Subject: Re: [PATCH v2 12/13] net: ethernet: ti: cpts: calc mult and shift from refclk freq

From: Richard Cochran <[email-masked]>
Date: Tue, 29 Nov 2016 11:34:53 +0100

On Mon, Nov 28, 2016 at 05:03:36PM -0600, Grygorii Strashko wrote:
> +static void cpts_calc_mult_shift(struct cpts *cpts)
> +{
> +	u64 frac, maxsec, ns;
> +	u32 freq, mult, shift;
> +
> +	freq = clk_get_rate(cpts->refclk);
> +
> +	/* Calc the maximum number of seconds which we can run before
> +	 * wrapping around.
> +	 */
> +	maxsec = cpts->cc.mask;
> +	do_div(maxsec, freq);
> +	if (maxsec > 600 && cpts->cc.mask > UINT_MAX)
> +		maxsec = 600;

The reason for this test is not obvious.  Why check cc.mask against
UINT_MAX?  Please use the comment to explain it.

Thanks,
Richard
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