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Miller" , "Eric Dumazet" , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiner Kallweit , Russell King , , Subject: [PATCH net-next v2 0/2] Add support for PIC64-HPSC/HX MDIO controller Date: Mon, 23 Mar 2026 15:02:52 -0700 Message-ID: <20260323220254.3822444-1-charles.perry@microchip.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Hello, This series adds a driver for the two MDIO controllers of PIC64-HPSC/HX. The hardware supports C22 and C45 but only C22 is implemented for now. This MDIO hardware is based on a Microsemi design supported in Linux by mdio-mscc-miim.c. However, The register interface is completely different with pic64hpsc, hence the need for a separate driver. The documentation recommends an input clock of 156.25MHz and a prescaler of 39, which yields an MDIO clock of 1.95MHz. This was tested on Microchip HB1301 evalkit which has a VSC8574 and a VSC8541 with clock frequencies of 0.6, 1.95 and 2.5 MHz. Thanks, Charles Changes in v2: - 1/2: Make "clocks" and "interrupts" required (Andrew) - 1/2: Add a default value to "clock-frequency" (Andrew) - 2/2: Remove #define for unused registers (Maxime) - 2/2: Add "c22" to clause 22 read/write ops (Maxime) - 2/2: Remove the call to platform_set_drvdata() (Andrew) - 2/2: Make the clock mandatory (Andrew) - 2/2: Use 2.5MHz if no clock-frequency was specified (Andrew) - 2/2: Change the error message for bad clock-frequency (Andrew) - 2/2: Fix a use without initialization on bus_freq (Andrew) Charles Perry (2): dt-bindings: net: document Microchip PIC64-HPSC/HX MDIO controller net: mdio: add a driver for PIC64-HPSC/HX MDIO controller .../net/microchip,pic64hpsc-mdio.yaml | 68 +++++++ drivers/net/mdio/Kconfig | 7 + drivers/net/mdio/Makefile | 1 + drivers/net/mdio/mdio-pic64hpsc.c | 192 ++++++++++++++++++ 4 files changed, 268 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/microchip,pic64hpsc-mdio.yaml create mode 100644 drivers/net/mdio/mdio-pic64hpsc.c -- 2.47.3