| From: |
| Charles Perry <charles.perry-AT-microchip.com> |
| To: |
| <netdev-AT-vger.kernel.org> |
| 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> |
| Cc: |
| Charles Perry <charles.perry-AT-microchip.com>, Andrew Lunn <andrew+netdev-AT-lunn.ch>, "David S. Miller" <davem-AT-davemloft.net>, "Eric Dumazet" <edumazet-AT-google.com>, Jakub Kicinski <kuba-AT-kernel.org>, Paolo Abeni <pabeni-AT-redhat.com>, Rob Herring <robh-AT-kernel.org>, Krzysztof Kozlowski <krzk+dt-AT-kernel.org>, Conor Dooley <conor+dt-AT-kernel.org>, Heiner Kallweit <hkallweit1-AT-gmail.com>, Russell King <linux-AT-armlinux.org.uk>, <devicetree-AT-vger.kernel.org>, <linux-kernel-AT-vger.kernel.org> |
| Archive-link: |
| Article |
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
