linux-kernel - Re: [PATCH 06/14] net: dsa: Add support for hardware monitoring

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Message-ID: <5449E66B.6090902@roeck-us.net>
Date:	Thu, 23 Oct 2014 22:40:59 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Miller <davem@...emloft.net>
CC:	f.fainelli@...il.com, netdev@...r.kernel.org, andrew@...n.ch,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/14] net: dsa: Add support for hardware monitoring

On 10/23/2014 10:03 PM, David Miller wrote:
> From: Guenter Roeck <linux@...ck-us.net>
> Date: Wed, 22 Oct 2014 22:06:41 -0700
>
>> On 10/22/2014 09:37 PM, Florian Fainelli wrote:
>>> 2014-10-22 21:03 GMT-07:00 Guenter Roeck <linux@...ck-us.net>:
>>>> Some Marvell switches provide chip temperature data.
>>>> Add support for reporting it to the dsa infrastructure.
>>>>
>>>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>>>> ---
>>> [snip]
>>>
>>>> +/* hwmon support
>>>> ************************************************************/
>>>> +
>>>> +#if defined(CONFIG_HWMON) || (defined(MODULE) &&
>>>> defined(CONFIG_HWMON_MODULE))
>>>
>>> IS_ENABLED(CONFIG_HWMON)?
>>>
>>
>> Hi Florian,
>>
>> unfortunately, that won't work; I had it initially and got a nice
>> error message
>> from Fengguang's build test bot.
>
> Then the Kconfig dependencies are broken.
>
> Fix Kconfig to only allow legal combinations.
>

I see two options for that:

- Add
	select HWMON
   to the NET_DSA Kconfig entry.
   Example is Broadcom TIGON3 driver.

- Add a DSA_HWMON Kconfig entry to define the dependencies and
   to let the user select if the functionality should be enabled.
   Example is Intel IGB driver.

Any preference from your side ? If no, I'll go with the latter.

Thanks,
Guenter

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