netdev - Re: [PATCH 1/9] netdev: bfin_mac: add support for IEEE 1588 PTP

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Message-ID: <20100511070716.GA3254@riccoc20.at.omicron.at>
Date:	Tue, 11 May 2010 09:07:16 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Barry Song <barry.song@...log.com>
Subject: Re: [PATCH 1/9] netdev: bfin_mac: add support for IEEE 1588 PTP

On Mon, May 10, 2010 at 11:39:06AM -0400, Mike Frysinger wrote:
> diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
> index 587f93c..6a9519f 100644
> --- a/drivers/net/bfin_mac.c
> +++ b/drivers/net/bfin_mac.c
...
> +#define PTP_CLK 25000000
> +
> +static void bfin_mac_hwtstamp_init(struct net_device *netdev)
> +{
> +	struct bfin_mac_local *lp = netdev_priv(netdev);
> +	u64 append;
> +
> +	/* Initialize hardware timer */
> +	append = PTP_CLK * (1ULL << 32);
> +	do_div(append, get_sclk());
> +	bfin_write_EMAC_PTP_ADDEND((u32)append);

It appears that one can tune this PTP clock.

I recently posted a suggestion for a PTP clock class driver. Would you
care to take a look at that and say whether that API would also work
for the blackfin?

Thanks,
Richard

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