Re: [net-next PATCH v6 06/16] net: phy: phy_device: Call into the PHY driver to set LED brightness

[Andrew Lunn]

On Thu, Apr 13, 2023 at 06:57:51AM -0700, Florian Fainelli wrote:
> 
> 
> On 3/27/2023 7:10 AM, Christian Marangi wrote:
> > From: Andrew Lunn <andrew@xxxxxxx>
> > 
> > Linux LEDs can be software controlled via the brightness file in /sys.
> > LED drivers need to implement a brightness_set function which the core
> > will call. Implement an intermediary in phy_device, which will call
> > into the phy driver if it implements the necessary function.
> > 
> > Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
> > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
> 
> Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> 
> > +	int (*led_brightness_set)(struct phy_device *dev,
> > +				  u32 index, enum led_brightness value);
> 
> I think I would have made this an u8, 4 billion LEDs, man, that's a lot!

That can be done. We need to change:

        err = of_property_read_u32(led, "reg", &phyled->index);
        if (err)
                return err;

to a u8, to avoid overflow problems in other places. It looks like
of_property_read_u8() does the correct thing if somebody tried to use
4 billion - 1.

  Andrew