From: LABBE Corentin <clabbe.montjoie@gmail.com>
To: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: robh+dt@kernel.org, mark.rutland@arm.com, wens@csie.org,
linux@armlinux.org.uk, davem@davemloft.net,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com
Subject: Re: [PATCH v2 1/5] ethernet: add sun8i-emac driver
Date: Wed, 24 Aug 2016 14:02:21 +0200 [thread overview]
Message-ID: <20160824120221.GB29212@Red> (raw)
In-Reply-To: <20160725195455.GQ7419@lukather>
> > +/* Set Management Data Clock, must be call after device reset */
> > +static void sun8i_emac_set_mdc(struct net_device *ndev)
> > +{
> > + struct sun8i_emac_priv *priv = netdev_priv(ndev);
> > + unsigned long rate;
> > + u32 reg;
> > +
> > + rate = clk_get_rate(priv->ahb_clk);
> > + if (rate > 160000000)
> > + reg = 0x3 << 20; /* AHB / 128 */
> > + else if (rate > 80000000)
> > + reg = 0x2 << 20; /* AHB / 64 */
> > + else if (rate > 40000000)
> > + reg = 0x1 << 20; /* AHB / 32 */
> > + else
> > + reg = 0x0 << 20; /* AHB / 16 */
> > + netif_dbg(priv, link, ndev, "MDC auto : %x\n", reg);
> > + writel(reg, priv->base + SUN8I_EMAC_MDIO_CMD);
>
> You could also expose that as a clock.
>
For which purpose ?
No ethernet driver expose the MDC as clock and I dont see any interest:
- I dont think that tuning it give any gain
- Knowing it's value is of little interest
Regards
next prev parent reply other threads:[~2016-08-24 14:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 8:03 [PATCH v2 0/5] net-next: ethernet: add sun8i-emac driver LABBE Corentin
2016-07-20 8:03 ` [PATCH v2 1/5] " LABBE Corentin
2016-07-20 9:56 ` Arnd Bergmann
2016-07-28 13:18 ` LABBE Corentin
2016-07-29 9:26 ` Arnd Bergmann
2016-07-25 19:54 ` Maxime Ripard
2016-07-28 14:57 ` LABBE Corentin
2016-07-29 17:25 ` Maxime Ripard
2016-07-30 1:30 ` Chen-Yu Tsai
2016-07-30 7:34 ` Maxime Ripard
2016-07-29 10:12 ` Andre Przywara
2016-08-24 12:02 ` LABBE Corentin [this message]
2016-08-26 20:49 ` Maxime Ripard
2016-07-20 8:03 ` [PATCH v2 2/5] MAINTAINERS: Add myself as maintainers of sun8i-emac LABBE Corentin
2016-07-20 8:03 ` [PATCH v2 3/5] ARM: sun8i: dt: Add DT bindings documentation for Allwinner sun8i-emac LABBE Corentin
2016-07-20 19:15 ` Rob Herring
2016-07-28 13:21 ` LABBE Corentin
2016-07-21 7:55 ` Maxime Ripard
2016-07-28 13:40 ` LABBE Corentin
2016-07-28 18:49 ` Maxime Ripard
2016-07-29 8:15 ` LABBE Corentin
2016-07-29 18:12 ` Maxime Ripard
2016-07-20 8:03 ` [PATCH v2 4/5] ARM: dts: sun8i-h3: add sun8i-emac ethernet driver LABBE Corentin
2016-07-20 8:03 ` [PATCH v2 5/5] ARM: dts: sun8i: Enable sun8i-emac on the Orange PI PC LABBE Corentin
2016-07-25 13:16 ` [PATCH v2 0/5] net-next: ethernet: add sun8i-emac driver paulo
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