From: Andrew Lunn <andrew@lunn.ch>
To: Yangfl <mmyangfl@gmail.com>
Cc: netdev@vger.kernel.org, Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Simon Horman <horms@kernel.org>,
Russell King <linux@armlinux.org.uk>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [net-next v5 1/3] dt-bindings: net: dsa: yt921x: Add Motorcomm YT921x switch support
Date: Thu, 21 Aug 2025 15:42:16 +0200 [thread overview]
Message-ID: <f76df98e-f743-4dc2-9f10-93b97f69addb@lunn.ch> (raw)
In-Reply-To: <CAAXyoMMpf9u7aZO204moF5DHd+QR4aAxxdtEdTx-iU77DKhBDg@mail.gmail.com>
On Thu, Aug 21, 2025 at 08:50:18PM +0800, Yangfl wrote:
> On Thu, Aug 21, 2025 at 8:41 PM Andrew Lunn <andrew@lunn.ch> wrote:
> >
> > > + switch@1d {
> > > + compatible = "motorcomm,yt9215";
> > > + /* default 0x1d, alternate 0x0 */
> > > + reg = <0x1d>;
> >
> > Just curious, what does alternative 0x0 mean? Does this switch have
> > only one strapping pin for address, so it either uses address 0x1d or
> > 0x0?
> >
> > Andrew
>
> Yes. I've seen this approach on other chips (offering two MDIO
> phyaddrs), so this should be a common practice.
If it only supports two addresses, you could add a constrain in the
binding that reg is [0x0, 0x1d].
Andrew
next prev parent reply other threads:[~2025-08-21 13:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 7:54 [net-next v5 0/3] net: dsa: yt921x: Add support for Motorcomm YT921x David Yang
2025-08-20 7:54 ` [net-next v5 1/3] dt-bindings: net: dsa: yt921x: Add Motorcomm YT921x switch support David Yang
2025-08-21 7:22 ` Krzysztof Kozlowski
2025-08-21 12:20 ` Andrew Lunn
2025-08-21 12:50 ` Yangfl
2025-08-21 13:42 ` Andrew Lunn [this message]
2025-08-20 7:54 ` [net-next v5 2/3] net: dsa: tag_yt921x: add support for Motorcomm YT921x tags David Yang
2025-08-21 12:23 ` Andrew Lunn
2025-08-20 7:54 ` [net-next v5 3/3] net: dsa: yt921x: Add support for Motorcomm YT921x David Yang
2025-08-21 8:30 ` Russell King (Oracle)
2025-08-21 9:25 ` Yangfl
2025-08-21 10:00 ` Russell King (Oracle)
2025-08-21 10:14 ` Russell King (Oracle)
2025-08-21 12:19 ` Yangfl
2025-08-21 12:41 ` Andrew Lunn
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