From: Philipp Zabel <p.zabel@pengutronix.de>
To: Steen Hegelund <steen.hegelund@microchip.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>,
Russell King <linux@armlinux.org.uk>,
Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Madalin Bucur <madalin.bucur@oss.nxp.com>,
Mark Einon <mark.einon@gmail.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Simon Horman <simon.horman@netronome.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Bjarni Jonasson <bjarni.jonasson@microchip.com>,
Lars Povlsen <lars.povlsen@microchip.com>
Subject: Re: [PATCH net-next v3 02/10] net: sparx5: add the basic sparx5 driver
Date: Mon, 07 Jun 2021 10:13:50 +0200 [thread overview]
Message-ID: <b2d2a1b09704d09105be75aec04e27b9cc8db116.camel@pengutronix.de> (raw)
In-Reply-To: <b215ecea90794688906fb0a6d34636e1e8c1fc3e.camel@microchip.com>
On Mon, 2021-06-07 at 09:34 +0200, Steen Hegelund wrote:
> Hi Philipp,
>
> Thanks for your comments.
>
> On Fri, 2021-06-04 at 11:28 +0200, Philipp Zabel wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > Hi Steen,
> >
> > On Fri, 2021-06-04 at 10:55 +0200, Steen Hegelund wrote:
> > > This adds the Sparx5 basic SwitchDev driver framework with IO range
> > > mapping, switch device detection and core clock configuration.
> > >
> > > Support for ports, phylink, netdev, mactable etc. are in the following
> > > patches.
> > >
> > > Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
> > > Signed-off-by: Bjarni Jonasson <bjarni.jonasson@microchip.com>
> > > Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> > > ---
> > > drivers/net/ethernet/microchip/Kconfig | 2 +
> > > drivers/net/ethernet/microchip/Makefile | 2 +
> > > drivers/net/ethernet/microchip/sparx5/Kconfig | 9 +
> > > .../net/ethernet/microchip/sparx5/Makefile | 8 +
> > > .../ethernet/microchip/sparx5/sparx5_main.c | 746 +++
> > > .../ethernet/microchip/sparx5/sparx5_main.h | 273 +
> > > .../microchip/sparx5/sparx5_main_regs.h | 4642 +++++++++++++++++
> > > 7 files changed, 5682 insertions(+)
> > > create mode 100644 drivers/net/ethernet/microchip/sparx5/Kconfig
> > > create mode 100644 drivers/net/ethernet/microchip/sparx5/Makefile
> > > create mode 100644 drivers/net/ethernet/microchip/sparx5/sparx5_main.c
> > > create mode 100644 drivers/net/ethernet/microchip/sparx5/sparx5_main.h
> > > create mode 100644 drivers/net/ethernet/microchip/sparx5/sparx5_main_regs.h
> > >
> > [...]
> > > diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
> > > b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
> > > new file mode 100644
> > > index 000000000000..73beb85bc52d
> > > --- /dev/null
> > > +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
> > > @@ -0,0 +1,746 @@
> > [...]
> > > +static int mchp_sparx5_probe(struct platform_device *pdev)
> > > +{
> > [...]
> > > +
> > > + sparx5->reset = devm_reset_control_get_shared(&pdev->dev, "switch");
> > > + if (IS_ERR(sparx5->reset)) {
> >
> > Could you use devm_reset_control_get_optional_shared() instead of
> > ignoring this error? That would just return NULL if there's no "switch"
> > reset specified in the device tree.
>
> Yes. That sounds like a good idea. I assume that the devm_reset_control_get_optional_shared()
> would also return null if another driver has already performed the reset?
It returns the same (shared) reset control. But the following
reset_control_reset() [1] is a no-op if the control has already
triggered once.
If multiple drivers need to coordinate to trigger the reset more than
once (for example once after suspend/resume), both have to use
reset_control_rearm() [2].
[1] https://www.kernel.org/doc/html/latest/driver-api/reset.html#c.reset_control_reset
[2] https://www.kernel.org/doc/html/latest/driver-api/reset.html#c.reset_control_rearm
regards
Philipp
next prev parent reply other threads:[~2021-06-07 8:14 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 8:55 [PATCH net-next v3 00/10] Adding the Sparx5 Switch Driver Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 01/10] dt-bindings: net: sparx5: Add sparx5-switch bindings Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 02/10] net: sparx5: add the basic sparx5 driver Steen Hegelund
2021-06-04 9:28 ` Philipp Zabel
2021-06-07 7:34 ` Steen Hegelund
2021-06-07 8:13 ` Philipp Zabel [this message]
2021-06-04 8:55 ` [PATCH net-next v3 03/10] net: sparx5: add hostmode with phylink support Steen Hegelund
2021-06-07 9:15 ` Russell King (Oracle)
2021-06-07 12:45 ` Steen Hegelund
2021-06-07 13:09 ` Russell King (Oracle)
2021-06-07 15:12 ` Steen Hegelund
2021-06-07 15:35 ` Russell King (Oracle)
2021-06-08 9:24 ` Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 04/10] net: sparx5: add port module support Steen Hegelund
2021-06-07 9:21 ` Russell King (Oracle)
2021-06-07 12:46 ` Steen Hegelund
2021-06-07 13:12 ` Russell King (Oracle)
2021-06-07 15:14 ` Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 05/10] net: sparx5: add mactable support Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 06/10] net: sparx5: add vlan support Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 07/10] net: sparx5: add switching support Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 08/10] net: sparx5: add calendar bandwidth allocation support Steen Hegelund
2021-06-04 8:55 ` [PATCH net-next v3 09/10] net: sparx5: add ethtool configuration and statistics support Steen Hegelund
2021-06-04 8:56 ` [PATCH net-next v3 10/10] arm64: dts: sparx5: Add the Sparx5 switch node Steen Hegelund
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