linux-kernel - Re: [PATCH v2] hwmon:(adm1275) Enable adm1278 ADM1278_TEMP1

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Date:   Fri, 29 May 2020 11:55:45 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Vijay Khemka <vijaykhemka@...com>,
        Manikandan Elumalai <manikandan.hcl.ers.epl@...il.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Cc:     "saipsdasari@...com" <saipsdasari@...com>,
        Patrick Williams <patrickw3@...com>,
        "manikandan.e@....com" <manikandan.e@....com>
Subject: Re: [PATCH v2] hwmon:(adm1275) Enable adm1278 ADM1278_TEMP1_EN

On 5/29/20 10:57 AM, Vijay Khemka wrote:
> 
> 
> On 5/29/20, 5:47 AM, "Manikandan Elumalai" <manikandan.hcl.ers.epl@...il.com> wrote:
> 
>     The adm1278 temperature sysfs attribute need it for one of the openbmc platform . 
>     This functionality is not enabled by default, so PMON_CONFIG needs to be modified in order to enable it.
>     
>     Signed-off-by   : Manikandan Elumalai <manikandan.hcl.ers.epl@...il.com>
>     
>     v2:
>        - Add Signed-off-by.
>        - Removed ADM1278_TEMP1_EN check.
>     ---
>      drivers/hwmon/pmbus/adm1275.c | 21 +++++++++++++++++----
>      1 file changed, 17 insertions(+), 4 deletions(-)
>     
>     diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
>     index 5caa37fb..ab5fceb 100644
>     --- a/drivers/hwmon/pmbus/adm1275.c
>     +++ b/drivers/hwmon/pmbus/adm1275.c
>     @@ -666,7 +666,23 @@ static int adm1275_probe(struct i2c_client *client,
>      		tindex = 3;
>      
>      		info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
>     -			PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
>     +			PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
>     +			PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
>     +
>     +		config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
>     +		if (config < 0)
>     +			return config;
>     +
>     +		/* Enable TEMP1 by default */
>     +		config |= ADM1278_TEMP1_EN;
>     +		ret = i2c_smbus_write_byte_data(client,
>     +					ADM1275_PMON_CONFIG,
>     +					config);
>     +		if (ret < 0) {
>     +		dev_err(&client->dev,
>     +			"Failed to enable temperature config\n");
>     +		return -ENODEV;
>     +		}
> You don't need this above code removing check as below should be enough  to
> populate sysfs entry you need.
> 

You mean you are only interested in having the attribute, even if it doesn't
report anything useful because monitoring is disabled in the chip ?
Sorry, I don't understand. Can you elaborate ?

Thanks,
Guenter

>      		/* Enable VOUT if not enabled (it is disabled by default) */
>      		if (!(config & ADM1278_VOUT_EN)) {
>     @@ -681,9 +697,6 @@ static int adm1275_probe(struct i2c_client *client,
>      			}
>      		}
>      
>     -		if (config & ADM1278_TEMP1_EN)
>     -			info->func[0] |=
>     -				PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
>      		if (config & ADM1278_VIN_EN)
>      			info->func[0] |= PMBUS_HAVE_VIN;
>      		break;
>     -- 
>     2.7.4
>     
>     
>