Add support for SMBus alert mechanism to i2c-xlp9xx driver.
The second interrupt is parsed to use for SMBus alert.
The first interrupt is the i2c controller main interrupt.

Signed-off-by: Kamlakant Patel <kamlakant.pa...@cavium.com>
Signed-off-by: George Cherian <george.cher...@cavium.com>
Reviewed-by: Jan Glauber <jglau...@cavium.com>
---
 drivers/i2c/busses/i2c-xlp9xx.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index eb8913e..fe54512 100644
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -10,6 +10,7 @@
 #include <linux/clk.h>
 #include <linux/completion.h>
 #include <linux/i2c.h>
+#include <linux/i2c-smbus.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -84,6 +85,8 @@ struct xlp9xx_i2c_dev {
        struct device *dev;
        struct i2c_adapter adapter;
        struct completion msg_complete;
+       struct i2c_smbus_alert_setup alert_data;
+       struct i2c_client *ara;
        int irq;
        bool msg_read;
        bool len_recv;
@@ -447,6 +450,19 @@ static int xlp9xx_i2c_get_frequency(struct platform_device 
*pdev,
        return 0;
 }
 
+static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
+                                 struct platform_device *pdev)
+{
+       if (!priv->alert_data.irq)
+               return -EINVAL;
+
+       priv->ara = i2c_setup_smbus_alert(&priv->adapter, &priv->alert_data);
+       if (!priv->ara)
+               return -ENODEV;
+
+       return 0;
+}
+
 static int xlp9xx_i2c_probe(struct platform_device *pdev)
 {
        struct xlp9xx_i2c_dev *priv;
@@ -467,6 +483,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
                dev_err(&pdev->dev, "invalid irq!\n");
                return priv->irq;
        }
+       /* SMBAlert irq */
+       priv->alert_data.irq = platform_get_irq(pdev, 1);
+       if (priv->alert_data.irq <= 0)
+               priv->alert_data.irq = 0;
 
        xlp9xx_i2c_get_frequency(pdev, priv);
        xlp9xx_i2c_init(priv);
@@ -493,6 +513,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
        if (err)
                return err;
 
+       err = xlp9xx_i2c_smbus_setup(priv, pdev);
+       if (err)
+               dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
+
        platform_set_drvdata(pdev, priv);
        dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);
 
-- 
1.8.3.1

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