linux-kernel - Re: [PATCH v3 03/36] mtd: st_spi_fsm: Initialise and configure the FSM for normal working conditions

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Date:	Tue, 10 Dec 2013 12:08:10 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, angus.clark@...com, linus.walleij@...aro.org,
	linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v3 03/36] mtd: st_spi_fsm: Initialise and configure the
 FSM for normal working conditions

On Tue, Dec 10, 2013 at 11:01:00AM -0800, Brian Norris wrote:
> On Fri, Nov 29, 2013 at 12:18:52PM +0000, Lee Jones wrote:
> > +	/*
> > +	 * Calculate clk_div - values between 2 and 128
> > +	 * Multiple of 2, rounded up
> > +	 */
> > +	clk_div = 2*((emi_freq + (2*spi_freq - 1))/(2*spi_freq));
> 
> I think this can use the <linux/kerne.h> round_up() macro. Also, you're
> missing some spacing. Possibly:
> 
> 	clk_div = 2 * round_up(emi_freq, 2 * spi_freq);

Sorry, I was reading one thing and writing another; this would be
DIV_ROUND_UP():

	clk_div = 2 * DIV_ROUND_UP(emi_freq, 2 * spi_freq);

> > +		fsm->fifo_dir_delay = (clk_div + 9) / 10;
> 
> round_down()?

Sorry, I again meant DIV_ROUND_UP:

		fsm->fifo_dir_delay = DIV_ROUND_UP(clk_div, 10);

Brian
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