pinctrl: samsung: Use platform_get_irq_optional() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_optional().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20211224145748.18754-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index 8941f658e7f179a8dfc601f1ede58961003827cc..0f6e9305fec58c7bef531d8ff8714a2392f27cb3 100644 (file)
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -1095,7 +1095,6 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
        struct samsung_pinctrl_drv_data *drvdata;
        const struct samsung_pin_ctrl *ctrl;
        struct device *dev = &pdev->dev;
-       struct resource *res;
        int ret;
 
        drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
@@ -1109,9 +1108,11 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
        }
        drvdata->dev = dev;
 
-       res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-       if (res)
-               drvdata->irq = res->start;
+       ret = platform_get_irq_optional(pdev, 0);
+       if (ret < 0 && ret != -ENXIO)
+               return ret;
+       if (ret > 0)
+               drvdata->irq = ret;
 
        if (ctrl->retention_data) {
                drvdata->retention_ctrl = ctrl->retention_data->init(drvdata,