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net: phy: Add phy_read_mmd_poll_timeout() from Linux

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Add phy_read_mmd_poll_timeout() from Linux 5.7.y as of commit
bd971ff0b7392 ("net: phy: introduce phy_read_mmd_poll_timeout macro")
This is used by the upcoming Marvell 10G PHY driver.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Marek Vasut 2023-03-19 18:08:08 +01:00
parent 87b7502824
commit 1f614d5246
1 changed files with 31 additions and 0 deletions
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31
include/phy.h
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@ -282,6 +282,37 @@ static inline ofnode phy_get_ofnode(struct phy_device *phydev)
return dev_ofnode(phydev->dev);
}
/**
* phy_read_mmd_poll_timeout - Periodically poll a PHY register until a
* condition is met or a timeout occurs
*
* @phydev: The phy_device struct
* @devaddr: The MMD to read from
* @regnum: The register on the MMD to read
* @val: Variable to read the register into
* @cond: Break condition (usually involving @val)
* @sleep_us: Maximum time to sleep between reads in us (0
* tight-loops). Should be less than ~20ms since usleep_range
* is used (see Documentation/timers/timers-howto.rst).
* @timeout_us: Timeout in us, 0 means never timeout
* @sleep_before_read: if it is true, sleep @sleep_us before read.
* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
* case, the last read value at @args is stored in @val. Must not
* be called from atomic context if sleep_us or timeout_us are used.
*/
#define phy_read_mmd_poll_timeout(phydev, devaddr, regnum, val, cond, \
sleep_us, timeout_us, sleep_before_read) \
({ \
int __ret = read_poll_timeout(phy_read_mmd, val, (cond) || val < 0, \
sleep_us, timeout_us, \
phydev, devaddr, regnum); \
if (val < 0) \
__ret = val; \
if (__ret) \
dev_err(phydev->dev, "%s failed: %d\n", __func__, __ret); \
__ret; \
})
int phy_read(struct phy_device *phydev, int devad, int regnum);
int phy_write(struct phy_device *phydev, int devad, int regnum, u16 val);
void phy_mmd_start_indirect(struct phy_device *phydev, int devad, int regnum);