linux-kernel - Re: [PATCH v1 1/2] clk: intel: Add CGU clock driver for a new SoC

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Message-ID: <20190902122454.GF2680@smile.fi.intel.com>
Date:   Mon, 2 Sep 2019 15:24:54 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     "Tanwar, Rahul" <rahul.tanwar@...ux.intel.com>
Cc:     mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        robhkernel.org@...le.fi.intel.com, mark.rutland@....com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        qi-ming.wu@...el.com, yixin.zhu@...ux.intel.com,
        cheol.yong.kim@...el.com, rahul.tanwar@...el.com
Subject: Re: [PATCH v1 1/2] clk: intel: Add CGU clock driver for a new SoC

On Mon, Sep 02, 2019 at 03:20:30PM +0300, Andy Shevchenko wrote:
> On Mon, Sep 02, 2019 at 03:43:13PM +0800, Tanwar, Rahul wrote:
> > On 28/8/2019 11:09 PM, Andy Shevchenko wrote:
> > > On Wed, Aug 28, 2019 at 03:00:17PM +0800, Rahul Tanwar wrote:

> > > Does val == 0 follows the table, i.e. makes div == 1?
> > 
> > 0 val means output clock is ref clock i.e. div ==1. Agree that adding
> > .val = 0, .div =1 entry will make it more clear & complete.
> > 
> > > > +	{ .val = 0, .div = 1 },
> > > > +	{ .val = 1, .div = 2 },
> > > > +	{ .val = 2, .div = 3 },
> 
> 1
> 
> > > > +	{ .val = 3, .div = 4 },
> > > > +	{ .val = 4, .div = 5 },
> > > > +	{ .val = 5, .div = 6 },
> 
> 1
> 
> > > > +	{ .val = 6, .div = 8 },
> > > > +	{ .val = 7, .div = 10 },
> > > > +	{ .val = 8, .div = 12 },
> 
> 2
> 
> > > > +	{ .val = 9, .div = 16 },
> > > > +	{ .val = 10, .div = 20 },
> > > > +	{ .val = 11, .div = 24 },
> 
> 4
> 
> > > > +	{ .val = 12, .div = 32 },
> > > > +	{ .val = 13, .div = 40 },
> > > > +	{ .val = 14, .div = 48 },
> 
> 8
> 
> > > > +	{ .val = 15, .div = 64 },
> 
> 16
> 
> 
> So, now we see the pattern:
> 
> 	div = val < 3 ? (val + 1) : (1 << ((val - 3) / 3));

It's not complete, but I think you got the idea.

> So, can we eliminate table?

-- 
With Best Regards,
Andy Shevchenko