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

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Message-ID: <64456292-42c8-c322-93bc-ab88d1f18329@gmail.com>
Date:   Mon, 27 May 2019 12:25:43 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...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 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.
-- 
Florian