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phy: add common PHY properties support

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Add a new PHY_COMMON_PROPS library that provides helper functions for
PHY drivers to read standardized polarity properties from the device
tree node:

  - phy_get_rx_polarity() / phy_get_tx_polarity()
  - phy_get_manual_rx_polarity() / phy_get_manual_tx_polarity()

The dt-bindings/phy/phy.h header with PHY_POL_NORMAL, PHY_POL_INVERT,
and PHY_POL_AUTO constants is provided via dts/upstream/include, which
is already in the build include path.

Ported from Merge tag 'phy-for-7.0':
  git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy

Link: https://git.kernel.org/linus/e7556b59ba65179612bce3fa56bb53d1b4fb20db
Signed-off-by: Lucien.Jheng <lucienzx159@gmail.com>
This commit is contained in:
Lucien.Jheng
2026-04-25 16:06:47 +08:00
committed by Jerome Forissier
parent 5bb7ae8921
commit 9eca7fd0d3
4 changed files with 364 additions and 0 deletions
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69
include/linux/phy/phy-common-props.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* phy-common-props.h -- Common properties for generic PHYs
*
* Copyright 2025-2026 NXP
*/
#ifndef __PHY_COMMON_PROPS_H
#define __PHY_COMMON_PROPS_H
#include <dt-bindings/phy/phy.h>
#include <dm/ofnode.h>
/**
* phy_get_rx_polarity - Get RX polarity for PHY differential lane
* @node: Pointer to the PHY's device tree node.
* @mode_name: The name of the PHY mode to look up.
* @supported: Bit mask of PHY_POL_NORMAL, PHY_POL_INVERT and PHY_POL_AUTO
* @default_val: Default polarity value if property is missing
* @val: Pointer to returned polarity.
*
* Return: zero on success, negative error on failure.
*/
int phy_get_rx_polarity(ofnode node, const char *mode_name,
unsigned int supported, unsigned int default_val,
unsigned int *val);
/**
* phy_get_tx_polarity - Get TX polarity for PHY differential lane
* @node: Pointer to the PHY's device tree node.
* @mode_name: The name of the PHY mode to look up.
* @supported: Bit mask of PHY_POL_NORMAL, PHY_POL_INVERT and PHY_POL_AUTO
* @default_val: Default polarity value if property is missing
* @val: Pointer to returned polarity.
*
* Return: zero on success, negative error on failure.
*/
int phy_get_tx_polarity(ofnode node, const char *mode_name,
unsigned int supported, unsigned int default_val,
unsigned int *val);
/**
* phy_get_manual_rx_polarity - Get manual RX polarity for PHY differential lane
* @node: Pointer to the PHY's device tree node.
* @mode_name: The name of the PHY mode to look up.
* @val: Pointer to returned polarity.
*
* Helper for PHYs which do not support protocols with automatic RX polarity
* detection and correction.
*
* Return: zero on success, negative error on failure.
*/
int phy_get_manual_rx_polarity(ofnode node, const char *mode_name,
unsigned int *val);
/**
* phy_get_manual_tx_polarity - Get manual TX polarity for PHY differential lane
* @node: Pointer to the PHY's device tree node.
* @mode_name: The name of the PHY mode to look up.
* @val: Pointer to returned polarity.
*
* Helper for PHYs without any custom default value for the TX polarity.
*
* Return: zero on success, negative error on failure.
*/
int phy_get_manual_tx_polarity(ofnode node, const char *mode_name,
unsigned int *val);
#endif /* __PHY_COMMON_PROPS_H */