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

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Message-ID: <9603636f-3296-4c6a-96ca-c522e91c1c4c@lunn.ch>
Date:   Thu, 13 Apr 2023 16:48:21 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Christian Marangi <ansuelsmth@...il.com>,
        Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        John Crispin <john@...ozen.org>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [net-next PATCH v6 06/16] net: phy: phy_device: Call into the
 PHY driver to set LED brightness

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@...n.ch>
> > 
> > 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@...n.ch>
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> 
> > +	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