From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 2 Jun 2011 18:18:51 +0000 (+0100)
Subject: mfd: Support dynamic allocation of IRQ range for wm831x
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5c05a8d1f0105ada3cb04be5b70686fc6b272619;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

mfd: Support dynamic allocation of IRQ range for wm831x

Use irq_allocate_desc() to get the IRQ range, which turns into a noop on
non-sparse systems. Since all existing users are non-sparse there should
be no compatibility issues.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index b23d8d5ee96c..1808deb8083b 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -527,13 +527,22 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
 				 0xffff);
 	}
 
-	if (!pdata || !pdata->irq_base) {
-		dev_err(wm831x->dev,
-			"No interrupt base specified, no interrupts\n");
+	/* Try to dynamically allocate IRQs if no base is specified */
+	if (!pdata || !pdata->irq_base)
+		wm831x->irq_base = -1;
+	else
+		wm831x->irq_base = pdata->irq_base;
+
+	wm831x->irq_base = irq_alloc_descs(wm831x->irq_base, 0,
+					   WM831X_NUM_IRQS, 0);
+	if (wm831x->irq_base < 0) {
+		dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",
+			 wm831x->irq_base);
+		wm831x->irq_base = 0;
 		return 0;
 	}
 
-	if (pdata->irq_cmos)
+	if (pdata && pdata->irq_cmos)
 		i = 0;
 	else
 		i = WM831X_IRQ_OD;
@@ -553,7 +562,6 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
 	}
 
 	wm831x->irq = irq;
-	wm831x->irq_base = pdata->irq_base;
 
 	/* Register them with genirq */
 	for (cur_irq = wm831x->irq_base;
diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index ebead1c401aa..9564cf315276 100644
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -262,7 +262,7 @@ struct wm831x {
 
 	int irq;  /* Our chip IRQ */
 	struct mutex irq_lock;
-	unsigned int irq_base;
+	int irq_base;
 	int irq_masks_cur[WM831X_NUM_IRQ_REGS];   /* Currently active value */
 	int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */