linux-kernel - Re: [PATCH v1 1/1] serial: 8250_bcm7271: Replace custom unit definitions

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Date: Thu, 15 Feb 2024 21:40:20 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Cooper <alcooperx@...il.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v1 1/1] serial: 8250_bcm7271: Replace custom unit
 definitions

On Thu, Feb 15, 2024 at 11:27:39AM -0800, Florian Fainelli wrote:
> On 2/15/24 11:21, Andy Shevchenko wrote:
> > On Thu, Feb 15, 2024 at 10:35:11AM -0800, Florian Fainelli wrote:
> > > On 2/15/24 08:02, Andy Shevchenko wrote:

..

> > > > -#define KHZ    1000
> > > > -#define MHZ(x) ((x) * KHZ * KHZ)
> > > >    static const u32 brcmstb_rate_table[] = {
> > > > -	MHZ(81),
> > > > -	MHZ(108),
> > > > -	MHZ(64),		/* Actually 64285715 for some chips */
> > > > -	MHZ(48),
> > > > +	81 * HZ_PER_MHZ,
> > > > +	108 * HZ_PER_MHZ,
> > > > +	64 * HZ_PER_MHZ,		/* Actually 64285715 for some chips */
> > > > +	48 * HZ_PER_MHZ,
> > > 
> > > The previous notation was IMHO more readable,
> > 
> > I tend to disagree as we read in plain text "frequency is 64 MHz",
> > the patch follows natural language.
> > 
> > > can we meet in the middle and do:
> > > 
> > > #define MHZ(x)	((x) * HZ_PER_MHZ
> > > 
> > > and avoid touching the tables entirely?
> > 
> > I don't like the intermediate layer which hides the implementation of MHZ().
> > What does it do exactly? You need to look at the internals, with the patch
> > applied you immediately see that these are just constants.
> 
> OK, I suppose today's color is blue for the bike shed.

Sky is blue and sun is shining and I am happy person :-)

> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>

Thank you!

-- 
With Best Regards,
Andy Shevchenko