_u32(np, "dma-channels", &sdc->num_pchans);
> +	if (ret && !sdc->num_pchans) {
> +		dev_err(&pdev->dev, "Can't get dma-channels.\n");
> +		return ret;
> +	}

 ... we should probably use device_read_xxx calls instead of of_xxx

-- 
~Vinod