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pinctrl: stm32: check irq controller availability at probe

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It is not guaranteed that the IRQ controller driver is probed before
the pin controller driver gets probed.
Considering this, check for the irq domain availability during probe
and return EPROBE_DEFER if needed.

Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Fabien Dessenne 2019-04-24 10:08:44 +02:00 committed by Linus Walleij
parent 264667112e
commit d86f4d71e4
1 changed files with 27 additions and 10 deletions
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37
drivers/pinctrl/stm32/pinctrl-stm32.c
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@ -1122,23 +1122,35 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
return 0;
}
static struct irq_domain *stm32_pctrl_get_irq_domain(struct device_node *np)
{
struct device_node *parent;
struct irq_domain *domain;
if (!of_find_property(np, "interrupt-parent", NULL))
return NULL;
parent = of_irq_find_parent(np);
if (!parent)
return ERR_PTR(-ENXIO);
domain = irq_find_host(parent);
if (!domain)
/* domain not registered yet */
return ERR_PTR(-EPROBE_DEFER);
return domain;
}
static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev,
struct stm32_pinctrl *pctl)
{
struct device_node *np = pdev->dev.of_node, *parent;
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct regmap *rm;
int offset, ret, i;
int mask, mask_width;
parent = of_irq_find_parent(np);
if (!parent)
return -ENXIO;
pctl->domain = irq_find_host(parent);
if (!pctl->domain)
return -ENXIO;
pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(pctl->regmap))
return PTR_ERR(pctl->regmap);
@ -1264,6 +1276,11 @@ int stm32_pctl_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, pctl);
/* check for IRQ controller (may require deferred probe) */
pctl->domain = stm32_pctrl_get_irq_domain(np);
if (IS_ERR(pctl->domain))
return PTR_ERR(pctl->domain);
/* hwspinlock is optional */
hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
if (hwlock_id < 0) {
@ -1294,7 +1311,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
return -EINVAL;
}
if (of_find_property(np, "interrupt-parent", NULL)) {
if (pctl->domain) {
ret = stm32_pctrl_dt_setup_irq(pdev, pctl);
if (ret)
return ret;