Re: [RFC/RFT 1/2] gpio/basic_mmio: add support for enable register

[Ryan Mallon]

On 05/07/11 15:10, Sekhar Nori wrote:
> Some GPIO controllers have an enable register
> which needs to be written to before a GPIO
> can be used.
>
> Add support for enabling the GPIO. At this
> time inverted logic for enabling the GPIO
> is not supported. This can be done by adding
> a disable register as and when a controller
> with this comes along.
>
> Signed-off-by: Sekhar Nori<nsekhar@xxxxxx>
> ---
<snip>

> static int bgpio_setup_io(struct bgpio_chip *bgc,
>   			  void __iomem *dat,
> @@ -369,6 +401,7 @@ int __devinit bgpio_init(struct bgpio_chip *bgc,
>   			 void __iomem *clr,
>   			 void __iomem *dirout,
>   			 void __iomem *dirin,
> +			 void __iomem *en,
>   			 bool big_endian)

The arguments to this function are getting a bit unwieldy :-). Maybe we 
need to introduce something like:

struct bgpio_chip_info {
    struct device *dev;
    unsigned long sz;
    void __iomem *dat;
    void __iomem *set;
    void __iomem *clr;
    void __iomem *dirout;
    void __iomem *dirin;
    void __iomem *en;
    bool big_endian;
};

and pass that to bgpio_init instead. It would have the added benefits of 
making the drivers more readable and that bgpio_chip_info structs in the 
drivers can probably be marked __initdata also.

Since you are already having to touch all of the call sites for 
bgpio_init this could be done as a separate patch along with this series.

~Ryan

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/