linux-kernel - [PATCH 1/2] mfd: palmas: provide irq flags through DT/platform data

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Date:	Wed, 27 Feb 2013 19:38:39 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	<sameo@...ux.intel.com>
CC:	<gg@...mlogic.co.uk>, <broonie@...nsource.wolfsonmicro.com>,
	<linux-kernel@...r.kernel.org>, <swarren@...dia.com>,
	<ian@...mlogic.co.uk>, Laxman Dewangan <ldewangan@...dia.com>
Subject: [PATCH 1/2] mfd: palmas: provide irq flags through DT/platform data

Currently driver sets the irq type to IRQF_TRIGGER_LOW which is
causing interrupt registration failure in ARM based SoCs as:
[    0.208479] genirq: Setting trigger mode 8 for irq 118 failed (gic_set_type+0x0/0xf0)
[    0.208513] dummy 0-0059: Failed to request IRQ 118: -22

Provide the irq flags through platform data if device is registered
through board file or get the irq type from DT node property in place
of hardcoding the irq flag in driver to support multiple platforms.

Also configure the device to generate the interrupt signal according to
flag type.

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
---
 drivers/mfd/palmas.c       |   42 +++++++++++++++++++++++++++++++++++++++---
 include/linux/mfd/palmas.h |    1 +
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
index bbdbc50..25f0eab 100644
--- a/drivers/mfd/palmas.c
+++ b/drivers/mfd/palmas.c
@@ -257,9 +257,24 @@ static struct regmap_irq_chip palmas_irq_chip = {
 			PALMAS_INT1_MASK),
 };
 
-static void palmas_dt_to_pdata(struct device_node *node,
+static int palmas_set_pdata_irq_flag(struct i2c_client *i2c,
 		struct palmas_platform_data *pdata)
 {
+	struct irq_data *irq_data = irq_get_irq_data(i2c->irq);
+	if (!irq_data) {
+		dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
+		return -EINVAL;
+	}
+
+	pdata->irq_flags = irqd_get_trigger_type(irq_data);
+	dev_info(&i2c->dev, "Irq flag is 0x%08x\n", pdata->irq_flags);
+	return 0;
+}
+
+static void palmas_dt_to_pdata(struct i2c_client *i2c,
+		struct palmas_platform_data *pdata)
+{
+	struct device_node *node = i2c->dev.of_node;
 	int ret;
 	u32 prop;
 
@@ -283,6 +298,8 @@ static void palmas_dt_to_pdata(struct device_node *node,
 		pdata->power_ctrl = PALMAS_POWER_CTRL_NSLEEP_MASK |
 					PALMAS_POWER_CTRL_ENABLE1_MASK |
 					PALMAS_POWER_CTRL_ENABLE2_MASK;
+	if (i2c->irq)
+		palmas_set_pdata_irq_flag(i2c, pdata);
 }
 
 static int palmas_i2c_probe(struct i2c_client *i2c,
@@ -304,7 +321,7 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
 		if (!pdata)
 			return -ENOMEM;
 
-		palmas_dt_to_pdata(node, pdata);
+		palmas_dt_to_pdata(i2c, pdata);
 	}
 
 	if (!pdata)
@@ -344,6 +361,25 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
 		}
 	}
 
+	/* Change interrupt line output polarity */
+	ret = palmas_read(palmas, PALMAS_PU_PD_OD_BASE,
+				PALMAS_POLARITY_CTRL, &reg);
+	if (ret < 0) {
+		dev_err(palmas->dev, "POLARITY_CTRL read failed: %d\n", ret);
+		goto err;
+	}
+
+	if (pdata->irq_flags & IRQ_TYPE_LEVEL_HIGH)
+		reg |= PALMAS_POLARITY_CTRL_INT_POLARITY;
+	else
+		reg &= ~PALMAS_POLARITY_CTRL_INT_POLARITY;
+	ret = palmas_write(palmas, PALMAS_PU_PD_OD_BASE,
+			PALMAS_POLARITY_CTRL, reg);
+	if (ret < 0) {
+		dev_err(palmas->dev, "POLARITY_CTRL write failed: %d\n", ret);
+		goto err;
+	}
+
 	/* Change IRQ into clear on read mode for efficiency */
 	slave = PALMAS_BASE_TO_SLAVE(PALMAS_INTERRUPT_BASE);
 	addr = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE, PALMAS_INT_CTRL);
@@ -352,7 +388,7 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
 	regmap_write(palmas->regmap[slave], addr, reg);
 
 	ret = regmap_add_irq_chip(palmas->regmap[slave], palmas->irq,
-			IRQF_ONESHOT | IRQF_TRIGGER_LOW, 0, &palmas_irq_chip,
+			IRQF_ONESHOT | pdata->irq_flags, 0, &palmas_irq_chip,
 			&palmas->irq_data);
 	if (ret < 0)
 		goto err;
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index a4d13d7..3bbda22 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -221,6 +221,7 @@ struct palmas_clk_platform_data {
 };
 
 struct palmas_platform_data {
+	int irq_flags;
 	int gpio_base;
 
 	/* bit value to be loaded to the POWER_CTRL register */
-- 
1.7.1.1

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