linux-kernel - [PATCH net-next v2 6/7] net: phy: introduce phy_read_poll

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Message-Id: <20200320133431.9354-7-zhengdejin5@gmail.com>
Date:   Fri, 20 Mar 2020 21:34:30 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, allison@...utok.net,
        corbet@....net, alexios.zavras@...el.com, broonie@...nel.org,
        tglx@...utronix.de, mchehab+samsung@...nel.org,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH net-next v2 6/7] net: phy: introduce phy_read_poll_timeout macro

it is sometimes necessary to poll a phy register by phy_read()
function until its value satisfies some condition. introduce
phy_read_poll_timeout() macros that do this.

Suggested-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
v1 -> v2:
	- pass a phydev and a regnum to replace args... parameter in
	  the phy_read_poll_timeout(), and also handle the
	  phy_read() function's return error.
 
 include/linux/phy.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index bb351f8b8769..ecee7e436f89 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -714,6 +714,19 @@ static inline int phy_read(struct phy_device *phydev, u32 regnum)
 	return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, regnum);
 }
 
+#define phy_read_poll_timeout(val, cond, sleep_us, timeout_us, phydev, regnum) \
+({ \
+	int ret = 0; \
+	ret = read_poll_timeout(phy_read, val, cond || val < 0, sleep_us, \
+				timeout_us, phydev, regnum); \
+	if (val <  0) \
+		ret = val; \
+	if (ret) \
+		phydev_err(phydev, "%s failed: %d\n", __func__, ret); \
+	ret; \
+})
+
+
 /**
  * __phy_read - convenience function for reading a given PHY register
  * @phydev: the phy_device struct
-- 
2.25.0