Move IRQ setup into a helper function. The string "GPIO" for error
messages is replaced with a label argument to prepare for reusing the
function for the I2C IRQ.

No functional change intended.

Co-developed-by: Gregor Herburger <gregor.herburger@tq-group.com>
Signed-off-by: Gregor Herburger <gregor.herburger@tq-group.com>
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
---

v2: no changes (was patch 2/4)
v3: no changes
v4: drop tqmx86_irq_to_irq_cfg() function, handle IRQ-to-register-value
    mapping in tqmx86_setup_irq() instead

 drivers/mfd/tqmx86.c | 59 +++++++++++++++++++++++++++-----------------
 1 file changed, 37 insertions(+), 22 deletions(-)

diff --git a/drivers/mfd/tqmx86.c b/drivers/mfd/tqmx86.c
index 7b2f9490a9af5..8aa448a67c9a5 100644
--- a/drivers/mfd/tqmx86.c
+++ b/drivers/mfd/tqmx86.c
@@ -186,33 +186,52 @@ static int tqmx86_board_id_to_clk_rate(struct device *dev, u8 board_id)
 	}
 }
 
-static int tqmx86_probe(struct platform_device *pdev)
+static int tqmx86_setup_irq(struct device *dev, const char *label, u8 irq,
+			    void __iomem *io_base, u8 reg_shift)
 {
-	u8 board_id, sauc, rev, i2c_det, io_ext_int_val;
-	struct device *dev = &pdev->dev;
-	u8 gpio_irq_cfg, readback;
-	const char *board_name;
-	void __iomem *io_base;
-	int err;
+	u8 val, readback;
+	int irq_cfg;
 
-	switch (gpio_irq) {
+	switch (irq) {
 	case 0:
-		gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_NONE;
+		irq_cfg = TQMX86_REG_IO_EXT_INT_NONE;
 		break;
 	case 7:
-		gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_7;
+		irq_cfg = TQMX86_REG_IO_EXT_INT_7;
 		break;
 	case 9:
-		gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_9;
+		irq_cfg = TQMX86_REG_IO_EXT_INT_9;
 		break;
 	case 12:
-		gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_12;
+		irq_cfg = TQMX86_REG_IO_EXT_INT_12;
 		break;
 	default:
-		pr_err("tqmx86: Invalid GPIO IRQ (%d)\n", gpio_irq);
+		dev_err(dev, "invalid %s IRQ (%d)\n", label, irq);
 		return -EINVAL;
 	}
 
+	val = ioread8(io_base + TQMX86_REG_IO_EXT_INT);
+	val &= ~(TQMX86_REG_IO_EXT_INT_MASK << reg_shift);
+	val |= (irq_cfg & TQMX86_REG_IO_EXT_INT_MASK) << reg_shift;
+
+	iowrite8(val, io_base + TQMX86_REG_IO_EXT_INT);
+	readback = ioread8(io_base + TQMX86_REG_IO_EXT_INT);
+	if (readback != val) {
+		dev_warn(dev, "%s interrupts not supported\n", label);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int tqmx86_probe(struct platform_device *pdev)
+{
+	u8 board_id, sauc, rev, i2c_det;
+	struct device *dev = &pdev->dev;
+	const char *board_name;
+	void __iomem *io_base;
+	int err;
+
 	io_base = devm_ioport_map(dev, TQMX86_IOBASE, TQMX86_IOSIZE);
 	if (!io_base)
 		return -ENOMEM;
@@ -233,15 +252,11 @@ static int tqmx86_probe(struct platform_device *pdev)
 	 */
 	i2c_det = inb(TQMX86_REG_I2C_DETECT);
 
-	if (gpio_irq_cfg) {
-		io_ext_int_val =
-			gpio_irq_cfg << TQMX86_REG_IO_EXT_INT_GPIO_SHIFT;
-		iowrite8(io_ext_int_val, io_base + TQMX86_REG_IO_EXT_INT);
-		readback = ioread8(io_base + TQMX86_REG_IO_EXT_INT);
-		if (readback != io_ext_int_val) {
-			dev_warn(dev, "GPIO interrupts not supported.\n");
-			return -EINVAL;
-		}
+	if (gpio_irq) {
+		err = tqmx86_setup_irq(dev, "GPIO", gpio_irq, io_base,
+				       TQMX86_REG_IO_EXT_INT_GPIO_SHIFT);
+		if (err)
+			return err;
 
 		/* Assumes the IRQ resource is first. */
 		tqmx_gpio_resources[0].start = gpio_irq;
-- 
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