From: Calvin Johnson <calvin.johnson@oss.nxp.com>
To: Jeremy Linton <jeremy.linton@arm.com>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Jon <jon@solid-run.com>,
Cristi Sovaiala <cristian.sovaiala@nxp.com>,
Ioana Ciornei <ioana.ciornei@nxp.com>,
Andrew Lunn <andrew@lunn.ch>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Madalin Bucur <madalin.bucur@oss.nxp.com>
Cc: netdev@vger.kernel.org, linux-acpi@vger.kernel.org,
linux.cj@gmail.com, Calvin Johnson <calvin.johnson@oss.nxp.com>,
Len Brown <lenb@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-kernel@vger.kernel.org
Subject: [net-next PATCH v2 2/3] Documentation: ACPI: DSD: Document MDIO PHY
Date: Wed, 1 Jul 2020 11:42:32 +0530 [thread overview]
Message-ID: <20200701061233.31120-3-calvin.johnson@oss.nxp.com> (raw)
In-Reply-To: <20200701061233.31120-1-calvin.johnson@oss.nxp.com>
Introduce ACPI mechanism to get PHYs registered on a MDIO bus and
provide them to be connected to MAC.
An ACPI node property "mdio-handle" is introduced to reference the
MDIO bus on which PHYs are registered with autoprobing method used
by mdiobus_register().
Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
Changes in v2: None
Documentation/firmware-guide/acpi/dsd/phy.rst | 40 +++++++++++++++++++
1 file changed, 40 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..78dcb0cacc7e
--- /dev/null
+++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
@@ -0,0 +1,40 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+MDIO bus and PHYs in ACPI
+=========================
+
+The PHYs on a mdiobus are probed and registered using mdiobus_register().
+Later, for connecting these PHYs to MAC, the PHYs registered on the
+mdiobus have to be referenced.
+
+For each MAC node, a property "mdio-handle" is used to reference the
+MDIO bus on which the PHYs are registered. On getting hold of the MDIO
+bus, use find_phy_device() to get the PHY connected to the MAC.
+
+
+An example of this is show below::
+
+ Scope(\_SB.MCE0.PR17) // 1G
+ {
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package (2) {"phy-channel", 1},
+ Package (2) {"phy-mode", "rgmii-id"},
+ Package (2) {"mdio-handle", Package (){\_SB.MDI0}}
+ }
+ })
+ }
+
+ Scope(\_SB.MCE0.PR18) // 1G
+ {
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package (2) {"phy-channel", 2},
+ Package (2) {"phy-mode", "rgmii-id"},
+ Package (2) {"mdio-handle", Package (){\_SB.MDI0}}
+ }
+ })
+ }
--
2.17.1
next prev parent reply other threads:[~2020-07-01 6:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-01 6:12 [net-next PATCH v2 0/3] ACPI support for dpaa2 MAC driver Calvin Johnson
2020-07-01 6:12 ` [net-next PATCH v2 1/3] net: phy: introduce find_phy_device() Calvin Johnson
2020-07-01 10:23 ` Andy Shevchenko
2020-07-01 13:24 ` Andrew Lunn
2020-07-01 6:12 ` Calvin Johnson [this message]
2020-07-01 10:27 ` [net-next PATCH v2 2/3] Documentation: ACPI: DSD: Document MDIO PHY Andy Shevchenko
2020-07-03 11:35 ` Calvin Johnson
2020-07-04 11:40 ` Andy Shevchenko
2020-07-01 13:16 ` Randy Dunlap
2020-07-01 13:30 ` Andrew Lunn
2020-07-01 6:12 ` [net-next PATCH v2 3/3] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver Calvin Johnson
2020-07-01 10:37 ` Andy Shevchenko
2020-07-02 8:48 ` Ioana Ciornei
2020-07-02 9:34 ` Andy Shevchenko
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