linux-kernel - [PATCH v6] extcon: arizona: Simplify pdata symantics for micd

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Date:	Tue, 30 Jun 2015 13:32:39 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	cw00.choi@...sung.com
Cc:	myungjoo.ham@...sung.com, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6] extcon: arizona: Simplify pdata symantics for micd_dbtime

Currently micd_dbtime can be set to 0 for default, 1 for 4 measurements,
or a greater than 16-bit value for 2 measurements. This patch simplifies
the symantics to 2 for 2 measurements, 4 for 4 measurements and any
other value for the default.

I am not super keen on changing the symantics of the pdata at this stage
in the drivers life, but acceptance of the DT binding for this field has
been made conditional on this happening.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---

Changes from v5:
 - Move defines into extcon driver, rather than pdata header, it is
   unlikely that they would have seen any use there anyway and they
   can be moved there in a later change if needed.

Thanks,
Charles

 drivers/extcon/extcon-arizona.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index eaf0644..4b9f09c 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -48,6 +48,9 @@
 #define HPDET_DEBOUNCE 500
 #define DEFAULT_MICD_TIMEOUT 2000
 
+#define MICD_DBTIME_TWO_READINGS 2
+#define MICD_DBTIME_FOUR_READINGS 4
+
 #define MICD_LVL_1_TO_7 (ARIZONA_MICD_LVL_1 | ARIZONA_MICD_LVL_2 | \
 			 ARIZONA_MICD_LVL_3 | ARIZONA_MICD_LVL_4 | \
 			 ARIZONA_MICD_LVL_5 | ARIZONA_MICD_LVL_6 | \
@@ -1318,11 +1321,19 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 				   arizona->pdata.micd_rate
 				   << ARIZONA_MICD_RATE_SHIFT);
 
-	if (arizona->pdata.micd_dbtime)
+	switch (arizona->pdata.micd_dbtime) {
+	case MICD_DBTIME_FOUR_READINGS:
 		regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
 				   ARIZONA_MICD_DBTIME_MASK,
-				   arizona->pdata.micd_dbtime
-				   << ARIZONA_MICD_DBTIME_SHIFT);
+				   ARIZONA_MICD_DBTIME);
+		break;
+	case MICD_DBTIME_TWO_READINGS:
+		regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				   ARIZONA_MICD_DBTIME_MASK, 0);
+		break;
+	default:
+		break;
+	}
 
 	BUILD_BUG_ON(ARRAY_SIZE(arizona_micd_levels) != 0x40);
 
-- 
1.7.2.5

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