linux-kernel - [PATCH] extcon: arizona: Use bypass mode for MICVDD

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Date:	Fri,  7 Sep 2012 17:44:51 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] extcon: arizona: Use bypass mode for MICVDD

We can perform microphone detection with MICVDD in bypass mode so try to
enable that during startup for minimal power - other users or machine
constraints will prevent bypass mode being activated if it is unsuitable.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---

This depends on the newly added regulator bypass support which will be
going in during the merge window so probably the easiest thing here is
if I apply this to the regulator tree?  I will be publishing a signed
tag if you want to pull it in but for a simple, non-invasive change like
this it seems like more trouble than it's worth.

 drivers/extcon/extcon-arizona.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index dc81d5f..cdab9e5 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -483,6 +483,11 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
 	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 			   ARIZONA_JD1_ENA, ARIZONA_JD1_ENA);
 
+	ret = regulator_allow_bypass(info->micvdd, true);
+	if (ret != 0)
+		dev_warn(arizona->dev, "Failed to set MICVDD to bypass: %d\n",
+			 ret);
+
 	pm_runtime_put(&pdev->dev);
 
 	ret = input_register_device(info->input);
-- 
1.7.10.4

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