linux-kernel - Re: [PATCH net-next v3 02/10] net: sparx5: add the basic sparx5 driver

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Date:   Mon, 7 Jun 2021 09:34:20 +0200
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Andrew Lunn <andrew@...n.ch>, Russell King <linux@...linux.org.uk>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Mark Einon <mark.einon@...il.com>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Simon Horman <simon.horman@...ronome.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: Re: [PATCH net-next v3 02/10] net: sparx5: add the basic sparx5
 driver

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@...rochip.com>
> > Signed-off-by: Bjarni Jonasson <bjarni.jonasson@...rochip.com>
> > Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.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?

> 
> > +             dev_warn(sparx5->dev, "Could not obtain reset control: %ld\n",
> > +                      PTR_ERR(sparx5->reset));
> > +             sparx5->reset = NULL;
> > +     } else {
> > +             reset_control_reset(sparx5->reset);
> > +     }
> 
> If this is the only place the reset is used, I'd remove it from struct
> sparx5 and use a local variable instead.

Yes.  I will do that.

> 
> regards
> Philipp


Best 

-- 
BR
Steen

-=-=-=-=-=-=-=-=-=-=-=-=-=-=
steen.hegelund@...rochip.com