From: Randy Dunlap <rdunlap@infradead.org>
To: Calvin Johnson <calvin.johnson@oss.nxp.com>,
Grant Likely <grant.likely@arm.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Jeremy Linton <jeremy.linton@arm.com>,
Andrew Lunn <andrew@lunn.ch>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Cristi Sovaiala <cristian.sovaiala@nxp.com>,
Florin Laurentiu Chiculita <florinlaurentiu.chiculita@nxp.com>,
Ioana Ciornei <ioana.ciornei@nxp.com>,
Madalin Bucur <madalin.bucur@oss.nxp.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Marcin Wojtas <mw@semihalf.com>,
Pieter Jansen Van Vuuren <pieter.jansenvv@bamboosystems.io>,
Jon <jon@solid-run.com>
Cc: Diana Madalina Craciun <diana.craciun@nxp.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Laurentiu Tudor <laurentiu.tudor@nxp.com>,
linux-acpi@vger.kernel.org, linux.cj@gmail.com,
linux-arm-kernel@lists.infradead.org, Len Brown <lenb@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [net-next PATCH v3 01/15] Documentation: ACPI: DSD: Document MDIO PHY
Date: Mon, 18 Jan 2021 14:12:36 -0800 [thread overview]
Message-ID: <414bb8d0-df20-25f2-07a4-408fe22b0093@infradead.org> (raw)
In-Reply-To: <20210112134054.342-2-calvin.johnson@oss.nxp.com>
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@oss.nxp.com>
> ---
>
> 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
next prev parent reply other threads:[~2021-01-18 22:14 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 13:40 [net-next PATCH v3 00/15] ACPI support for dpaa2 driver Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 01/15] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson
2021-01-18 22:12 ` Randy Dunlap [this message]
2021-01-12 13:40 ` [net-next PATCH v3 02/15] net: phy: Introduce fwnode_mdio_find_device() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 03/15] net: phy: Introduce phy related fwnode functions Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 04/15] of: mdio: Refactor of_phy_find_device() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 05/15] net: phy: Introduce fwnode_get_phy_id() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 06/15] of: mdio: Refactor of_get_phy_id() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 07/15] net: mdiobus: Introduce fwnode_mdiobus_register_phy() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 08/15] of: mdio: Refactor of_mdiobus_register_phy() Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 09/15] device property: Introduce fwnode_get_id() Calvin Johnson
2021-01-12 15:48 ` Andy Shevchenko
2021-01-20 18:17 ` Rafael J. Wysocki
2021-01-20 18:45 ` Andy Shevchenko
2021-01-20 19:12 ` Rafael J. Wysocki
2021-01-12 17:30 ` Saravana Kannan
2021-01-12 18:03 ` Andy Shevchenko
2021-01-20 18:18 ` Rafael J. Wysocki
2021-01-20 18:52 ` Andy Shevchenko
2021-01-20 19:15 ` Rafael J. Wysocki
2021-01-20 20:01 ` Saravana Kannan
2021-01-22 16:34 ` Rafael J. Wysocki
2021-01-22 20:58 ` Saravana Kannan
2021-01-22 21:06 ` Andy Shevchenko
2021-01-22 21:07 ` Saravana Kannan
2021-01-15 10:47 ` Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 10/15] net: mdio: Add ACPI support code for mdio Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 11/15] net: mdiobus: Introduce fwnode_mdiobus_register() Calvin Johnson
2021-01-12 15:52 ` Andy Shevchenko
2021-01-12 13:40 ` [net-next PATCH v3 12/15] net/fsl: Use fwnode_mdiobus_register() Calvin Johnson
2021-01-12 15:53 ` Andy Shevchenko
2021-01-12 13:40 ` [net-next PATCH v3 13/15] phylink: introduce phylink_fwnode_phy_connect() Calvin Johnson
2021-01-12 15:55 ` Andy Shevchenko
2021-01-19 4:05 ` Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 14/15] net: phylink: Refactor phylink_of_phy_connect() Calvin Johnson
2021-01-12 15:57 ` Andy Shevchenko
2021-01-19 4:08 ` Calvin Johnson
2021-01-12 13:40 ` [net-next PATCH v3 15/15] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver Calvin Johnson
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