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pinctrl: add pin list based GPIO ranges

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Traditionally, GPIO ranges are based on consecutive ranges of both GPIO
and pin numbers. This patch allows for GPIO ranges with arbitrary lists
of pin numbers.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Christian Ruppert 2013-06-13 14:55:31 +02:00 committed by Linus Walleij
parent 5ace03fb6a
commit c8587eeef8
2 changed files with 52 additions and 11 deletions
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47
drivers/pinctrl/core.c
View File

@ -282,6 +282,29 @@ static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
return 0;
}
/**
* gpio_to_pin() - GPIO range GPIO number to pin number translation
* @range: GPIO range used for the translation
* @gpio: gpio pin to translate to a pin number
*
* Finds the pin number for a given GPIO using the specified GPIO range
* as a base for translation. The distinction between linear GPIO ranges
* and pin list based GPIO ranges is managed correctly by this function.
*
* This function assumes the gpio is part of the specified GPIO range, use
* only after making sure this is the case (e.g. by calling it on the
* result of successful pinctrl_get_device_gpio_range calls)!
*/
static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
unsigned int gpio)
{
unsigned int offset = gpio - range->base;
if (range->pins)
return range->pins[offset];
else
return range->pin_base + offset;
}
/**
* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
* @pctldev: pin controller device to check
@ -448,7 +471,13 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (pin >= range->pin_base &&
if (range->pins) {
int a;
for (a = 0; a < range->npins; a++) {
if (range->pins[a] == pin)
return range;
}
} else if (pin >= range->pin_base &&
pin < range->pin_base + range->npins) {
mutex_unlock(&pctldev->mutex);
return range;
@ -529,7 +558,7 @@ int pinctrl_request_gpio(unsigned gpio)
}
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
pin = gpio_to_pin(range, gpio);
ret = pinmux_request_gpio(pctldev, range, pin, gpio);
@ -559,7 +588,7 @@ void pinctrl_free_gpio(unsigned gpio)
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
pin = gpio_to_pin(range, gpio);
pinmux_free_gpio(pctldev, pin, range);
@ -582,7 +611,7 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
pin = gpio_to_pin(range, gpio);
ret = pinmux_gpio_direction(pctldev, range, pin, input);
mutex_unlock(&pctldev->mutex);
@ -1349,6 +1378,16 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
if (range->pins) {
int a;
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
range->id, range->name,
range->base, (range->base + range->npins - 1));
for (a = 0; a < range->npins - 1; a++)
seq_printf(s, "%u, ", range->pins[a]);
seq_printf(s, "%u}\n", range->pins[a]);
}
else
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
range->id, range->name,
range->base, (range->base + range->npins - 1),

4
include/linux/pinctrl/pinctrl.h
View File

@ -49,7 +49,8 @@ struct pinctrl_pin_desc {
* @name: a name for the chip in this range
* @id: an ID number for the chip in this range
* @base: base offset of the GPIO range
* @pin_base: base pin number of the GPIO range
* @pin_base: base pin number of the GPIO range if pins != NULL
* @pins: enumeration of pins in GPIO range or NULL
* @npins: number of pins in the GPIO range, including the base number
* @gc: an optional pointer to a gpio_chip
*/
@ -59,6 +60,7 @@ struct pinctrl_gpio_range {
unsigned int id;
unsigned int base;
unsigned int pin_base;
unsigned const *pins;
unsigned int npins;
struct gpio_chip *gc;
};