mfd: Allocate wm835x irq descs dynamically

This allows boards to leave the irq_base field unitialized and
prevents them having to reserve irqs in the platform.
pdata can be optional for irq support now. Without pdata the
driver allocates some free irq range. With pdata and irq_base > 0
the driver allocates exactly the specified irq.
Without pdata the irq defaults to IRQF_TRIGGER_LOW.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/wm8350-irq.c b/drivers/mfd/wm8350-irq.c
index ed4b22a167b30104d3628bed7d3ee34753dd867b..8a1fafd0bf7d129184e8910b73a0848954dcf42c 100644 (file)
--- a/drivers/mfd/wm8350-irq.c
+++ b/drivers/mfd/wm8350-irq.c
@@ -473,17 +473,13 @@ int wm8350_irq_init(struct wm8350 *wm8350, int irq,
 {
        int ret, cur_irq, i;
        int flags = IRQF_ONESHOT;
+       int irq_base = -1;
 
        if (!irq) {
                dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
                return 0;
        }
 
-       if (!pdata || !pdata->irq_base) {
-               dev_warn(wm8350->dev, "No interrupt support, no IRQ base\n");
-               return 0;
-       }
-
        /* Mask top level interrupts */
        wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);
 
@@ -502,7 +498,17 @@ int wm8350_irq_init(struct wm8350 *wm8350, int irq,
        wm8350->chip_irq = irq;
        wm8350->irq_base = pdata->irq_base;
 
-       if (pdata->irq_high) {
+       if (pdata && pdata->irq_base > 0)
+               irq_base = pdata->irq_base;
+
+       wm8350->irq_base = irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0);
+       if (wm8350->irq_base < 0) {
+               dev_warn(wm8350->dev, "Allocating irqs failed with %d\n",
+                       wm8350->irq_base);
+               return 0;
+       }
+
+       if (pdata && pdata->irq_high) {
                flags |= IRQF_TRIGGER_HIGH;
 
                wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,