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From: Andrew Lunn <andrew@lunn.ch>
To: Daniel Walker <danielwa@cisco.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Jose Abreu <joabreu@synopsys.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Balamurugan Selvarajan <balamsel@cisco.com>,
	xe-linux-external@cisco.com,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC-PATCH] net: stmmac: Add KR port support.
Date: Sat, 31 Jul 2021 04:29:03 +0200	[thread overview]
Message-ID: <YQS1bzsIAD83+762@lunn.ch> (raw)
In-Reply-To: <20210730144830.GO1633923@zorba>

On Fri, Jul 30, 2021 at 07:48:30AM -0700, Daniel Walker wrote:
> On Fri, Jul 30, 2021 at 05:01:44AM +0200, Andrew Lunn wrote:
> > On Thu, Jul 29, 2021 at 04:44:42PM -0700, Daniel Walker wrote:
> > > From: Balamurugan Selvarajan <balamsel@cisco.com>
> > > 
> > > For KR port the mii interface is a chip-to-chip
> > > interface without a mechanical connector. So PHY
> > > inits are not applicable. In this case MAC is
> > > configured to operate at forced speed(1000Mbps)
> > > and full duplex. Modified driver to accommodate
> > > PHY and NON-PHY mode.
> > 
> > I agree with Florian here. Look at all the in kernel examples of a SoC
> > MAC connected to an Ethernet switch. Some use rgmii, others 1000BaseX
> > or higher. But they all follow the same scheme, and don't need
> > invasive MAC driver changes.
> 
> 
> Can you provide the examples which you looked at ?

There are plenty of examples using Freescale FEC and Marvell Ethernet
switches:

arch/arm/boot/dts/vf610-zii-dev-rev-b.dts

Or the Mavell based

arch/arm/boot/dts/armada-xp-linksys-mamba.dts

	Andrew

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Daniel Walker <danielwa@cisco.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Jose Abreu <joabreu@synopsys.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Balamurugan Selvarajan <balamsel@cisco.com>,
	xe-linux-external@cisco.com,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC-PATCH] net: stmmac: Add KR port support.
Date: Sat, 31 Jul 2021 04:29:03 +0200	[thread overview]
Message-ID: <YQS1bzsIAD83+762@lunn.ch> (raw)
In-Reply-To: <20210730144830.GO1633923@zorba>

On Fri, Jul 30, 2021 at 07:48:30AM -0700, Daniel Walker wrote:
> On Fri, Jul 30, 2021 at 05:01:44AM +0200, Andrew Lunn wrote:
> > On Thu, Jul 29, 2021 at 04:44:42PM -0700, Daniel Walker wrote:
> > > From: Balamurugan Selvarajan <balamsel@cisco.com>
> > > 
> > > For KR port the mii interface is a chip-to-chip
> > > interface without a mechanical connector. So PHY
> > > inits are not applicable. In this case MAC is
> > > configured to operate at forced speed(1000Mbps)
> > > and full duplex. Modified driver to accommodate
> > > PHY and NON-PHY mode.
> > 
> > I agree with Florian here. Look at all the in kernel examples of a SoC
> > MAC connected to an Ethernet switch. Some use rgmii, others 1000BaseX
> > or higher. But they all follow the same scheme, and don't need
> > invasive MAC driver changes.
> 
> 
> Can you provide the examples which you looked at ?

There are plenty of examples using Freescale FEC and Marvell Ethernet
switches:

arch/arm/boot/dts/vf610-zii-dev-rev-b.dts

Or the Mavell based

arch/arm/boot/dts/armada-xp-linksys-mamba.dts

	Andrew

  reply	other threads:[~2021-07-31  2:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 23:44 [RFC-PATCH] net: stmmac: Add KR port support Daniel Walker
2021-07-29 23:44 ` Daniel Walker
2021-07-30  0:10 ` Florian Fainelli
2021-07-30  0:10   ` Florian Fainelli
2021-07-30  3:01 ` Andrew Lunn
2021-07-30  3:01   ` Andrew Lunn
2021-07-30 14:48   ` Daniel Walker
2021-07-30 14:48     ` Daniel Walker
2021-07-31  2:29     ` Andrew Lunn [this message]
2021-07-31  2:29       ` Andrew Lunn
2021-07-30 15:11 ` Russell King (Oracle)
2021-07-30 15:11   ` Russell King (Oracle)

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