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

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Date:	Fri, 12 Feb 2016 09:14:20 +0900
From:	"Kim, Milo" <milo.kim@...com>
To:	Paul Kocialkowski <contact@...lk.fr>
CC:	<linux-kernel@...r.kernel.org>, 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>,
	Javier Martinez Canillas <javier@...hile0.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] regulator: lp872x: Remove warning about invalid
 DVS GPIO

On 2/6/2016 3:42 AM, Paul Kocialkowski wrote:
> 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>

Acked-by: Milo Kim <milo.kim@...com>

> ---
>   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");
>