linux-kernel - [PATCH-V5 3/4] mfd: 88pm800: Set default interrupt clear method

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Date:	Mon, 29 Jun 2015 21:01:16 +0530
From:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	devicetree@...r.kernel.org, robh+dt@...nel.org,
	sameo@...ux.intel.com, lee.jones@...aro.org,
	linux-kernel@...r.kernel.org, yizhang@...vell.com,
	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>,
	Zhao Ye <zhaoy@...vell.com>
Subject: [PATCH-V5 3/4] mfd: 88pm800: Set default interrupt clear method

As per the spec, bit 1 (INT_CLEAR_MODE) of reg addr 0xe
(page 0) controls the method of clearing interrupt
status of 88pm800 family of devices;

  0: clear on read
  1: clear on write

If pdata is not coming from board file, then set the
default irq clear method to "irq clear on write"

Also, as suggested by "Lee Jones" renaming variable field
to appropriate name.

Signed-off-by: Zhao Ye <zhaoy@...vell.com>
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
---
 drivers/mfd/88pm800.c       | 15 ++++++++++-----
 include/linux/mfd/88pm80x.h | 10 ++++++++--
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c
index d495737..66347be 100644
--- a/drivers/mfd/88pm800.c
+++ b/drivers/mfd/88pm800.c
@@ -374,7 +374,7 @@ static int device_irq_init_800(struct pm80x_chip *chip)
 {
 	struct regmap *map = chip->regmap;
 	unsigned long flags = IRQF_ONESHOT;
-	int data, mask, ret = -EINVAL;
+	int irq_clr_mode, mask, ret = -EINVAL;
 
 	if (!map || !chip->irq) {
 		dev_err(chip->dev, "incorrect parameters\n");
@@ -382,15 +382,16 @@ static int device_irq_init_800(struct pm80x_chip *chip)
 	}
 
 	/*
-	 * irq_mode defines the way of clearing interrupt. it's read-clear by
-	 * default.
+	 * irq_clr_on_wr defines the way of clearing interrupt by
+	 * read/write(0/1).  It's read-clear by default.
 	 */
 	mask =
 	    PM800_WAKEUP2_INV_INT | PM800_WAKEUP2_INT_CLEAR |
 	    PM800_WAKEUP2_INT_MASK;
 
-	data = PM800_WAKEUP2_INT_CLEAR;
-	ret = regmap_update_bits(map, PM800_WAKEUP2, mask, data);
+	irq_clr_mode = chip->irq_clr_method == PM800_IRQ_CLR_ON_WRITE ?
+		PM800_WAKEUP2_INT_WRITE_CLEAR : PM800_WAKEUP2_INT_READ_CLEAR;
+	ret = regmap_update_bits(map, PM800_WAKEUP2, mask, irq_clr_mode);
 
 	if (ret < 0)
 		goto out;
@@ -512,6 +513,7 @@ static int device_800_init(struct pm80x_chip *chip,
 	}
 
 	chip->regmap_irq_chip = &pm800_irq_chip;
+	chip->irq_clr_method = pdata->irq_clr_method;
 
 	ret = device_irq_init_800(chip);
 	if (ret < 0) {
@@ -564,6 +566,9 @@ static int pm800_probe(struct i2c_client *client,
 		pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 		if (!pdata)
 			return -ENOMEM;
+
+		/* by default, set irq clear method on write */
+		pdata->irq_clr_method = PM800_IRQ_CLR_ON_WRITE;
 	}
 
 	ret = pm80x_init(client);
diff --git a/include/linux/mfd/88pm80x.h b/include/linux/mfd/88pm80x.h
index 8fcad63..648e01a 100644
--- a/include/linux/mfd/88pm80x.h
+++ b/include/linux/mfd/88pm80x.h
@@ -77,6 +77,8 @@ enum {
 #define PM800_WAKEUP2			(0x0E)
 #define PM800_WAKEUP2_INV_INT		BIT(0)
 #define PM800_WAKEUP2_INT_CLEAR		BIT(1)
+#define PM800_WAKEUP2_INT_READ_CLEAR	(0 << 1)
+#define PM800_WAKEUP2_INT_WRITE_CLEAR	(1 << 1)
 #define PM800_WAKEUP2_INT_MASK		BIT(2)
 
 #define PM800_POWER_UP_LOG		(0x10)
@@ -300,7 +302,11 @@ struct pm80x_chip {
 	struct regmap_irq_chip_data *irq_data;
 	int type;
 	int irq;
-	int irq_mode;
+
+#define PM800_IRQ_CLR_ON_READ	0
+#define PM800_IRQ_CLR_ON_WRITE	1
+
+	bool irq_clr_method;	/* '1': Clear on write, '0': Clear on read */
 	unsigned long wu_flag;
 	spinlock_t lock;
 };
@@ -315,7 +321,7 @@ struct pm80x_platform_data {
 	 */
 	struct regulator_init_data *regulators[PM800_ID_RG_MAX];
 	unsigned int num_regulators;
-	int irq_mode;		/* Clear interrupt by read/write(0/1) */
+	bool irq_clr_method;		/* Clear interrupt by read/write(0/1) */
 	int batt_det;		/* enable/disable */
 	int (*plat_config)(struct pm80x_chip *chip,
 				struct pm80x_platform_data *pdata);
-- 
1.9.1

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