gpiolib: separation of pin concerns
The fact that of_gpiochip_add_pin_range() and
gpiochip_add_pin_range() share too much code is fragile and
will invariably mean that bugs need to be fixed in two places
instead of one.
So separate the concerns of gpiolib.c and gpiolib-of.c and
have the latter call the former as back-end. This is necessary
also when going forward with other device descriptions such
as ACPI.
This is done by:
- Adding a return code to gpiochip_add_pin_range() so we can
reliably check whether this succeeds.
- Get rid of the custom of_pinctrl_add_gpio_range() from
pinctrl. Instead create of_pinctrl_get() to just retrive the
pin controller per se from an OF node. This composite
function was just begging to be deleted, it was way to
purpose-specific.
- Use pinctrl_dev_get_name() to get the name of the retrieved
pin controller and use that to call back into the generic
gpiochip_add_pin_range().
Now the pin range is only allocated and tied to a pin
controller from the core implementation in gpiolib.c.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 67403e4..a40cd84 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -221,8 +221,8 @@
static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
{
struct device_node *np = chip->of_node;
- struct gpio_pin_range *pin_range;
struct of_phandle_args pinspec;
+ struct pinctrl_dev *pctldev;
int index = 0, ret;
if (!np)
@@ -234,22 +234,17 @@
if (ret)
break;
- pin_range = devm_kzalloc(chip->dev, sizeof(*pin_range),
- GFP_KERNEL);
- if (!pin_range) {
- pr_err("%s: GPIO chip: failed to allocate pin ranges\n",
- chip->label);
+ pctldev = of_pinctrl_get(pinspec.np);
+ if (!pctldev)
break;
- }
- pin_range->range.name = chip->label;
- pin_range->range.base = chip->base;
- pin_range->range.pin_base = pinspec.args[0];
- pin_range->range.npins = pinspec.args[1];
- pin_range->pctldev = of_pinctrl_add_gpio_range(pinspec.np,
- &pin_range->range);
+ ret = gpiochip_add_pin_range(chip,
+ pinctrl_dev_get_name(pctldev),
+ pinspec.args[0],
+ pinspec.args[1]);
- list_add_tail(&pin_range->node, &chip->pin_ranges);
+ if (ret)
+ break;
} while (index++);
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bcf9b99..c5f6500 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1187,8 +1187,8 @@
#ifdef CONFIG_PINCTRL
-void gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
- unsigned int pin_base, unsigned int npins)
+int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
+ unsigned int pin_base, unsigned int npins)
{
struct gpio_pin_range *pin_range;
@@ -1196,7 +1196,7 @@
if (!pin_range) {
pr_err("%s: GPIO chip: failed to allocate pin ranges\n",
chip->label);
- return;
+ return -ENOMEM;
}
pin_range->range.name = chip->label;
@@ -1207,6 +1207,8 @@
&pin_range->range);
list_add_tail(&pin_range->node, &chip->pin_ranges);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index 6728ec7..fe2d1af 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -106,8 +106,7 @@
return NULL;
}
-struct pinctrl_dev *of_pinctrl_add_gpio_range(struct device_node *np,
- struct pinctrl_gpio_range *range)
+struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
{
struct pinctrl_dev *pctldev;
@@ -115,7 +114,6 @@
if (!pctldev)
return NULL;
- pinctrl_add_gpio_range(pctldev, range);
return pctldev;
}