linux-kernel - Re: [PATCH RFC leds + net-next v4 1/2] net: phy: add API for LEDs controlled by PHY HW

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Date:   Tue, 28 Jul 2020 19:28:38 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-leds@...r.kernel.org,
        Pavel Machek <pavel@....cz>, jacek.anaszewski@...il.com,
        Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC leds + net-next v4 1/2] net: phy: add API for LEDs
 controlled by PHY HW

On Tue, 28 Jul 2020 18:18:00 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > +static int of_phy_register_led(struct phy_device *phydev, struct device_node *np)
> > +{
> > +	struct led_init_data init_data = {};
> > +	struct phy_device_led *led;
> > +	u32 reg;
> > +	int ret;
> > +
> > +	ret = of_property_read_u32(np, "reg", &reg);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	led = devm_kzalloc(&phydev->mdio.dev, sizeof(struct phy_device_led), GFP_KERNEL);
> > +	if (!led)
> > +		return -ENOMEM;
> > +
> > +	led->cdev.brightness_set_blocking = phy_led_brightness_set;
> > +	led->cdev.trigger_type = &phy_hw_led_trig_type;
> > +	led->addr = reg;
> > +
> > +	of_property_read_string(np, "linux,default-trigger", &led->cdev.default_trigger);  
> 
> Hi Marek
> 
> I think we need one more optional property. If the trigger has been
> set to the PHY hardware trigger, we then should be able to set which
> of the different blink patterns we want the LED to use. I guess most
> users will never actually make use of the sys/class/led interface, if
> the default in device tree is sensible. But that requires DT can fully
> configure the LED.
> 
>    Andrew

Yes, I also thought about that. We have the linux,default-trigger
property, so maybe we could add linux,default-hw-control-mode property
as well.

Marek