netdev - RE: [PATCH v2 net-next 04/14] ptp: netc: add PTP_CLK_REQ

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Message-ID:
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Date: Thu, 17 Jul 2025 11:59:30 +0000
From: Wei Fang <wei.fang@....com>
To: Frank Li <frank.li@....com>
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Subject: RE: [PATCH v2 net-next 04/14] ptp: netc: add PTP_CLK_REQ_PPS support

> > +static u32 netc_timer_calculate_fiper_pw(struct netc_timer *priv,
> > +					 u32 fiper)
> > +{
> > +	u64 divisor, pulse_width;
> > +
> > +	/* Set the FIPER pulse width to half FIPER interval by default.
> > +	 * pulse_width = (fiper / 2) / TMR_GCLK_period,
> > +	 * TMR_GCLK_period = NSEC_PER_SEC / TMR_GCLK_freq,
> > +	 * TMR_GCLK_freq = (clk_freq / oclk_prsc) Hz,
> > +	 * so pulse_width = fiper * clk_freq / (2 * NSEC_PER_SEC * oclk_prsc).
> > +	 */
> > +	divisor = mul_u32_u32(2000000000U, priv->oclk_prsc);
> 
> is it 2*PSEC_PER_SEC ?
> 

No, it is 2 * NSEC_PER_SEC, NSEC_PER_SEC is 1000000000.