linux-kernel - Re: [PATCH 2/2] net: dsa: register hwmon for any provided function

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Date:	Thu, 16 Apr 2015 18:05:39 -0400 (EDT)
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH 2/2] net: dsa: register hwmon for any provided function

Hi Guenter,

> >          switch (index) {
> > +        case 0: /* temp1_input */
> > +                if (drv->get_temp)
> > +                        mode |= S_IRUGO;
> 
> This should be mandatory. Sorry, I don't really understand what you are
> trying to accomplish here.
> 
> Can you give me a real world example where a chip would support setting
> a limit but not reading it ?

I have no such example. I just did not see why this couldn't be allowed
(e.g. setting only set_temp_limit and get_temp_alarm looks fine to me).
But if you say that get_temp should be mandatory, I'm OK with that.

The primary goal of this patchset was to use DEVICE_ATTR_RW to declare
temp1_max, instead of reflecting the minimal permissions needed.

Best,
-v
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