From: andrew@lunn.ch (Andrew Lunn)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 10/10] net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs
Date: Fri, 8 Sep 2017 16:17:36 +0200 [thread overview]
Message-ID: <20170908141736.GF25219@lunn.ch> (raw)
In-Reply-To: <20170908140832.GB3037@Red>
> > Do you know why the reset times out/fails?
> >
>
> Because there are nothing connected to it.
That should not be an issue. A read should just return 0xffff. And it
should return 0xffff fast. The timing of the MDIO protocol is fixed. A
read or a write takes a fixed number of cycles, independent of if
there is a device there or not. The bus data line has a pullup, so if
you try to access a missing device, you automatically read 0xffff.
Andrew
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Corentin Labbe <clabbe.montjoie@gmail.com>
Cc: robh+dt@kernel.org, mark.rutland@arm.com,
maxime.ripard@free-electrons.com, wens@csie.org,
linux@armlinux.org.uk, catalin.marinas@arm.com,
will.deacon@arm.com, peppe.cavallaro@st.com,
alexandre.torgue@st.com, f.fainelli@gmail.com,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 10/10] net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs
Date: Fri, 8 Sep 2017 16:17:36 +0200 [thread overview]
Message-ID: <20170908141736.GF25219@lunn.ch> (raw)
In-Reply-To: <20170908140832.GB3037@Red>
> > Do you know why the reset times out/fails?
> >
>
> Because there are nothing connected to it.
That should not be an issue. A read should just return 0xffff. And it
should return 0xffff fast. The timing of the MDIO protocol is fixed. A
read or a write takes a fixed number of cycles, independent of if
there is a device there or not. The bus data line has a pullup, so if
you try to access a missing device, you automatically read 0xffff.
Andrew
next prev parent reply other threads:[~2017-09-08 14:17 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-08 7:11 [PATCH v5 00/10] net: stmmac: dwmac-sun8i: Handle integrated PHY Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 01/10] arm64: dts: allwinner: Restore EMAC changes Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:19 ` Maxime Ripard
2017-09-08 7:19 ` Maxime Ripard
2017-09-08 7:36 ` Corentin Labbe
2017-09-08 7:36 ` Corentin Labbe
2017-09-08 7:36 ` Corentin Labbe
2017-09-08 7:39 ` Chen-Yu Tsai
2017-09-08 7:39 ` Chen-Yu Tsai
2017-09-10 18:56 ` Corentin Labbe
2017-09-10 18:56 ` Corentin Labbe
2017-09-10 18:56 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 02/10] dt-bindings: net: Restore sun8i dwmac binding Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-13 18:07 ` Rob Herring
2017-09-13 18:07 ` Rob Herring
2017-09-14 18:31 ` Corentin Labbe
2017-09-14 18:31 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 03/10] arm: dts: sunxi: Restore EMAC changes Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 04/10] net: stmmac: sun8i: Restore the compatibles Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 05/10] dt-bindings: net: dwmac-sun8i: update documentation about integrated PHY Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:25 ` Maxime Ripard
2017-09-08 7:25 ` Maxime Ripard
2017-09-08 7:25 ` Maxime Ripard
2017-09-08 7:43 ` Corentin Labbe
2017-09-08 7:43 ` Corentin Labbe
2017-09-08 7:43 ` Corentin Labbe
2017-09-13 18:20 ` Rob Herring
2017-09-13 18:20 ` Rob Herring
2017-09-13 18:20 ` Rob Herring
2017-09-14 18:53 ` Corentin Labbe
2017-09-14 18:53 ` Corentin Labbe
2017-09-14 18:53 ` Corentin Labbe
2017-09-14 19:19 ` Andrew Lunn
2017-09-14 19:19 ` Andrew Lunn
2017-09-19 5:31 ` Corentin Labbe
2017-09-19 5:31 ` Corentin Labbe
2017-09-19 5:31 ` Corentin Labbe
2017-09-19 5:31 ` Corentin Labbe
2017-09-20 2:49 ` Rob Herring
2017-09-20 2:49 ` Rob Herring
2017-09-20 2:49 ` Rob Herring
2017-09-20 18:23 ` Corentin Labbe
2017-09-20 18:23 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 06/10] ARM: dts: sunxi: h3/h5: represent the mdio switch used by sun8i-h3-emac Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 07/10] arm64: dts: allwinner: add snps, dwmac-mdio compatible to emac/mdio Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 07/10] arm64: dts: allwinner: add snps,dwmac-mdio " Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 08/10] net: stmmac: dwmac-sun8i: choose internal PHY via phy-is-integrated Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 09/10] net: stmmac: snps, dwmac-mdio MDIOs are automatically registered Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 09/10] net: stmmac: snps,dwmac-mdio " Corentin Labbe
2017-09-08 7:11 ` [PATCH v5 10/10] net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs Corentin Labbe
2017-09-08 7:11 ` Corentin Labbe
2017-09-08 13:05 ` Andrew Lunn
2017-09-08 13:05 ` Andrew Lunn
2017-09-08 13:26 ` Corentin Labbe
2017-09-08 13:26 ` Corentin Labbe
2017-09-08 14:00 ` Andrew Lunn
2017-09-08 14:00 ` Andrew Lunn
2017-09-08 14:00 ` Andrew Lunn
2017-09-08 14:08 ` Corentin Labbe
2017-09-08 14:08 ` Corentin Labbe
2017-09-08 14:08 ` Corentin Labbe
2017-09-08 14:17 ` Andrew Lunn [this message]
2017-09-08 14:17 ` Andrew Lunn
2017-09-08 14:28 ` Corentin Labbe
2017-09-08 14:28 ` Corentin Labbe
2017-09-11 16:11 ` Andrew Lunn
2017-09-11 16:11 ` Andrew Lunn
2017-09-11 19:08 ` Corentin Labbe
2017-09-11 19:08 ` Corentin Labbe
2017-09-11 20:19 ` Andrew Lunn
2017-09-11 20:19 ` Andrew Lunn
2017-09-11 20:19 ` Andrew Lunn
2017-09-12 7:54 ` Corentin Labbe
2017-09-12 7:54 ` Corentin Labbe
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