netdev - Re: [PATCH net-next 2/3] net: phy: add callback for custom interrupt handler to struct phy

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Date:   Mon, 27 May 2019 21:36:32 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/3] net: phy: add callback for custom interrupt
 handler to struct phy_driver

On 27.05.2019 21:25, Florian Fainelli wrote:
> 
> 
> On 5/27/2019 11:28 AM, Heiner Kallweit wrote:
>> The phylib interrupt handler handles link change events only currently.
>> However PHY drivers may want to use other interrupt sources too,
>> e.g. to report temperature monitoring events. Therefore add a callback
>> to struct phy_driver allowing PHY drivers to implement a custom
>> interrupt handler.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> Suggested-by: Russell King - ARM Linux admin <linux@...linux.org.uk>
>> ---
>>  drivers/net/phy/phy.c | 9 +++++++--
>>  include/linux/phy.h   | 3 +++
>>  2 files changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>> index 20955836c..8030d0a97 100644
>> --- a/drivers/net/phy/phy.c
>> +++ b/drivers/net/phy/phy.c
>> @@ -774,8 +774,13 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
>>  	if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
>>  		return IRQ_NONE;
>>  
>> -	/* reschedule state queue work to run as soon as possible */
>> -	phy_trigger_machine(phydev);
>> +	if (phydev->drv->handle_interrupt) {
>> +		if (phydev->drv->handle_interrupt(phydev))
> 
> If Russell is okay with such a model where the PHY state machine still
> manages the interrupts at large, and only calls a specific callback for
> specific even handling, that's fine. We might have to allow PHY drivers
> to let them specify what they want to get passed to
> request_threaded_irq(), or leave it to them to do it.
> 
This proposed easy model should be able to cover quite some use cases.
One constraint may be that interrupts are disabled if phylib state
machine isn't in a started state. Means most likely it's not able to
cover e.g. the requirement to allow temperature warning interrupts if
PHY is in state HALTED.