linux-kernel - Re: [PATCH v3 5/6] gnss: sirf: add a separate supply for a lna

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Date:   Tue, 22 Jan 2019 19:03:21 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     letux-kernel@...nphoenux.org, johan@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] gnss: sirf: add a separate supply for a lna

On Wed, Jan 16, 2019 at 10:18:11PM +0100, Andreas Kemnade wrote:
> Devices might have a separate lna between antenna input of the gps
> chip and the antenna which might have a separate supply.
> 
> Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> ---
> Changes in v3:
>  - improved error checking
>  - style cleanup
> 
> Changes in v2:
>  - handle lna also if there is no on-off gpio
>  - rebase on changed 2/5
> 
>  drivers/gnss/sirf.c | 50 ++++++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 44 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
> index 943a2ec9b708..7de98edf198a 100644
> --- a/drivers/gnss/sirf.c
> +++ b/drivers/gnss/sirf.c
> @@ -41,6 +41,7 @@ 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;
> @@ -293,21 +294,52 @@ 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;
>  
> -	if (!data->on_off)
> -		return regulator_disable(data->vcc);
> +	if (data->on_off)
> +		ret = sirf_set_active(data, false);
> +	else
> +		ret = regulator_disable(data->vcc);
> +
> +	if (ret)
> +		return ret;
>  
> -	return sirf_set_active(data, false);
> +	ret = regulator_disable(data->lna);
> +	if (ret) {

Use an error label for this to avoid the indentation.

> +		int reenable_ret;

Rename ret2 and move to start of function.

> +
> +		if (data->on_off)
> +			reenable_ret = sirf_set_active(data, true);
> +		else
> +			reenable_ret = regulator_enable(data->vcc);
> +
> +		if (reenable_ret)
> +			dev_err(dev,
> +				"failed to reenable power on failed suspend: %d\n",
> +				reenable_ret);
> +	}
> +
> +	return ret;
>  }
>  
>  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);
> +	if (data->on_off)
> +		ret = sirf_set_active(data, true);
> +	else
> +		ret = regulator_enable(data->vcc);
>  
> -	return sirf_set_active(data, true);
> +	if (ret)

Use an error label here too for consistency (and if if ever add further
resources to be manipulated here).

> +		regulator_disable(data->lna);
> +
> +	return ret;
>  }
>  
>  static int __maybe_unused sirf_suspend(struct device *dev)
> @@ -395,6 +427,12 @@ 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))

Johan