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

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Message-ID: <2796d0aa-daae-aaa0-ca51-59a156d667c6@denx.de>
Date:   Fri, 4 Jan 2019 03:19:55 +0100
From:   Marek Vasut <marex@...x.de>
To:     Heiner Kallweit <hkallweit1@...il.com>, 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 1/3/19 7:23 AM, Heiner Kallweit wrote:
> 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.

V4 is out then.

-- 
Best regards,
Marek Vasut