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pinctrl: bcm2835: Change init order for gpio hogs 

...and gpio-ranges

pinctrl-bcm2835 is a combined pinctrl/gpio driver. Currently the gpio
side is registered first, but this breaks gpio hogs (which are
configured during gpiochip_add_data). Part of the hog initialisation
is a call to pinctrl_gpio_request, and since the pinctrl driver hasn't
yet been registered this results in an -EPROBE_DEFER from which it can
never recover.

Change the initialisation sequence to register the pinctrl driver
first.

This also solves a similar problem with the gpio-ranges property, which
is required in order for released pins to be returned to inputs.

Fixes: 73345a18d4 ("pinctrl: bcm2835: Pass irqchip when adding gpiochip")
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20211206092237.4105895-2-phil@raspberrypi.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Phil Elwell 2021-12-06 09:22:36 +00:00 committed by Linus Walleij
parent 2d5446da5a
commit 266423e60e
1 changed files with 16 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/pinctrl/bcm/pinctrl-bcm2835.c
View File

@ -1244,6 +1244,18 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
raw_spin_lock_init(&pc->irq_lock[i]);
}
pc->pctl_desc = *pdata->pctl_desc;
pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
if (IS_ERR(pc->pctl_dev)) {
gpiochip_remove(&pc->gpio_chip);
return PTR_ERR(pc->pctl_dev);
}
pc->gpio_range = *pdata->gpio_range;
pc->gpio_range.base = pc->gpio_chip.base;
pc->gpio_range.gc = &pc->gpio_chip;
pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
girq = &pc->gpio_chip.irq;
girq->chip = &bcm2835_gpio_irq_chip;
girq->parent_handler = bcm2835_gpio_irq_handler;
@ -1251,8 +1263,10 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
girq->parents = devm_kcalloc(dev, BCM2835_NUM_IRQS,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
if (!girq->parents) {
pinctrl_remove_gpio_range(pc->pctl_dev, &pc->gpio_range);
return -ENOMEM;
}
if (is_7211) {
pc->wake_irq = devm_kcalloc(dev, BCM2835_NUM_IRQS,
@ -1307,21 +1321,10 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
err = gpiochip_add_data(&pc->gpio_chip, pc);
if (err) {
dev_err(dev, "could not add GPIO chip\n");
pinctrl_remove_gpio_range(pc->pctl_dev, &pc->gpio_range);
return err;
}
pc->pctl_desc = *pdata->pctl_desc;
pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
if (IS_ERR(pc->pctl_dev)) {
gpiochip_remove(&pc->gpio_chip);
return PTR_ERR(pc->pctl_dev);
}
pc->gpio_range = *pdata->gpio_range;
pc->gpio_range.base = pc->gpio_chip.base;
pc->gpio_range.gc = &pc->gpio_chip;
pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
return 0;
}