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<20260519165747.1288903-4-markus.stockhausen@gmx.de> <85d5f162-8999-43d4-b879-6e5e686246f7@lunn.ch> <01d801dce7c2$a0a08ba0$e1e1a2e0$@gmx.de> In-Reply-To: Subject: AW: [PATCH 3/9] net: mdio: realtek-rtl9300: Add ports to info structure Date: Tue, 19 May 2026 22:36:34 +0200 Message-ID: <029f01dce7cf$34595af0$9d0c10d0$@gmx.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQGwSt0WOf381P4OW8TiHCSlUsVjdQM24EKZAmkhHfYC6BYN1wKAihL1Abxy/sq2CNpx4A== Content-Language: de X-Provags-ID: V03:K1:9JO8EY0HRHQ7a/fRUOVZW4gGnUIRjFBSxiSnR4TCY7yTd/IG7uG x/KPmcyHKkfA29ilYGpxAELYg5MFiwyAQYb+q3XSLxbEnOjXDAuUvFjKyVM34xncr/nRP7h L8gEj0LHqBYNvAk6SUi4AzI6NKniZZk+CDP4qJC1a2yaVVrYMjmwtw1bBdQyoplmCzHklLA WqekBtduz6kUKjizKXWnQ== X-Spam-Flag: NO UI-OutboundReport: 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aDvNE7tQqiY6rdsLM0GSlaEUjOvqE+SKBz9ri2tMio+YpoCOkOVZ+aUSWqv6uPPPhJ6TpQ== > Von: Andrew Lunn =20 > Gesendet: Dienstag, 19. Mai 2026 22:14 > An: Markus Stockhausen > Betreff: Re: [PATCH 3/9] net: mdio: realtek-rtl9300: Add ports to info structure > . > > Where does this come from? > >=20 > > - The hardware has 1-4 SMI busses > > - Each bus serves up to 32 addresses > > - A switch has X physical ports > > - The mdio controller can only be fed with "physical port" > > So in general, the MDIO API uses an address in the range 0-31, as > defined in C22/C45. I would try to do any sort of mapping of ports to > MDIO addresses in a layer above MDIO. Maybe that is not possible, i > only partially remember the discussion about this hardware. But if it > is going to get more complex, i really would suggest pulling it out > into a layer above, and let the MDIO driver simply do MDIO. Having spent a few months to get all this sorted out I can say that the port concept is quite easy to understand and is already quite simple implemented. One only needs to know=20 the chain bus/address -> port -> bus/address=20 Current upstream codes uses 220 lines of code for only one=20 target. Downstream serves 4 devices with same quality and error handling with the following metrics: - 80 lines of code for central command runner - 160 lines for all 16 SOC specific read/read_c45/write/write_c45 function= s - 80 lines of code for 4 generic command feeder functions I finally want to add myself as maintainer for the driver. Just in case that helps for the descision. =20 Markus