[PATCH 2/2] imx25: imx_spi: support CSPI v0.7 as found on i.MX25

[Sascha Hauer]

On Tue, Aug 30, 2011 at 10:30:51AM +0400, Paul Fertser wrote:
> +
> +#if 0
> +/* MX1, MX31, MX35, MX51 CSPI */
> +static unsigned int spi_imx_clkdiv_2(unsigned int fin,
> +		unsigned int fspi)
> +{
> +	int i, div = 4;
> +
> +	for (i = 0; i < 7; i++) {
> +		if (fspi * div >= fin)
> +			return i;
> +		div <<= 1;
> +	}
> +
> +	return 7;
> +}
> +#endif
> +
> +static void cspi_0_7_chipselect(struct spi_device *spi, int is_active)
> +{
> +	struct spi_master *master = spi->master;
> +	struct imx_spi *imx = container_of(master, struct imx_spi, master);
> +	void __iomem *base = imx->regs;
> +	unsigned int cs = 0;
> +	int gpio = imx->cs_array[spi->chip_select];
> +	unsigned int reg = CSPI_0_7_CTRL_ENABLE | CSPI_0_7_CTRL_MASTER;
> +
> +	if (spi->mode & SPI_CS_HIGH)
> +		cs = 1;
> +
> +	if (!is_active) {
> +		if (gpio >= 0)
> +			gpio_set_value(gpio, !cs);
> +		return;
> +	}
> +
> +#if 0
> +	reg |= spi_imx_clkdiv_2(166000000, spi->max_speed_hz) <<
> +	  CSPI_0_7_CTRL_DR_SHIFT;
> +#endif
> +	reg |= 7 << CSPI_0_7_CTRL_DR_SHIFT; /* slowest speed */

Can we fix this before merging it? Are there any problems with faster
speeds?

Sascha


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