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Subject: Re: [Letux-kernel] [PATCH v2 4/5] gnss: sirf: add a separate supply for a lna
From:   "H. Nikolaus Schaller" <hns@goldelico.com>
In-Reply-To: <20181209195150.5192-5-andreas@kemnade.info>
Date:   Mon, 10 Dec 2018 08:42:48 +0100
Cc:     Johan Hovold <johan@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        devicetree <devicetree@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@openphoenux.org>
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Message-Id: <918A20A2-30F4-45C8-9883-038DE57716C3@goldelico.com>
References: <20181209195150.5192-1-andreas@kemnade.info> <20181209195150.5192-5-andreas@kemnade.info>
To:     Andreas Kemnade <andreas@kemnade.info>
Sender: linux-kernel-owner@vger.kernel.org
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Hi,

> Am 09.12.2018 um 20:51 schrieb Andreas Kemnade <andreas@kemnade.info>:
> 
> Devices might have a separate lna between antenna output of the gps

some nitpicking: the LNA (low noise amplifier) is between the antenna
and the GPS receiver. Therefore:

s/between antenna output of the gps/between antenna input of the gps/

Otherwise fine!

BR and thanks,
Nikolaus

> chip and the antenna which might have a separate supply.
> 
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> ---
> Changes in v2:
> - handle lna also if there is no on-off gpio
> - rebase on changed 2/5
> 
> drivers/gnss/sirf.c | 26 ++++++++++++++++++++++----
> 1 file changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
> index c64369494afb..d339e8ef2508 100644
> --- a/drivers/gnss/sirf.c
> +++ b/drivers/gnss/sirf.c
> @@ -36,6 +36,7 @@ struct sirf_data {
> 	struct serdev_device *serdev;
> 	speed_t	speed;
> 	struct regulator *vcc;
> +	struct regulator *lna;
> 	struct gpio_desc *on_off;
> 	struct gpio_desc *wakeup;
> 	int irq;
> @@ -282,21 +283,32 @@ static int sirf_set_active(struct sirf_data *data, bool active)
> static int sirf_runtime_suspend(struct device *dev)
> {
> 	struct sirf_data *data = dev_get_drvdata(dev);
> +	int ret = 0;
> 
> 	if (!data->on_off)
> -		return regulator_disable(data->vcc);
> +		ret = regulator_disable(data->vcc);
> +	else
> +		ret = sirf_set_active(data, false);
> 
> -	return sirf_set_active(data, false);
> +	if (ret)
> +		return ret;
> +
> +	return regulator_disable(data->lna);
> }
> 
> static int sirf_runtime_resume(struct device *dev)
> {
> 	struct sirf_data *data = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = regulator_enable(data->lna);
> +	if (ret)
> +		return ret;
> 
> 	if (!data->on_off)
> 		return regulator_enable(data->vcc);
> -
> -	return sirf_set_active(data, true);
> +	else
> +		return sirf_set_active(data, true);
> }
> 
> static int __maybe_unused sirf_suspend(struct device *dev)
> @@ -384,6 +396,12 @@ static int sirf_probe(struct serdev_device *serdev)
> 		goto err_put_device;
> 	}
> 
> +	data->lna = devm_regulator_get(dev, "lna");
> +	if (IS_ERR(data->lna)) {
> +		ret = PTR_ERR(data->lna);
> +		goto err_put_device;
> +	}
> +
> 	data->on_off = devm_gpiod_get_optional(dev, "sirf,onoff",
> 			GPIOD_OUT_LOW);
> 	if (IS_ERR(data->on_off))
> -- 
> 2.11.0
> 
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