linux-kernel - Re: [PATCHv9 02/20] thermal: introduce device tree parser

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Date:	Thu, 2 Jan 2014 11:03:15 +0800
From:	Wei Ni <wni@...dia.com>
To:	Wei Ni <wei.nee.1977@...il.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"rui.zhang@...el.com" <rui.zhang@...el.com>
CC:	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"durgadoss.r@...el.com" <durgadoss.r@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv9 02/20] thermal: introduce device tree parser

Sorry, please ignore this mail.
This is not my regularly mail address.

Thanks.
Wei.

On 01/02/2014 10:55 AM, Wei Ni wrote:
> On 11/13/2013 03:46 AM, Eduardo Valentin wrote:
>> ....
>> +
>> +/**
>> + * of_parse_thermal_zones - parse device tree thermal data
>> + *
>> + * Initialization function that can be called by machine initialization
>> + * code to parse thermal data and populate the thermal framework
>> + * with hardware thermal zones info. This function only parses thermal zones.
>> + * Cooling devices and sensor devices nodes are supposed to be parsed
>> + * by their respective drivers.
>> + *
>> + * Return: 0 on success, proper error code otherwise
>> + *
>> + */
>> +int __init of_parse_thermal_zones(void)
>> +{
>> +	struct device_node *np, *child;
>> +	struct __thermal_zone *tz;
>> +	struct thermal_zone_device_ops *ops;
>> +
>> +	np = of_find_node_by_name(NULL, "thermal-zones");
>> +	if (!np) {
>> +		pr_debug("unable to find thermal zones\n");
>> +		return 0; /* Run successfully on systems without thermal DT */
>> +	}
>> +
>> +	for_each_child_of_node(np, child) {
>> +		struct thermal_zone_device *zone;
>> +		struct thermal_zone_params *tzp;
>> +
>> +		tz = thermal_of_build_thermal_zone(child);
>> +		if (IS_ERR(tz)) {
>> +			pr_err("failed to build thermal zone %s: %ld\n",
>> +			       child->name,
>> +			       PTR_ERR(tz));
>> +			continue;
>> +		}
>> +
>> +		ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
>> +		if (!ops)
>> +			goto exit_free;
>> +
>> +		tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
>> +		if (!tzp) {
>> +			kfree(ops);
>> +			goto exit_free;
>> +		}
>> +
>> +		/* No hwmon because there might be hwmon drivers registering */
>> +		tzp->no_hwmon = true;
> 
> I think the platform driver may set the governor for the thermal zone,
> so how about to add a property named as "governor",
> and parse it to tzp->governor_name ?
> something like:
>                 ret = of_property_read_string(child, "governor", &str);
>                 if (ret == 0)
>                         if (strlen(str) < THERMAL_NAME_LENGTH)
>                                 strcpy(tzp->governor_name, str);
> 
> Thanks.
> Wei.
> 
>> +
>> +		zone = thermal_zone_device_register(child->name, tz->ntrips,
>> +						    0, tz,
>> +						    ops, tzp,
>> +						    tz->passive_delay,
>> +						    tz->polling_delay);
>> +		if (IS_ERR(zone)) {
>> +			pr_err("Failed to build %s zone %ld\n", child->name,
>> +			       PTR_ERR(zone));
>> +			kfree(tzp);
>> +			kfree(ops);
>> +			of_thermal_free_zone(tz);
>> +			/* attempting to build remaining zones still */
>> +		}
>> +	}
>> +
>> +	return 0;
>> +
>> +exit_free:
>> +	of_thermal_free_zone(tz);
>> +
>> +	/* no memory available, so free what we have built */
>> +	of_thermal_destroy_zones();
>> +
>> +	return -ENOMEM;
>> +}
>> +
>>
> 

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