gpio/omap: don't use linear domain mapping for OMAP1

Commit ede4d7a5 ("gpio/omap: convert gpio irq domain to linear mapping")
converted the OMAP GPIO driver to use a linear mapping for the GPIO IRQ
domain instead of using a legacy mapping. Not using a legacy mapping has
a number of benefits but it requires the platform to support SPARSE_IRQ
which currently is not supported on OMAP1.

So this change caused a regression on OMAP1 platforms [1].

Since this issue is not present on all OMAP2+ platforms, there is no need to
revert the driver to use legacy domain mapping for all the platforms.

[1]: http://www.mail-archive.com/linux-omap@vger.kernel.org/msg89005.html

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>

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;