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gpiolib: provide provision to register pin ranges

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pinctrl subsystem needs gpio chip base to prepare set of gpio
pin ranges, which a given pinctrl driver can handle. This is
important to handle pinctrl gpio request calls in order to
program a given pin properly for gpio operation.

As gpio base is allocated dynamically during gpiochip
registration, presently there exists no clean way to pass this
information to the pinctrl subsystem.

After few discussions from [1], it was concluded that may be
gpio controller reporting the pin range it supports, is a
better way than pinctrl subsystem directly registering it.

[1] http://comments.gmane.org/gmane.linux.ports.arm.kernel/184816

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
[Edited documentation a bit]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Shiraz Hashim 2012-10-27 15:21:36 +05:30 • committed by Linus Walleij
parent 7e10ee68f8
commit f23f1516b6
10 changed files with 251 additions and 0 deletions
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17
include/linux/pinctrl/pinctrl.h
View file

@ -136,6 +136,23 @@ extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
unsigned nranges);
extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range);
extern struct pinctrl_dev *find_pinctrl_and_add_gpio_range(const char *devname,
struct pinctrl_gpio_range *range);
#ifdef CONFIG_OF
extern struct pinctrl_dev *of_pinctrl_add_gpio_range(struct device_node *np,
struct pinctrl_gpio_range *range);
#else
static inline
struct pinctrl_dev *of_pinctrl_add_gpio_range(struct device_node *np,
struct pinctrl_gpio_range *range)
{
return NULL;
}
#endif /* CONFIG_OF */
extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
#else