gpio-langwell: fix irq conflicts when DT is not used

When DT is not used IOAPIC does not register irq domain. As result
IOAPIC won't care about gpio-langwell's virq and may cause conflict if
an irq number is equal to gpio-langwell's virq mapped beforehand.

This patch tells gpio_langwell to not ignore irq_base if != 0 and
preferably use it to avoid the conflict.

If DT is used, irq_base can safely be 0.

Signed-off-by: David Cohen <david.a.cohen@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index 634c3d3..62ef10a 100644 (file)
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -324,6 +324,7 @@ static int lnw_gpio_probe(struct pci_dev *pdev,
        resource_size_t start, len;
        struct lnw_gpio *lnw;
        u32 gpio_base;
+       u32 irq_base;
        int retval;
        int ngpio = id->driver_data;
 
@@ -345,6 +346,7 @@ static int lnw_gpio_probe(struct pci_dev *pdev,
                retval = -EFAULT;
                goto err_ioremap;
        }
+       irq_base = *(u32 *)base;
        gpio_base = *((u32 *)base + 1);
        /* release the IO mapping, since we already get the info from bar1 */
        iounmap(base);
@@ -365,13 +367,6 @@ static int lnw_gpio_probe(struct pci_dev *pdev,
                goto err_ioremap;
        }
 
-       lnw->domain = irq_domain_add_linear(pdev->dev.of_node, ngpio,
-                                           &lnw_gpio_irq_ops, lnw);
-       if (!lnw->domain) {
-               retval = -ENOMEM;
-               goto err_ioremap;
-       }
-
        lnw->reg_base = base;
        lnw->chip.label = dev_name(&pdev->dev);
        lnw->chip.request = lnw_gpio_request;
@@ -384,6 +379,14 @@ static int lnw_gpio_probe(struct pci_dev *pdev,
        lnw->chip.ngpio = ngpio;
        lnw->chip.can_sleep = 0;
        lnw->pdev = pdev;
+
+       lnw->domain = irq_domain_add_simple(pdev->dev.of_node, ngpio, irq_base,
+                                           &lnw_gpio_irq_ops, lnw);
+       if (!lnw->domain) {
+               retval = -ENOMEM;
+               goto err_ioremap;
+       }
+
        pci_set_drvdata(pdev, lnw);
        retval = gpiochip_add(&lnw->chip);
        if (retval) {