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

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Date:   Fri, 29 May 2020 23:47:13 +0000
From:   Vijay Khemka <vijaykhemka@...com>
To:     Guenter Roeck <linux@...ck-us.net>,
        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, 11:56 AM, "Guenter Roeck" <groeck7@...il.com on behalf of linux@...ck-us.net> wrote:

    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 ?
Sorry for misinterpretation, No I don't mean that. This should be fine.

    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
    >     
    >     
    >