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    SubjectRe: [PATCH] gpiolib: add gpio_lookup_chip() to get chip information for gpio
    On Fri, Jan 08, 2010 at 03:30:36PM +0800, Eric Miao wrote:
    > On Fri, Jan 8, 2010 at 2:32 PM, Ben Dooks <ben-linux@fluff.org> wrote:
    > > Add a call to get the 'struct gpio_chip' pointer for a given gpio, so
    > > that core implementations which want to use gpiolib gpio numbering for
    > > things like mux configuration can get back to the gpio_chip that they
    > > registered without having to have their own list of gpio.
    > >
    > > This is especially useful for the Samsung S3C64XX series where the GPIO
    > > bank sizes can vary from 32 down to 3, making it difficult to store an
    > > array to convert a number to chip.
    > >
    >
    > I think this is generally a good idea. Will most likely be useful to
    > pxa platforms as well. Not sure though if you want to export this
    > symbol as well since we do allow gpio chip drivers to be modules.

    Probably not, since all the gpio call methods pass gpio_chip as their
    first parameter. This is only in the case we want to use gpios for
    something other than in/out/irq.

    --
    Ben

    Q: What's a light-year?
    A: One-third less calories than a regular year.



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