linux-kernel - Re: [PATCH v3 2/4] hwmon: (lm90) Use hwmon_notify

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Message-ID: <20da6f55-682f-4b30-7be7-f425f8efa995@nvidia.com>
Date:   Mon, 21 Feb 2022 16:16:28 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Dmitry Osipenko <digetx@...il.com>,
        Jean Delvare <jdelvare@...e.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 2/4] hwmon: (lm90) Use hwmon_notify_event()


On 21/02/2022 16:02, Guenter Roeck wrote:

...

>> The platform I see this on does use device-tree and it does have a 
>> node for the ti,tmp451 device which uses the lm90 device. This 
>> platform uses the device-tree source 
>> arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts and the tmp451 node 
>> is in arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi.
>>
> 
> Interesting. It appears that the call to 
> devm_thermal_zone_of_sensor_register()
> in the hwmon core nevertheless returns -ENODEV which is not handled 
> properly
> in the hwmon core. I can see a number of reasons for this to happen:
> - there is no devicetree node for the lm90 device
> - there is no thermal-zones devicetree node
> - there is no thermal zone entry in the thermal-zones node which matches
>    the sensor


So we definitely have the node for the lm90 device and a thermal-zones 
node, but I do not see a thermal-sensor node. Maybe this is what we are 
missing?

Jon

-- 
nvpublic