Hi,
On 1/12/21 5:40 AM, Calvin Johnson wrote:
> Introduce ACPI mechanism to get PHYs registered on a MDIO bus and
> provide them to be connected to MAC.
>
> Describe properties "phy-handle" and "phy-mode".
>
> Signed-off-by: Calvin Johnson <calvin.johnson@xxxxxxxxxxx>
> ---
>
> Changes in v3: None
> Changes in v2:
> - Updated with more description in document
>
> Documentation/firmware-guide/acpi/dsd/phy.rst | 129 ++++++++++++++++++
> 1 file changed, 129 insertions(+)
> create mode 100644 Documentation/firmware-guide/acpi/dsd/phy.rst
>
> diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst
> new file mode 100644
> index 000000000000..a2e4fdcdbf53
> --- /dev/null
> +++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
> @@ -0,0 +1,129 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +=========================
> +MDIO bus and PHYs in ACPI
> +=========================
> +
> +The PHYs on an MDIO bus [1] are probed and registered using
> +fwnode_mdiobus_register_phy().
> +Later, for connecting these PHYs to MAC, the PHYs registered on the
> +mdiobus have to be referenced.
> +
> +UUID given below should be used as mentioned in the "Device Properties
The UUID given below
> +UUID For _DSD" [2] document.
> + - UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301
> +
> +This document introduces two _DSD properties that are to be used
> +for PHYs on the MDIO bus.[3]
> +
> +phy-handle
> +----------
> +For each MAC node, a device property "phy-handle" is used to reference
> +the PHY that is registered on an MDIO bus. This is mandatory for
> +network interfaces that have PHYs connected to MAC via MDIO bus.
> +
> +During the MDIO bus driver initialization, PHYs on this bus are probed
> +using the _ADR object as shown below and are registered on the mdio bus.
s/mdio/MDIO/ (please be consistent, as 3 lines above)
> +
> +::
> + Scope(\_SB.MDI0)
> + {
> + Device(PHY1) {
> + Name (_ADR, 0x1)
> + } // end of PHY1
> +
> + Device(PHY2) {
> + Name (_ADR, 0x2)
> + } // end of PHY2
> + }
> +
> +Later, during the MAC driver initialization, the registered PHY devices
> +have to be retrieved from the mdio bus. For this, MAC driver needs
ditto.
> +reference to the previously registered PHYs which are provided
> +using reference to the device as {\_SB.MDI0.PHY1}.
> +
> +phy-mode
> +--------
> +The "phy-mode" _DSD property is used to describe the connection to
> +the PHY. The valid values for "phy-mode" are defined in [4].
> +
> +
> +An ASL example of this is shown below.
> +
> +DSDT entry for MDIO node
> +------------------------
> +The MDIO bus has an SoC component(mdio controller) and a platform
component (MDIO controller)
> +component(PHYs on the mdiobus).
component (PHYs
> +
> +a) Silicon Component
> +This node describes the MDIO controller,MDI0
controller, MDI0
> +--------------------------------------------
and then one more '-', please.
> +::
> + Scope(_SB)
> + {
> + Device(MDI0) {
> + Name(_HID, "NXP0006")
> + Name(_CCA, 1)
> + Name(_UID, 0)
> + Name(_CRS, ResourceTemplate() {
> + Memory32Fixed(ReadWrite, MDI0_BASE, MDI_LEN)
> + Interrupt(ResourceConsumer, Level, ActiveHigh, Shared)
> + {
> + MDI0_IT
> + }
> + }) // end of _CRS for MDI0
> + } // end of MDI0
> + }
> +
> +b) Platform Component
> +This node defines the PHYs that are connected to the MDIO bus, MDI0
> +-------------------------------------------------------------------
[deletia]
thanks.
--
~Randy
You can't do anything without having to do something else first.
-- Belefant's Law
