linux-kernel - Re: [Letux-kernel] [PATCH RFC 4/5] gnss: sirf: add a separate supply for a lna

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Date:   Mon, 19 Nov 2018 09:41:58 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     Johan Hovold <johan@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [Letux-kernel] [PATCH RFC 4/5] gnss: sirf: add a separate supply for a lna

> Am 18.11.2018 um 22:58 schrieb Andreas Kemnade <andreas@...nade.info>:
> 
> Devices might have a separate lna between antenna output of the gps
> chip and the antenna which might have a separate supply
> 
> Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> ---
> drivers/gnss/sirf.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
> index 6a0e5c0a2d62..f7573ca2dacd 100644
> --- a/drivers/gnss/sirf.c
> +++ b/drivers/gnss/sirf.c
> @@ -30,6 +30,7 @@ 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;
> @@ -217,6 +218,7 @@ static int sirf_runtime_suspend(struct device *dev)
> 
> 	if (!data->on_off)
> 		return regulator_disable(data->vcc);
> +	regulator_disable(data->lna);
> 	ret = sirf_set_active(data, false);
> 
> 	if (ret)
> @@ -245,13 +247,20 @@ static int sirf_runtime_resume(struct device *dev)
> 		if (ret)
> 			goto err_close_serdev;
> 	}
> +
> +	ret = regulator_enable(data->lna);
> +	if (ret)
> +		goto err_disable_vcc;
> +
> 	ret = sirf_set_active(data, true);
> 
> 	if (!ret)
> 		return 0;
> 
> +err_disable_vcc:
> 	if (!data->on_off)
> 		regulator_disable(data->vcc);
> +
> err_close_serdev:
> 	serdev_device_close(data->serdev);
> 	return ret;
> @@ -340,6 +349,12 @@ 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
> 
> _______________________________________________
> http://projects.goldelico.com/p/gta04-kernel/
> Letux-kernel mailing list
> Letux-kernel@...nphoenux.org
> http://lists.goldelico.com/mailman/listinfo.cgi/letux-kernel

Looks good and to do what it is designed for.

Acked-by: H. Nikolaus Schaller <hns@...delico.com>

BR and thanks,
Nikolaus

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