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Date: Sat, 21 Mar 2020 17:41:24 +0100 From: Andrew Lunn <andrew@...n.ch> To: Dejin Zheng <zhengdejin5@...il.com> Cc: 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, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next v2 3/7] net: phy: introduce phy_read_mmd_poll_timeout macro On Fri, Mar 20, 2020 at 09:34:27PM +0800, Dejin Zheng wrote: > 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. > > Suggested-by: Andrew Lunn <andrew@...n.ch> > Signed-off-by: Dejin Zheng <zhengdejin5@...il.com> > --- > v1 -> v2: > - passed a phydev, device address and a reg to replace args... > parameter in phy_read_mmd_poll_timeout() by Andrew Lunn 's > suggestion. Andrew Lunn <andrew@...n.ch>, Thanks very much for > your help! > - handle phy_read_mmd return an error(the return value < 0) in > phy_read_mmd_poll_timeout(). Thanks Andrew again. > > include/linux/phy.h | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/include/linux/phy.h b/include/linux/phy.h > index 36d9dea04016..bb351f8b8769 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 +785,19 @@ 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, \ > + phydev, devad, regnum) \ > +({ \ > + int ret = 0; \ > + ret = read_poll_timeout(phy_read_mmd, val, cond || val < 0, sleep_us, \ > + timeout_us, phydev, devad, regnum); \ Hi Dejin You probably should have ( ) here to deal with precedence issues. (cond) || val < 0 Andrew
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