On Fri, 2 Mar 2012 10:08:48 -0800, Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> * Tony Lindgren <tony@xxxxxxxxxxx> [120302 08:31]:
> > * Grant Likely <grant.likely@xxxxxxxxxxxx> [120302 01:00]:
> > > On Thu, 01 Mar 2012 10:55:24 -0800, Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> > > > +
> > > > +/**
> > > > + * gpiochip_find_by_name() - iterator for locating a gpio_chip by name
> > > > + * @name: name of the gpio_chip
> > > > + *
> > > > + * Similar to bus_find_device_by_name. It returns a reference to the
> > > > + * first gpio_chip with matching name. It ignores NULL and empty names.
> > > > + * If you need to do something more complex, then use gpiochip_find.
> > > > + */
> > > > +struct gpio_chip *gpiochip_find_by_name(const char *name)
> > > > +{
> > > > + if (!name || !strcmp(name, ""))
> > > > + return NULL;
> > > > +
> > > > + return gpiochip_find((void *)name, match_name);
> > >
> > > Nasty cast. Can the signature for gpiochip_find be changed to accept
> > > a (const void *)?
> >
> > I think so, this too comes from the bus code.
>
> Looks like it can't be const as of_node_to_gpiochip uses it with
> a struct device_node * that for of_get_named_gpio_flags comes from
> of_parse_phandle_with_args.
Really? It sees to work fine here:
---
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index d773540..e633a2a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1152,8 +1152,9 @@ EXPORT_SYMBOL_GPL(gpiochip_remove);
* non-zero, this function will return to the caller and not iterate over any
* more gpio_chips.
*/
-struct gpio_chip *gpiochip_find(void *data,
- int (*match)(struct gpio_chip *chip, void *data))
+struct gpio_chip *gpiochip_find(const void *data,
+ int (*match)(struct gpio_chip *chip,
+ const void *data))
{
struct gpio_chip *chip = NULL;
unsigned long flags;
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index e034b38..bba8121 100644
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -229,7 +229,7 @@ void of_gpiochip_remove(struct gpio_chip *chip)
}
/* Private function for resolving node pointer to gpio_chip */
-static int of_gpiochip_is_match(struct gpio_chip *chip, void *data)
+static int of_gpiochip_is_match(struct gpio_chip *chip, const void *data)
{
return chip->of_node == data;
}
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 1ff4e22..5f52690 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -142,9 +142,9 @@ extern int __must_check gpiochip_reserve(int start, int ngpio);
/* add/remove chips */
extern int gpiochip_add(struct gpio_chip *chip);
extern int __must_check gpiochip_remove(struct gpio_chip *chip);
-extern struct gpio_chip *gpiochip_find(void *data,
+extern struct gpio_chip *gpiochip_find(const void *data,
int (*match)(struct gpio_chip *chip,
- void *data));
+ const void *data));
/* Always use the library code for GPIO management calls,
--
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