[PATCH v4 01/11] mfd: add pruss mfd driver.

[mkl@pengutronix.de (Marc Kleine-Budde)]

On 04/27/2011 03:18 PM, Subhasish Ghosh wrote:
> My problem is, I am doing something like this:
> 
> s32 pruss_writel_multi(struct device *dev, u32 offset,
>                u32 *pdatatowrite, u16 wordstowrite)
> {
>        struct pruss_priv *pruss = dev_get_drvdata(dev->parent);
>        u32 __iomem *paddresstowrite;
>        u16 i;
> 
>        paddresstowrite = pruss->ioaddr + offset;
> 
>        for (i = 0; i < wordstowrite; i++)
>                iowrite32(*pdatatowrite++, paddresstowrite++);
> 
>        return 0;
> }
> 
> So, if I make paddresstowrite as void, it will not work. The above
> implementation does not generate any sparse errors though.

Incrementing a u32 pointer will result in increasing the address by 4
bytes. Incrementing a void pointer will result in increasing the address
by just one byte. (Pointer arithmetic on void * is a gnu extension but
IMHO a pretty nice one, though)

regards, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20110427/d0a11efa/attachment.sig>