linux-kernel - Re: [PATCH v6 3/4] thermal: tegra: parse sensor id before sensor register

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Message-ID: <20181219012450.GA2842@localhost.localdomain>
Date:   Tue, 18 Dec 2018 17:24:52 -0800
From:   Eduardo Valentin <edubezval@...il.com>
To:     Wei Ni <wni@...dia.com>
Cc:     rui.zhang@...el.com, thierry.reding@...il.com,
        daniel.lezcano@...aro.org, linux-tegra@...r.kernel.org,
        srikars@...dia.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/4] thermal: tegra: parse sensor id before sensor
 register

On Fri, Dec 14, 2018 at 05:49:52PM +0800, Wei Ni wrote:
> Since different platforms may not support all 4
> sensors, so the sensor registration may be failed.
> Add codes to parse dt to find sensor id which
> need to be registered. So that the registration
> can be successful on all platform.
> 
> Signed-off-by: Wei Ni <wni@...dia.com>
> ---
>  drivers/thermal/tegra/soctherm.c | 45 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 43 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
> index fd2703c0cfc5..6bee31cd4621 100644
> --- a/drivers/thermal/tegra/soctherm.c
> +++ b/drivers/thermal/tegra/soctherm.c
> @@ -1224,6 +1224,41 @@ static void soctherm_init(struct platform_device *pdev)
>  	tegra_soctherm_throttle(&pdev->dev);
>  }
>  
> +static bool tegra_soctherm_find_sensor_id(unsigned int sensor_id)
> +{
> +	bool ret = false;
> +	struct of_phandle_args sensor_specs;
> +	struct device_node *np, *sensor_np;
> +
> +	np = of_find_node_by_name(NULL, "thermal-zones");
> +	if (!np)
> +		return ret;
> +
> +	for_each_available_child_of_node(np, sensor_np) {
> +		if (of_parse_phandle_with_args(sensor_np, "thermal-sensors",
> +						 "#thermal-sensor-cells",
> +						 0, &sensor_specs))
> +			continue;
> +
> +		if (sensor_specs.args_count != 1) {
> +			WARN(sensor_specs.args_count != 1,
> +			     "%s: wrong cells in sensor specifier %d\n",
> +			     sensor_specs.np->name, sensor_specs.args_count);
> +			continue;
> +		}
> +
> +		if (sensor_specs.args[0] == sensor_id) {
> +			of_node_put(sensor_np);
> +			ret = true;
> +			break;
> +		}
> +	}
> +
> +	of_node_put(np);
> +
> +	return ret;
> +}

So, I am still failing to see why this is really needed. 

Why can't you simply resolve this with different compatibles?
If the sensor is not present or disabled, the compatible is not, well,
compatible anymore.

> +
>  static const struct of_device_id tegra_soctherm_of_match[] = {
>  #ifdef CONFIG_ARCH_TEGRA_124_SOC
>  	{
> @@ -1365,13 +1400,16 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>  		zone->sg = soc->ttgs[i];
>  		zone->ts = tegra;
>  
> +		if (!tegra_soctherm_find_sensor_id(soc->ttgs[i]->id))
> +			continue;
> +
>  		z = devm_thermal_zone_of_sensor_register(&pdev->dev,
>  							 soc->ttgs[i]->id, zone,
>  							 &tegra_of_thermal_ops);
>  		if (IS_ERR(z)) {
>  			err = PTR_ERR(z);
> -			dev_err(&pdev->dev, "failed to register sensor: %d\n",
> -				err);
> +			dev_err(&pdev->dev, "failed to register sensor %s: %d\n",
> +				soc->ttgs[i]->name, err);
>  			goto disable_clocks;
>  		}
>  
> @@ -1434,6 +1472,9 @@ static int __maybe_unused soctherm_resume(struct device *dev)
>  		struct thermal_zone_device *tz;
>  
>  		tz = tegra->thermctl_tzs[soc->ttgs[i]->id];
> +		if (!tz)
> +			continue;
> +
>  		err = tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
>  		if (err) {
>  			dev_err(&pdev->dev,
> -- 
> 2.7.4
>