From f23f1516b6757c326cc638bed8c402c77e2a596e Mon Sep 17 00:00:00 2001 From: Shiraz Hashim Date: Sat, 27 Oct 2012 15:21:36 +0530 Subject: gpiolib: provide provision to register pin ranges 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 Signed-off-by: Viresh Kumar Signed-off-by: Shiraz Hashim [Edited documentation a bit] Signed-off-by: Linus Walleij --- include/linux/gpio.h | 3 +++ include/linux/pinctrl/pinctrl.h | 17 +++++++++++++++++ 2 files changed, 20 insertions(+) (limited to 'include/linux') diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 2e31e8b3a190..a28445992b7f 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -231,6 +231,9 @@ static inline int irq_to_gpio(unsigned irq) return -EINVAL; } +void gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, + unsigned int pin_base, unsigned int npins); +void gpiochip_remove_pin_ranges(struct gpio_chip *chip); #endif #endif /* __LINUX_GPIO_H */ diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h index eda04674633d..434e5a94e131 100644 --- a/include/linux/pinctrl/pinctrl.h +++ b/include/linux/pinctrl/pinctrl.h @@ -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 -- cgit v1.2.3