netdev - [PATCH net-next 3/7] net: phy: introduce phy_read_mmd_poll

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Date:   Fri, 20 Mar 2020 00:39:06 +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, tglx@...utronix.de,
        broonie@...nel.org, corbet@....net, mchehab+samsung@...nel.org,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH net-next 3/7] net: phy: introduce phy_read_mmd_poll_timeout macro

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

Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 include/linux/phy.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 36d9dea04016..a30e9008647f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -24,6 +24,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/u64_stats_sync.h>
 #include <linux/irqreturn.h>
+#include <linux/iopoll.h>
 
 #include <linux/atomic.h>
 
@@ -784,6 +785,9 @@ static inline int __phy_modify_changed(struct phy_device *phydev, u32 regnum,
  */
 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum);
 
+#define phy_read_mmd_poll_timeout(val, cond, sleep_us, timeout_us, args...) \
+	read_poll_timeout(phy_read_mmd, val, cond, sleep_us, timeout_us, args)
+
 /**
  * __phy_read_mmd - Convenience function for reading a register
  * from an MMD on a given PHY.
-- 
2.25.0