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net: phy: Add helper for getting MAC termination resistance

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Add helper which returns the MAC termination resistance value. Modifying
the resistance to an appropriate value can reduce signal reflections and
therefore improve signal quality.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://patch.msgid.link/20250416-dp83822-mac-impedance-v3-3-028ac426cddb@liebherr.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dimitri Fedrau 2025-04-16 19:14:49 +02:00 committed by Jakub Kicinski
parent 1de1390ee0
commit 145436ae01
2 changed files with 18 additions and 0 deletions
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15
drivers/net/phy/phy_device.c
View File

@ -2975,6 +2975,21 @@ int phy_get_tx_amplitude_gain(struct phy_device *phydev, struct device *dev,
}
EXPORT_SYMBOL_GPL(phy_get_tx_amplitude_gain);
/**
* phy_get_mac_termination - stores MAC termination in @val
* @phydev: phy_device struct
* @dev: pointer to the devices device struct
* @val: MAC termination
*
* Returns: 0 on success, < 0 on failure
*/
int phy_get_mac_termination(struct phy_device *phydev, struct device *dev,
u32 *val)
{
return phy_get_u32_property(dev, "mac-termination-ohms", val);
}
EXPORT_SYMBOL_GPL(phy_get_mac_termination);
static int phy_led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness value)
{

3
include/linux/phy.h
View File

@ -2040,6 +2040,9 @@ int phy_get_tx_amplitude_gain(struct phy_device *phydev, struct device *dev,
enum ethtool_link_mode_bit_indices linkmode,
u32 *val);
int phy_get_mac_termination(struct phy_device *phydev, struct device *dev,
u32 *val);
void phy_resolve_pause(unsigned long *local_adv, unsigned long *partner_adv,
bool *tx_pause, bool *rx_pause);