Subject: Re: [PATCH net-next 24/30] net: dsa: mt7530: rename MT7530_MFC to MT753X_MFC

From: "Russell King (Oracle)" <[email-masked]>
Date: Fri, 26 May 2023 16:50:40 +0100

On Fri, May 26, 2023 at 06:42:58PM +0300, Vladimir Oltean wrote:
> On Mon, May 22, 2023 at 03:15:26PM +0300, [email-masked] 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.

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