[PATCH 4/6] spi: add Marvell MVEBU SoC SPI driver

[Sascha Hauer]

On Fri, Jun 28, 2013 at 08:25:45PM +0200, Sebastian Hesselbarth wrote:
> This adds support for the SPI controller found on Marvell MVEBU SoCs
> (Dove, Kirkwood, Discovery Innovation, and Armada 370/XP). Current driver
> is DT only. Compatible strings are provided for Orion (common denominator),
> Armada 370/XP and Dove SoCs.
> 
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>

Mostly good, some minor stuff inline.

> +static int mvebu_spi_set_transfer_size(struct mvebu_spi *p, int size)
> +{
> +	u32 val;
> +
> +	if (size != 8 && size != 16)
> +		return -EINVAL;
> +
> +	p->data16 = (size == 16);
> +
> +	val = readl(p->base + SPI_IF_CONFIG) & ~IF_TRANSFER_2BYTE;
> +	if (p->data16)
> +		val |= IF_TRANSFER_2BYTE;
> +	writel(val, p->base + SPI_IF_CONFIG);
> +	

Trailing whitespaces here and elsewhere.

> +	return 0;
> +}
> +
> +static int mvebu_spi_set_baudrate(struct mvebu_spi *p, u32 speed)
> +{
> +	u32 pscl, val;
> +
> +	/* standard prescaler values: 1,2,4,6,...,30 */
> +	pscl = DIV_ROUND_UP(clk_get_rate(p->clk), speed);
> +	pscl = roundup(pscl, 2);
> +
> +	debug("%s: clk = %lu, speed = %u, pscl = %d\n",
> +		__func__, clk_get_rate(p->clk), speed, pscl);

Please use dev_dbg and friends in drivers.

> +	int ret = 0;
> +
> +	match = of_match_node(mvebu_spi_dt_ids, dev->device_node);
> +	if (!match)
> +		return -EINVAL;
> +
> +	priv = xzalloc(sizeof(*priv));
> +	priv->base = dev_request_mem_region(dev, 0);

Please check priv->base for validity. I know, most other drivers also
don't do it, but at least new drivers should.

Sascha

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