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Date:   Thu, 13 Apr 2023 16:48:21 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Florian Fainelli <f.fainelli@gmail.com>
Cc:     Christian Marangi <ansuelsmth@gmail.com>,
        Pavel Machek <pavel@ucw.cz>, Lee Jones <lee@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Vladimir Oltean <olteanv@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        John Crispin <john@phrozen.org>, linux-leds@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-arm-msm@vger.kernel.org
Subject: Re: [net-next PATCH v6 06/16] net: phy: phy_device: Call into the
 PHY driver to set LED brightness
Message-ID: <9603636f-3296-4c6a-96ca-c522e91c1c4c@lunn.ch>
References: <20230327141031.11904-1-ansuelsmth@gmail.com>
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 <202ae4b9-8995-474a-1282-876078e15e47@gmail.com>
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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@lunn.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@lunn.ch>
> > Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> 
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.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