From: Lars Povlsen <lars.povlsen@microchip.com>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Andrew Lunn <andrew@lunn.ch>,
Steen Hegelund <steen.hegelund@microchip.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Russell King <linux@armlinux.org.uk>,
"Lars Povlsen" <lars.povlsen@microchip.com>,
Bjarni Jonasson <bjarni.jonasson@microchip.com>,
Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
Madalin Bucur <madalin.bucur@oss.nxp.com>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Mark Einon <mark.einon@gmail.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH v2 2/8] net: sparx5: add the basic sparx5 driver
Date: Wed, 23 Dec 2020 10:03:11 +0100 [thread overview]
Message-ID: <874kkcq4hc.fsf@microchip.com> (raw)
In-Reply-To: <20201222165600.GE3819852@piout.net>
Alexandre Belloni writes:
> On 22/12/2020 16:01:22+0100, Andrew Lunn wrote:
>> > The problem is that the switch core reset also affects (reset) the
>> > SGPIO controller.
>> >
>> > We tried to put this in the reset driver, but it was rejected. If the
>> > reset is done at probe time, the SGPIO driver may already have
>> > initialized state.
>> >
>> > The switch core reset will then reset all SGPIO registers.
>>
>> Ah, O.K. Dumb question. Why is the SGPIO driver a separate driver? It
>> sounds like it should be embedded inside this driver if it is sharing
>> hardware.
>>
>> Another option would be to look at the reset subsystem, and have this
>> driver export a reset controller, which the SGPIO driver can bind to.
>> Given that the GPIO driver has been merged, if this will work, it is
>> probably a better solution.
>>
>
> That was my suggestion. Then you can ensure from the reset controller
> driver that this is done exactly once, either from the sgpio driver or
> from the switchdev driver. IIRC, the sgpio from the other SoCs are not
> affected by the reset.
I will take a look to see if we can change the implementation to use a
reset controller.
---Lars
--
Lars Povlsen,
Microchip
next prev parent reply other threads:[~2020-12-23 9:05 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-17 7:51 [RFC PATCH v2 0/8] Adding the Sparx5 Switch Driver Steen Hegelund
2020-12-17 7:51 ` [RFC PATCH v2 1/8] dt-bindings: net: sparx5: Add sparx5-switch bindings Steen Hegelund
2020-12-19 17:54 ` Andrew Lunn
2020-12-21 0:55 ` Florian Fainelli
2020-12-21 10:00 ` Steen Hegelund
2020-12-21 21:40 ` Rob Herring
2020-12-22 7:30 ` Steen Hegelund
2020-12-17 7:51 ` [RFC PATCH v2 2/8] net: sparx5: add the basic sparx5 driver Steen Hegelund
2020-12-19 19:11 ` Andrew Lunn
2020-12-22 13:50 ` Steen Hegelund
2020-12-22 15:01 ` Andrew Lunn
2020-12-22 16:56 ` Alexandre Belloni
2020-12-23 9:03 ` Lars Povlsen [this message]
2020-12-23 8:52 ` Steen Hegelund
2020-12-17 7:51 ` [RFC PATCH v2 3/8] net: sparx5: add hostmode with phylink support Steen Hegelund
2020-12-19 19:51 ` Andrew Lunn
2020-12-22 9:46 ` Steen Hegelund
2020-12-22 14:41 ` Andrew Lunn
2020-12-23 13:29 ` Steen Hegelund
2020-12-23 20:58 ` Alexandre Belloni
2020-12-23 21:05 ` Andrew Lunn
2020-12-17 7:51 ` [RFC PATCH v2 4/8] net: sparx5: add port module support Steen Hegelund
2020-12-20 23:35 ` Andrew Lunn
2020-12-22 14:55 ` Bjarni Jonasson
2020-12-22 15:08 ` Andrew Lunn
2020-12-17 7:51 ` [RFC PATCH v2 5/8] net: sparx5: add switching, vlan and mactable support Steen Hegelund
2020-12-21 0:25 ` Andrew Lunn
2020-12-23 13:54 ` Steen Hegelund
2020-12-17 7:51 ` [RFC PATCH v2 6/8] net: sparx5: add calendar bandwidth allocation support Steen Hegelund
2020-12-17 7:51 ` [RFC PATCH v2 7/8] net: sparx5: add ethtool configuration and statistics support Steen Hegelund
2020-12-19 23:31 ` Andrew Lunn
2020-12-17 7:51 ` [RFC PATCH v2 8/8] arm64: dts: sparx5: Add the Sparx5 switch node Steen Hegelund
2020-12-19 20:24 ` Andrew Lunn
2020-12-23 14:31 ` Steen Hegelund
2020-12-23 15:49 ` Andrew Lunn
2020-12-21 0:58 ` [RFC PATCH v2 0/8] Adding the Sparx5 Switch Driver Florian Fainelli
2020-12-21 14:31 ` Steen Hegelund
2020-12-22 11:29 ` Lars Povlsen
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