linux-kernel - Re: [PATCH net-next 24/30] net: dsa: mt7530: rename MT7530_MFC to MT753X

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Message-ID: <e4aff9aa-d0c6-1f2e-7f16-35df59d51b90@arinc9.com>
Date:   Sun, 4 Jun 2023 11:06:32 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 24/30] net: dsa: mt7530: rename MT7530_MFC to
 MT753X_MFC



On 26.05.2023 18:50, Russell King (Oracle) wrote:
> On Fri, May 26, 2023 at 06:42:58PM +0300, Vladimir Oltean wrote:
>> On Mon, May 22, 2023 at 03:15:26PM +0300, arinc9.unal@...il.com wrote:
>>>   	/* Disable flooding on all ports */
>>> -	mt7530_clear(priv, MT7530_MFC, BC_FFP_MASK | UNM_FFP_MASK |
>>> -		     UNU_FFP_MASK);
>>> +	mt7530_clear(priv, MT753X_MFC, MT753X_BC_FFP_MASK | MT753X_UNM_FFP_MASK
>>> +		     | MT753X_UNU_FFP_MASK);
>>
>> The preferred coding style is not to start new lines with operators.
>>
>>> +/* Register for CPU forward control */
>>>   #define MT7531_CFC			0x4
>>>   #define  MT7531_MIRROR_EN		BIT(19)
>>> -#define  MT7531_MIRROR_MASK		(MIRROR_MASK << 16)
>>> -#define  MT7531_MIRROR_PORT_GET(x)	(((x) >> 16) & MIRROR_MASK)
>>> -#define  MT7531_MIRROR_PORT_SET(x)	(((x) & MIRROR_MASK) << 16)
>>> +#define  MT7531_MIRROR_MASK		(0x7 << 16)
>>
>> minor nitpick: if you express this as GENMASK(18, 16), it will be a bit
>> easier to cross-check with the datasheet, since both 18 and 16 are more
>> representative than 0x7.
>>
>>> +#define  MT7531_MIRROR_PORT_GET(x)	(((x) >> 16) & 0x7)
>>
>> also here: (((x) & GENMASK(18, 16)) >> 16)
> 
> Even better are:
> #define  MT7531_MIRROR_PORT_GET(x)	FIELD_GET(MT7531_MIRROR_MASK, x)
> 
>>
>>> +#define  MT7531_MIRROR_PORT_SET(x)	(((x) & 0x7) << 16)
>>
>> and here: (((x) << 16) & GENMASK(18, 16))
> 
> #define  MT7531_MIRROR_PORT_SET(x)	FIELD_PREP(MT7531_MIRROR_MASK, x)
> 
> No need to add parens around "x" in either of these uses as we're not
> doing anything with x other than passing it into another macro.

Thanks. I suppose the GENMASK, FIELD_PREP, and FIELD_GET macros can be 
widely used on mt7530.h? Like GENMASK(2, 0) on MT7530_MIRROR_MASK and 
FIELD_PREP(MT7530_MIRROR_MASK, x) on MT7530_MIRROR_PORT(x)?

Arınç