netdev - Re: [PATCH v1 net-next] lan743x: lan743x: Add PTP support

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Date:   Sat, 11 Aug 2018 12:28:02 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Bryan Whitehead <Bryan.Whitehead@...rochip.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v1 net-next] lan743x: lan743x: Add PTP support

On Thu, Aug 09, 2018 at 03:36:10PM -0400, Bryan Whitehead wrote:
> +static int lan743x_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
> +{
> +	struct lan743x_ptp *ptp =
> +		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
> +	struct lan743x_adapter *adapter =
> +		container_of(ptp, struct lan743x_adapter, ptp);
> +	u32 lan743x_rate_adj = 0;
> +	bool positive = true;
> +	u64 u64_delta = 0;
> +
> +	if ((scaled_ppm < (-LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM)) ||
> +	    scaled_ppm > LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM) {
> +		return -EINVAL;

Maybe ERANGE is better here.

> +	}
> +	if (scaled_ppm > 0) {
> +		u64_delta = (u64)scaled_ppm;
> +		positive = true;
> +	} else {
> +		u64_delta = (u64)(-scaled_ppm);
> +		positive = false;
> +	}
> +	u64_delta = (u64_delta << 19);
> +	lan743x_rate_adj = div_u64(u64_delta, 1000000);
> +
> +	if (positive)
> +		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
> +
> +	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
> +			  lan743x_rate_adj);
> +
> +	return 0;
> +}
> +
> +static int lan743x_ptpci_adjfreq(struct ptp_clock_info *ptpci, s32 delta_ppb)
> +{

Since you have adjfine, you can delete adjfreq.  The core PTP code
does this in ptp_clock.c:

		if (ops->adjfine)
			err = ops->adjfine(ops, tx->freq);
		else
			err = ops->adjfreq(ops, ppb);

Thanks,
Richard