linux-kernel - RE: [PATCH v2 3/3] ARM: dts: aspeed: add reset properties into MDIO nodes

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Date:   Tue, 22 Mar 2022 08:44:43 +0000
From:   Dylan Hung <dylan_hung@...eedtech.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     BMC-SW <BMC-SW@...eedtech.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] ARM: dts: aspeed: add reset properties into MDIO
 nodes

> -----Original Message-----
> From: Krzysztof Kozlowski [mailto:krzk@...nel.org]
> Sent: 2022年3月22日 4:40 PM
> To: Dylan Hung <dylan_hung@...eedtech.com>; robh+dt@...nel.org;
> joel@....id.au; andrew@...id.au; andrew@...n.ch; hkallweit1@...il.com;
> linux@...linux.org.uk; davem@...emloft.net; kuba@...nel.org;
> pabeni@...hat.com; p.zabel@...gutronix.de; devicetree@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-aspeed@...ts.ozlabs.org;
> linux-kernel@...r.kernel.org; netdev@...r.kernel.org
> Cc: BMC-SW <BMC-SW@...eedtech.com>; stable@...r.kernel.org
> Subject: Re: [PATCH v2 3/3] ARM: dts: aspeed: add reset properties into MDIO
> nodes
> 
> On 22/03/2022 03:32, Dylan Hung wrote:
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski [mailto:krzk@...nel.org]
> >> Sent: 2022年3月21日 11:53 PM
> >> To: Dylan Hung <dylan_hung@...eedtech.com>; robh+dt@...nel.org;
> >> joel@....id.au; andrew@...id.au; andrew@...n.ch;
> >> hkallweit1@...il.com; linux@...linux.org.uk; davem@...emloft.net;
> >> kuba@...nel.org; pabeni@...hat.com; p.zabel@...gutronix.de;
> >> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> >> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org;
> >> netdev@...r.kernel.org
> >> Cc: BMC-SW <BMC-SW@...eedtech.com>; stable@...r.kernel.org
> >> Subject: Re: [PATCH v2 3/3] ARM: dts: aspeed: add reset properties
> >> into MDIO nodes
> >>
> >> On 21/03/2022 10:56, Dylan Hung wrote:
> >>> Add reset control properties into MDIO nodes.  The 4 MDIO
> >>> controllers in
> >>> AST2600 SOC share one reset control bit SCU50[3].
> >>>
> >>> Signed-off-by: Dylan Hung <dylan_hung@...eedtech.com>
> >>> Cc: stable@...r.kernel.org
> >>
> >> Please describe the bug being fixed. See stable-kernel-rules.
> >
> > Thank you for your comment.
> > The reset deassertion of the MDIO device was usually done by the
> bootloader (u-boot).
> > However, one of our clients uses proprietary bootloader and doesn't
> > deassert the MDIO reset so failed to access the HW in kernel driver.
> > The reset deassertion is missing in the kernel driver since it was created,
> should I add a BugFix for the first commit of this driver?
> > Or would it be better if I remove " Cc: stable@...r.kernel.org"?
> 
> This rather looks like a missing feature, not a bug. Anyway any description
> must be in commit message.

Thank you. I will remove " Cc: stable@...r.kernel.org" and add more description
in commit message in V3.

> 
> 
> Best regards,
> Krzysztof