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net: phy: Add helper for mapping RGMII link speed to clock rate

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The RGMII interface supports three data rates: 10/100 Mbps
and 1 Gbps. These speeds correspond to clock frequencies
of 2.5/25 MHz and 125 MHz, respectively.

Many Ethernet drivers, including glues in stmmac, follow
a similar pattern of converting RGMII speed to clock frequency.

To simplify code, define the helper rgmii_clock(speed)
to convert connection speed to clock frequency.

Suggested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jan Petrous (OSS) <jan.petrous@oss.nxp.com>
Link: https://patch.msgid.link/20241205-upstream_s32cc_gmac-v8-4-ec1d180df815@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jan Petrous (OSS) 2024-12-05 17:43:01 +01:00 committed by Jakub Kicinski
parent cb09f61a9a
commit 386aa60abd
1 changed files with 23 additions and 0 deletions
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23
include/linux/phy.h
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@ -298,6 +298,29 @@ static inline const char *phy_modes(phy_interface_t interface)
}
}
/**
* rgmii_clock - map link speed to the clock rate
* @speed: link speed value
*
* Description: maps RGMII supported link speeds
* into the clock rates.
*
* Returns: clock rate or negative errno
*/
static inline long rgmii_clock(int speed)
{
switch (speed) {
case SPEED_10:
return 2500000;
case SPEED_100:
return 25000000;
case SPEED_1000:
return 125000000;
default:
return -EINVAL;
}
}
#define PHY_INIT_TIMEOUT 100000
#define PHY_FORCE_TIMEOUT 10