linux-kernel - Re: [PATCH 1/2] hwmon: ina3221: Add power sysfs nodes

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Date:   Wed, 26 Sep 2018 12:49:05 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     jdelvare@...e.com, corbet@....net, afd@...com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/2] hwmon: ina3221: Add power sysfs nodes

Hello Guenter,

On Wed, Sep 26, 2018 at 12:45:34PM -0700, Guenter Roeck wrote:
> Hi Nicolin,
> 
> On Wed, Sep 26, 2018 at 11:20:06AM -0700, Nicolin Chen wrote:
> > On Wed, Sep 26, 2018 at 05:34:53AM -0700, Guenter Roeck wrote:
> > > Hi Nicolin,
> > > 
> > > On 09/25/2018 11:42 PM, Nicolin Chen wrote:
> > > > The hwmon sysfs ABI supports powerX_input and powerX_crit. This
> > > > can ease user space programs who care more about power in total
> > > > than voltage or current individually.
> > > > 
> > > > So this patch adds these two sysfs nodes for INA3221 driver.
> > 
> > > Ah, sorry, we can't do that. The sysfs nodes are for chips providing power
> > > registers, not for kernel drivers to provide calculations based on voltage
> > > and current measurements.
> > 
> > Hmm..I saw ina2xx.c and ltc4215.c are doing similar calculations...
> > 
> 
> ina2xx.c doesn't; the chips supported by the driver do have a register
> reporting the power (0x03). ltc4215.c was not reviewed by a hwmon
> maintainer. I think I mentioned before that you can find anything you want
> in the Linux kernel. That doesn't make it right.

OK. In that case, I am dropping this change.

Thanks
Nicolin