linux-kernel - Re: [PATCH v5] spi: spi-imx: add DMA support

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Date:	Wed, 10 Sep 2014 09:46:04 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Robin Gong <b38343@...escale.com>,
	linux-arm-kernel@...ts.infradead.org, broonie@...nel.org
CC:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	marex@...x.de, shawn.guo@...aro.org, Frank.Li@...escale.com
Subject: Re: [PATCH v5] spi: spi-imx: add DMA support

On 09/10/2014 07:00 AM, Robin Gong wrote:
> Enable DMA support on i.mx6. The read speed can increase from 600KB/s
> to 1.2MB/s on i.mx6q. You can disable or enable dma function in dts.

(...)

> +
> +static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
> +			     struct spi_master *master,
> +			     const struct resource *res)
> +{
> +	struct dma_slave_config slave_config = {};
> +	int ret;
> +
> +	/* Prepare for TX DMA: */
> +	master->dma_tx = dma_request_slave_channel(dev, "tx");
> +	if (!master->dma_tx) {
> +		dev_err(dev, "cannot get the TX DMA channel!\n");
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	slave_config.direction = DMA_MEM_TO_DEV;
> +	slave_config.dst_addr = res->start + MXC_CSPITXDATA;
> +	slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> +	slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
> +	ret = dmaengine_slave_config(master->dma_tx, &slave_config);
> +	if (ret) {
> +		dev_err(dev, "error in TX dma configuration.");
> +		

Missed terminating new line..

-- 
Regards,
Varka Bhadram.

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