From: Dylan Hung <dylan_hung@aspeedtech.com>
To: Philipp Zabel <p.zabel@pengutronix.de>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"joel@jms.id.au" <joel@jms.id.au>,
"andrew@aj.id.au" <andrew@aj.id.au>,
"andrew@lunn.ch" <andrew@lunn.ch>,
"hkallweit1@gmail.com" <hkallweit1@gmail.com>,
"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
"davem@davemloft.net" <davem@davemloft.net>,
"kuba@kernel.org" <kuba@kernel.org>,
"pabeni@redhat.com" <pabeni@redhat.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Cc: BMC-SW <BMC-SW@aspeedtech.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH 1/2] net: mdio: add reset deassertion for Aspeed MDIO
Date: Mon, 21 Mar 2022 08:20:01 +0000 [thread overview]
Message-ID: <HK0PR06MB28349EC113B35E5C2741BC3A9C169@HK0PR06MB2834.apcprd06.prod.outlook.com> (raw)
In-Reply-To: <84f2c72ced35506522ea3a6be72879d1699f885b.camel@pengutronix.de>
> -----Original Message-----
> From: Philipp Zabel [mailto:p.zabel@pengutronix.de]
> Sent: 2022年3月21日 4:15 PM
> To: Dylan Hung <dylan_hung@aspeedtech.com>; robh+dt@kernel.org;
> joel@jms.id.au; andrew@aj.id.au; andrew@lunn.ch; hkallweit1@gmail.com;
> linux@armlinux.org.uk; davem@davemloft.net; kuba@kernel.org;
> pabeni@redhat.com; devicetree@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; linux-aspeed@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; netdev@vger.kernel.org
> Cc: BMC-SW <BMC-SW@aspeedtech.com>; stable@vger.kernel.org
> Subject: Re: [PATCH 1/2] net: mdio: add reset deassertion for Aspeed MDIO
>
> Hi Dylan,
>
> On Mo, 2022-03-21 at 15:01 +0800, Dylan Hung wrote:
> > Add reset deassertion for Aspeed MDIO. There are 4 MDIO controllers
> > embedded in Aspeed AST2600 SOC and share one reset control register
> > SCU50[3]. So devm_reset_control_get_shared is used in this change.
> >
> > Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
> > Cc: stable@vger.kernel.org
> > ---
> > drivers/net/mdio/mdio-aspeed.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-
> > aspeed.c index e2273588c75b..8ac262a12d13 100644
> > --- a/drivers/net/mdio/mdio-aspeed.c
> > +++ b/drivers/net/mdio/mdio-aspeed.c
> > @@ -3,6 +3,7 @@
> >
> > #include <linux/bitfield.h>
> > #include <linux/delay.h>
> > +#include <linux/reset.h>
> > #include <linux/iopoll.h>
> > #include <linux/mdio.h>
> > #include <linux/module.h>
> > @@ -37,6 +38,7 @@
> >
> > struct aspeed_mdio {
> > void __iomem *base;
> > + struct reset_control *reset;
> > };
> >
> > static int aspeed_mdio_read(struct mii_bus *bus, int addr, int
> > regnum)
> > @@ -120,6 +122,12 @@ static int aspeed_mdio_probe(struct
> > platform_device *pdev)
> > if (IS_ERR(ctx->base))
> > return PTR_ERR(ctx->base);
> >
> > + ctx->reset = devm_reset_control_get_shared(&pdev->dev, NULL);
>
> The device tree bindings should have a required reset control property
> documented before this is added.
>
OK, I will add a commit for the document in V2.
> > + if (IS_ERR(ctx->reset))
> > + return PTR_ERR(ctx->reset);
> > +
> > + reset_control_deassert(ctx->reset);
> > +
>
> This is missing a corresponding reset_control_assert() in
> aspeed_mdio_remove() and in the error path of of_mdiobus_register().
> That would allow to assert the reset line again after all MDIO controllers are
> unbound.
Thank you for your comment. I will fix it in V2.
>
> regards
> Philipp
--
Dylan
next prev parent reply other threads:[~2022-03-21 8:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220321070131.23363-1-dylan_hung@aspeedtech.com>
2022-03-21 7:01 ` [PATCH 1/2] net: mdio: add reset deassertion for Aspeed MDIO Dylan Hung
2022-03-21 8:14 ` Philipp Zabel
2022-03-21 8:20 ` Dylan Hung [this message]
2022-03-21 7:01 ` [PATCH 2/2] ARM: dts: aspeed: add reset properties into MDIO nodes Dylan Hung
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