linux-kernel - Re: [PATCH V2 1/2] hwmon: (ibmpowernv) introduce a legacy

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Message-Id: <5cc575c8-246c-9559-e990-348b13e9ddd3@linux.vnet.ibm.com>
Date:   Tue, 20 Jun 2017 12:45:00 +0530
From:   Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To:     Cédric Le Goater <clg@...d.org>,
        linux@...ck-us.net, stewart@...ux.vnet.ibm.com
Cc:     jdelvare@...e.com, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, svaidy@...ux.vnet.ibm.com,
        ego@...ux.vnet.ibm.com, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH V2 1/2] hwmon: (ibmpowernv) introduce a legacy_compatibles
 array



On 06/20/2017 11:36 AM, Cédric Le Goater wrote:
> On 06/20/2017 07:08 AM, Shilpasri G Bhat wrote:
>> From: Cédric Le Goater <clg@...d.org>
>>
>> Today, the type of a PowerNV sensor system is determined with the
>> "compatible" property for legacy Firmwares and with the "sensor-type"
>> for newer ones. The same array of strings is used for both to do the
>> matching and this raises some issue to introduce new sensor types.
>>
>> Let's introduce two different arrays (legacy and current) to make
>> things easier for new sensor types.
>>
>> Signed-off-by: Cédric Le Goater <clg@...d.org>
>> Tested-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> 
> Did you test on a Tuleta (IBM Power) system ? 

I have tested this patch on P9 FSP and Firestone.

> 
> Thanks,
> 
> C. 
> 
>> ---
>>  drivers/hwmon/ibmpowernv.c | 26 ++++++++++++++++++--------
>>  1 file changed, 18 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
>> index 862b832..6d8909c 100644
>> --- a/drivers/hwmon/ibmpowernv.c
>> +++ b/drivers/hwmon/ibmpowernv.c
>> @@ -55,17 +55,27 @@ enum sensors {
>>  
>>  #define INVALID_INDEX (-1U)
>>  
>> +/*
>> + * 'compatible' string properties for sensor types as defined in old
>> + * PowerNV firmware (skiboot). These are ordered as 'enum sensors'.
>> + */
>> +static const char * const legacy_compatibles[] = {
>> +	"ibm,opal-sensor-cooling-fan",
>> +	"ibm,opal-sensor-amb-temp",
>> +	"ibm,opal-sensor-power-supply",
>> +	"ibm,opal-sensor-power"
>> +};
>> +
>>  static struct sensor_group {
>> -	const char *name;
>> -	const char *compatible;
>> +	const char *name; /* matches property 'sensor-type' */
>>  	struct attribute_group group;
>>  	u32 attr_count;
>>  	u32 hwmon_index;
>>  } sensor_groups[] = {
>> -	{"fan", "ibm,opal-sensor-cooling-fan"},
>> -	{"temp", "ibm,opal-sensor-amb-temp"},
>> -	{"in", "ibm,opal-sensor-power-supply"},
>> -	{"power", "ibm,opal-sensor-power"}
>> +	{ "fan"   },
>> +	{ "temp"  },
>> +	{ "in"    },
>> +	{ "power" }
>>  };
>>  
>>  struct sensor_data {
>> @@ -239,8 +249,8 @@ static int get_sensor_type(struct device_node *np)
>>  	enum sensors type;
>>  	const char *str;
>>  
>> -	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
>> -		if (of_device_is_compatible(np, sensor_groups[type].compatible))
>> +	for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) {
>> +		if (of_device_is_compatible(np, legacy_compatibles[type]))
>>  			return type;
>>  	}
>>  
>>
>