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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
%YAML 1.2
---
$id: "http://devicetree.org/schemas/phy/ti,phy-gmii-sel.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
title: CPSW Port's Interface Mode Selection PHY Tree Bindings
maintainers:
- Kishon Vijay Abraham I <kishon@ti.com>
description: |
TI am335x/am437x/dra7(am5)/dm814x CPSW3G Ethernet Subsystem supports
two 10/100/1000 Ethernet ports with selectable G/MII, RMII, and RGMII interfaces.
The interface mode is selected by configuring the MII mode selection register(s)
(GMII_SEL) in the System Control Module chapter (SCM). GMII_SEL register(s) and
bit fields placement in SCM are different between SoCs while fields meaning
is the same.
+--------------+
+-------------------------------+ |SCM |
| CPSW | | +---------+ |
| +--------------------------------+gmii_sel | |
| | | | +---------+ |
| +----v---+ +--------+ | +--------------+
| |Port 1..<--+-->GMII/MII<------->
| | | | | | |
| +--------+ | +--------+ |
| | |
| | +--------+ |
| | | RMII <------->
| +--> | |
| | +--------+ |
| | |
| | +--------+ |
| | | RGMII <------->
| +--> | |
| +--------+ |
+-------------------------------+
CPSW Port's Interface Mode Selection PHY describes MII interface mode between
CPSW Port and Ethernet PHY which depends on Eth PHY and board configuration.
|
CPSW Port's Interface Mode Selection PHY device should defined as child device
of SCM node (scm_conf) and can be attached to each CPSW port node using standard
PHY bindings.
properties:
compatible:
enum:
- ti,am3352-phy-gmii-sel
- ti,dra7xx-phy-gmii-sel
- ti,am43xx-phy-gmii-sel
- ti,dm814-phy-gmii-sel
- ti,am654-phy-gmii-sel
reg:
maxItems: 1
'#phy-cells': true
allOf:
- if:
properties:
compatible:
contains:
enum:
- ti,dra7xx-phy-gmii-sel
- ti,dm814-phy-gmii-sel
- ti,am654-phy-gmii-sel
then:
properties:
'#phy-cells':
const: 1
description: CPSW port number (starting from 1)
- if:
properties:
compatible:
contains:
enum:
- ti,am3352-phy-gmii-sel
- ti,am43xx-phy-gmii-sel
then:
properties:
'#phy-cells':
const: 2
description: |
- CPSW port number (starting from 1)
- RMII refclk mode
required:
- compatible
- reg
- '#phy-cells'
additionalProperties: false
examples:
- |
phy_gmii_sel: phy-gmii-sel@650 {
compatible = "ti,am3352-phy-gmii-sel";
reg = <0x650 0x4>;
#phy-cells = <2>;
};
|
