On Fri, Oct 23, 2015 at 5:53 AM, Yuan Yao <yao.yuan@freescale.com> wrote:

>  /*
> + * R/W functions for big- or little-endian registers:
> + * The qSPI controller's endian is independent of the CPU core's endian.
> + * So far, although the CPU core is little-endian but the qSPI have two
> + * versions for big-endian and little-endian.
> + */
> +static void qspi_writel(struct fsl_qspi *q, u32 val, void __iomem *addr)
> +{
> +       if (q->big_endian)
> +               iowrite32be(val, addr);
> +       else
> +               iowrite32(val, addr);
> +}

I suggest you to implement regmap support for this driver instead.

Take a look at drivers/watchdog/imx2_wdt.c for a reference.

Then you only need to pass 'big-endian' as a property for the qspi in
the .dtsi file and regmap core will take care of endianness.