netdev - Re: [PATCH V3] net: phy: tja11xx: Add TJA11xx PHY driver

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Message-ID: <974e1e74-f3a8-1960-d3eb-a60d0614f352@gmail.com>
Date:   Thu, 3 Jan 2019 07:23:27 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Marek Vasut <marex@...x.de>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH V3] net: phy: tja11xx: Add TJA11xx PHY driver

On 03.01.2019 03:09, Marek Vasut wrote:
> On 12/23/18 10:16 AM, Marek Vasut wrote:
>> On 12/22/18 6:39 PM, Heiner Kallweit wrote:
>>> On 22.12.2018 00:35, Marek Vasut wrote:
>>>> Add driver for the NXP TJA1100 and TJA1101 PHYs. These PHYs are special
>>>> BroadRReach 100BaseT1 PHYs used in automotive.
>>>>
>>>> Signed-off-by: Marek Vasut <marex@...x.de>
>>>> Cc: Andrew Lunn <andrew@...n.ch>
>>>> Cc: Florian Fainelli <f.fainelli@...il.com>
>>>> Cc: Heiner Kallweit <hkallweit1@...il.com>
>>>> ---
>>>> V2: - Use phy_modify(), phy_{set,clear}_bits()
>>>>     - Drop enable argument of tja11xx_enable_link_control()
>>>>     - Use PHY_BASIC_T1_FEATURES and dont modify supported/advertised
>>>>       features in config_init callback
>>>>     - Use genphy_soft_reset() instead of opencoding the reset sequence.
>>>>     - Drop the aneg parts, since the PHY datasheet claims it does not
>>>>       support aneg
>>>> V3: - Replace clr with mask
>>>>     - Add hwmon support
>>>>     - Check commstat in tja11xx_read_status() only if link is up
>>>>     - Use PHY_ID_MATCH_MODEL()
>>>> ---
>>>>  drivers/net/phy/Kconfig       |   6 +
>>>>  drivers/net/phy/Makefile      |   1 +
>>>>  drivers/net/phy/nxp-tja11xx.c | 424 ++++++++++++++++++++++++++++++++++
>>>>  3 files changed, 431 insertions(+)
>>>>  create mode 100644 drivers/net/phy/nxp-tja11xx.c
>>>>
>>> [...]
>>>> +
>>>> +struct tja11xx_phy_stats {
>>>> +	const char	*string;
>>>> +	u8		reg;
>>>> +	u8		off;
>>>> +	u16		mask;
>>>> +};
>>>> +
>>> As written in my other mail, you could think of using
>>> FIELD_GET() again. Things like
>>> ... n, BIT(n), 
>>> ... m, BIT(m), 
>>> are simply redundant.
>>
>> Done
> 
> And undone, FIELD_GET() requires a mask that is compile-time constant.
> That's not the case here.
> 
> Replicating what FIELD_GET() does at runtime is inefficient, so we can
> as well encode the field and offset back into the table. Or is there a
> better suggestion ?
> 
You're right, FIELD_GET() requires a constant as mask. Then for the
case here I'm not aware of a better solution than having also the mask
in the table.