linux-kernel - [PATCH v2 1/4] regulator: lp872x: Remove warning about invalid DVS GPIO

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Message-Id: <1454697741-8687-2-git-send-email-contact@paulk.fr>
Date:	Fri,  5 Feb 2016 19:42:18 +0100
From:	Paul Kocialkowski <contact@...lk.fr>
To:	linux-kernel@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, Milo Kim <milo.kim@...com>,
	Javier Martinez Canillas <javier@...hile0.org>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, Paul Kocialkowski <contact@...lk.fr>
Subject: [PATCH v2 1/4] regulator: lp872x: Remove warning about invalid DVS GPIO

Some devices don't hook the DVS pin to a GPIO but to ground or VCC.
In those cases, it is not a problem to have no DVS GPIO provided, as the current
code will already switch to software-only DVS selection:

When the DVS GPIO is invalid, lp872x_init_dvs jumps to the set_default_dvs_mode
label, which instructs the chip not to use the DVS pin at all and do it all in
software instead (by clearing the LP8720_EXT_DVS_M bit in the
LP872X_GENERAL_CFG register).

That is reflected later in the code, when setting the bucks (the DVS pin only
applies to the bucks) by checking for the LP8720_EXT_DVS_M bit on the
LP872X_GENERAL_CFG register (in lp872x_select_buck_vout_addr) to decide whether
to use software or hardware DVS selection.

Thus, there is no need to print a warning when the DVS GPIO is invalid.

Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
---
 drivers/regulator/lp872x.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index 19d7584..21c49d8 100644
--- a/drivers/regulator/lp872x.c
+++ b/drivers/regulator/lp872x.c
@@ -738,10 +738,8 @@ static int lp872x_init_dvs(struct lp872x *lp)
 		goto set_default_dvs_mode;

 	gpio = dvs->gpio;
-	if (!gpio_is_valid(gpio)) {
-		dev_warn(lp->dev, "invalid gpio: %d\n", gpio);
+	if (!gpio_is_valid(gpio))
 		goto set_default_dvs_mode;
-	}

 	pinstate = dvs->init_state;
 	ret = devm_gpio_request_one(lp->dev, gpio, pinstate, "LP872X DVS");
-- 
1.9.1