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gpio: aggregator: refactor the code to add GPIO desc in the forwarder

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Create a dedicated function to add a GPIO desc in the forwarder. Instead of
saving a GPIO descs array pointer, now the GPIO descs are passed one by one
to the forwarder which registers them in its own array. So after the call
of gpiochip_fwd_create(), the passed array can be free.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20250811-aaeon-up-board-pinctrl-support-v9-3-29f0cbbdfb30@bootlin.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Thomas Richard 2025-08-11 15:25:46 +02:00 committed by Bartosz Golaszewski
parent 871c7cd548
commit c44ce91b8a
1 changed files with 40 additions and 19 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

59
drivers/gpio/gpio-aggregator.c
View file

@ -485,6 +485,10 @@ devm_gpiochip_fwd_alloc(struct device *dev, unsigned int ngpios)
if (!fwd)
return ERR_PTR(-ENOMEM);
fwd->descs = devm_kcalloc(dev, ngpios, sizeof(*fwd->descs), GFP_KERNEL);
if (!fwd->descs)
return ERR_PTR(-ENOMEM);
chip = &fwd->chip;
chip->label = dev_name(dev);
@ -504,13 +508,43 @@ devm_gpiochip_fwd_alloc(struct device *dev, unsigned int ngpios)
return fwd;
}
static int gpiochip_fwd_desc_add(struct gpiochip_fwd *fwd,
struct gpio_desc *desc,
unsigned int offset)
{
struct gpio_chip *parent = gpiod_to_chip(desc);
struct gpio_chip *chip = &fwd->chip;
if (offset > chip->ngpio)
return -EINVAL;
/*
* If any of the GPIO lines are sleeping, then the entire forwarder
* will be sleeping.
* If any of the chips support .set_config(), then the forwarder will
* support setting configs.
*/
if (gpiod_cansleep(desc))
chip->can_sleep = true;
if (parent && parent->set_config)
chip->set_config = gpio_fwd_set_config;
fwd->descs[offset] = desc;
dev_dbg(chip->parent, "%u => gpio %d irq %d\n", offset,
desc_to_gpio(desc), gpiod_to_irq(desc));
return 0;
}
/**
* gpiochip_fwd_create() - Create a new GPIO forwarder
* @dev: Parent device pointer
* @ngpios: Number of GPIOs in the forwarder.
* @descs: Array containing the GPIO descriptors to forward to.
* This array must contain @ngpios entries, and must not be deallocated
* before the forwarder has been destroyed again.
* This array must contain @ngpios entries, and can be deallocated
* as the forwarder has its own array.
* @features: Bitwise ORed features as defined with FWD_FEATURE_*.
*
* This function creates a new gpiochip, which forwards all GPIO operations to
@ -535,26 +569,12 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
chip = &fwd->chip;
/*
* If any of the GPIO lines are sleeping, then the entire forwarder
* will be sleeping.
* If any of the chips support .set_config(), then the forwarder will
* support setting configs.
*/
for (i = 0; i < ngpios; i++) {
struct gpio_chip *parent = gpiod_to_chip(descs[i]);
dev_dbg(dev, "%u => gpio %d irq %d\n", i,
desc_to_gpio(descs[i]), gpiod_to_irq(descs[i]));
if (gpiod_cansleep(descs[i]))
chip->can_sleep = true;
if (parent && parent->set_config)
chip->set_config = gpio_fwd_set_config;
error = gpiochip_fwd_desc_add(fwd, descs[i], i);
if (error)
return ERR_PTR(error);
}
fwd->descs = descs;
if (chip->can_sleep)
mutex_init(&fwd->mlock);
else
@ -1348,6 +1368,7 @@ static int gpio_aggregator_probe(struct platform_device *pdev)
return PTR_ERR(fwd);
platform_set_drvdata(pdev, fwd);
devm_kfree(dev, descs);
return 0;
}