Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux

Pull GPIO regression fix from Grant Likely:
 "It took a while to work out the correct solution to this regression.
  It is sorted now.  This branch was constructed and tested by Tony.
  I've verified that it builds and signed the tag"

* tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux:
  gpio/omap: don't use linear domain mapping for OMAP1

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index d3f7d2db870f..4a430360af5a 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -1094,6 +1094,9 @@ static int omap_gpio_probe(struct platform_device *pdev)
         const struct omap_gpio_platform_data *pdata;
         struct resource *res;
         struct gpio_bank *bank;
+#ifdef CONFIG_ARCH_OMAP1
+        int irq_base;
+#endif
 
         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
 
@@ -1135,11 +1138,28 @@ static int omap_gpio_probe(struct platform_device *pdev)
                                 pdata->get_context_loss_count;
         }
 
+#ifdef CONFIG_ARCH_OMAP1
+        /*
+         * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
+         * irq_alloc_descs() and irq_domain_add_legacy() and just use a
+         * linear IRQ domain mapping for all OMAP platforms.
+         */
+        irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
+        if (irq_base < 0) {
+                dev_err(dev, "Couldn't allocate IRQ numbers\n");
+                return -ENODEV;
+        }
 
+        bank->domain = irq_domain_add_legacy(node, bank->width, irq_base,
+                                             0, &irq_domain_simple_ops, NULL);
+#else
         bank->domain = irq_domain_add_linear(node, bank->width,
                                              &irq_domain_simple_ops, NULL);
-        if (!bank->domain)
+#endif
+        if (!bank->domain) {
+                dev_err(dev, "Couldn't register an IRQ domain\n");
                 return -ENODEV;
+        }
 
         if (bank->regs->set_dataout && bank->regs->clr_dataout)
                 bank->set_dataout = _set_gpio_dataout_reg;