linux-kernel - Re: [PATCH v2] net: ethernet: sun4i-emac: replace magic number with macro

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Message-ID: <20220110092836.113dbae1@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Mon, 10 Jan 2022 09:28:36 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     Conley Lee <conleylee@...mail.com>, davem@...emloft.net,
        mripard@...nel.org, wens@...e.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: sun4i-emac: replace magic number with
 macro

On Mon, 10 Jan 2022 14:56:35 +0100 Corentin Labbe wrote:
> > @@ -61,7 +62,21 @@
> >  #define EMAC_RX_IO_DATA_STATUS_OK	(1 << 7)
> >  #define EMAC_RX_FBC_REG		(0x50)
> >  #define EMAC_INT_CTL_REG	(0x54)
> > +#define EMAC_INT_CTL_RX_EN	(1 << 8)
> > +#define EMAC_INT_CTL_TX0_EN	(1)
> > +#define EMAC_INT_CTL_TX1_EN	(1 << 1)
> > +#define EMAC_INT_CTL_TX_EN	(EMAC_INT_CTL_TX0_EN | EMAC_INT_CTL_TX1_EN)
> > +#define EMAC_INT_CTL_TX0_ABRT_EN	(0x1 << 2)
> > +#define EMAC_INT_CTL_TX1_ABRT_EN	(0x1 << 3)
> > +#define EMAC_INT_CTL_TX_ABRT_EN	(EMAC_INT_CTL_TX0_ABRT_EN | EMAC_INT_CTL_TX1_ABRT_EN)
> >  #define EMAC_INT_STA_REG	(0x58)
> > +#define EMAC_INT_STA_TX0_COMPLETE	(0x1)
> > +#define EMAC_INT_STA_TX1_COMPLETE	(0x1 << 1)
> > +#define EMAC_INT_STA_TX_COMPLETE	(EMAC_INT_STA_TX0_COMPLETE | EMAC_INT_STA_TX1_COMPLETE)
> > +#define EMAC_INT_STA_TX0_ABRT	(0x1 << 2)
> > +#define EMAC_INT_STA_TX1_ABRT	(0x1 << 3)
> > +#define EMAC_INT_STA_TX_ABRT	(EMAC_INT_STA_TX0_ABRT | EMAC_INT_STA_TX1_ABRT)
> > +#define EMAC_INT_STA_RX_COMPLETE	(0x1 << 8)  
> 
> As proposed by checkpatch, I thing there are several place (like all
> EMAC_INT_STA) where you could use BIT(x) instead of (0xX << x)

That's not a hard requirement, if the driver already uses the shift you
can leave your code as is, some upstream developers actually prefer to
avoid the BIT() macro.