netdev - Re: [PATCH V2] net: phy: tja11xx: Add TJA11xx PHY driver

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Date:   Sat, 15 Dec 2018 18:38:08 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org, f.fainelli@...il.com
Subject: Re: [PATCH V2] net: phy: tja11xx: Add TJA11xx PHY driver

On 15.12.2018 18:01, Andrew Lunn wrote:
>> +static struct tja11xx_phy_stats tja11xx_hw_stats[] = {
>> +	{ "phy_symbol_error_count", 20, 0, 0xffff },
>> +	{ "phy_overtemp_error", 21, 1, BIT(1) },
>> +	{ "phy_undervolt_error", 21, 3, BIT(3) },
>> +	{ "phy_polarity_detect", 25, 6, BIT(6) },
>> +	{ "phy_open_detect", 25, 7, BIT(7) },
>> +	{ "phy_short_detect", 25, 8, BIT(8) },
> 
> Hi Marek
> 
> You have a number of one bit counters here, which is pretty unusual.
> The names also don't really suggest they are counters.
> 
Apart from few counters the values seem to be flags. I just think
it could be done in a little bit more readable form, e.g. instead of
{ "phy_short_detect", 25, 8, BIT(8) } use
{ "phy_short_detect", 25, BIT(8) } and in tja11xx_get_stats() then
use FIELD_GET (see linux/bitfield.h).

The idea of HWMON attributes sounds good to me because it allows
to use the flags to trigger actions in a structured way. And I
assume in case of e.g. "PHY undervolt" some monitoring system
would like to be informed (especially because we talk about
automotive here).

> Florian, Heiner, do we want to allow this?
> 
> 	 Andrew
>