linux-kernel - [PATCH 3/3] mfd: arizona: Use regmap_read_poll

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Date:   Wed, 4 Jan 2017 15:10:55 +0000
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     <lee.jones@...aro.org>
CC:     <patches@...nsource.wolfsonmicro.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/3] mfd: arizona: Use regmap_read_poll_timeout instead of hard coding it

arizona_poll_reg essentially hard-codes regmap_read_poll_timeout, this
patch updates the implementation to use regmap_read_poll_timeout. We
still keep arizona_poll_reg around as regmap_read_poll_timeout is a
macro so rather than expand this for each caller keep it wrapped in
arizona_poll_reg.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 4cb34c3..e6fae3c 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -236,28 +236,22 @@ static irqreturn_t arizona_overclocked(int irq, void *data)
 }
 
 static int arizona_poll_reg(struct arizona *arizona,
-			    int timeout, unsigned int reg,
+			    int npolls, unsigned int reg,
 			    unsigned int mask, unsigned int target)
 {
+	const int poll_us = 7500;
 	unsigned int val = 0;
-	int ret, i;
-
-	for (i = 0; i < timeout; i++) {
-		ret = regmap_read(arizona->regmap, reg, &val);
-		if (ret != 0) {
-			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
-				reg, ret);
-			continue;
-		}
-
-		if ((val & mask) == target)
-			return 0;
+	int ret;
 
-		usleep_range(1000, 5000);
-	}
+	ret = regmap_read_poll_timeout(arizona->regmap,
+				       ARIZONA_INTERRUPT_RAW_STATUS_5, val,
+				       ((val & mask) == target), poll_us,
+				       npolls * poll_us);
+	if (ret)
+		dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n",
+			reg, val);
 
-	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
-	return -ETIMEDOUT;
+	return ret;
 }
 
 static int arizona_wait_for_boot(struct arizona *arizona)
-- 
2.1.4