netdev - Re: [net-next PATCH 01/11] net: dsa: qca8k: add LEDs basic support

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Date:   Tue, 7 Mar 2023 18:57:10 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Lee Jones <lee@...nel.org>,
        linux-leds@...r.kernel.org
Subject: Re: [net-next PATCH 01/11] net: dsa: qca8k: add LEDs basic support

On Wed, Mar 08, 2023 at 12:16:13AM +0100, Andrew Lunn wrote:
> > +qca8k_setup_led_ctrl(struct qca8k_priv *priv)
> > +{
> > +	struct fwnode_handle *ports, *port;
> > +	int port_num;
> > +	int ret;
> > +
> > +	ports = device_get_named_child_node(priv->dev, "ports");
> > +	if (!ports) {
> > +		dev_info(priv->dev, "No ports node specified in device tree!\n");
> > +		return 0;
> > +	}
> > +
> > +	fwnode_for_each_child_node(ports, port) {
> > +		struct fwnode_handle *phy_node, *reg_port_node = port;
> > +
> > +		phy_node = fwnode_find_reference(port, "phy-handle", 0);
> > +		if (!IS_ERR(phy_node))
> > +			reg_port_node = phy_node;
> 
> I don't understand this bit. Why are you looking at the phy-handle?
> 
> > +
> > +		if (fwnode_property_read_u32(reg_port_node, "reg", &port_num))
> > +			continue;
> 
> I would of expect port, not reg_port_node. I'm missing something
> here....
> 

It's really not to implement ugly things like "reg - 1"

On qca8k the port index goes from 0 to 6.
0 is cpu port 1
1 is port0 at mdio reg 0
2 is port1 at mdio reg 1
...
6 is cpu port 2

Each port have a phy-handle that refer to a phy node with the correct
reg and that reflect the correct port index.

Tell me if this looks wrong, for qca8k we have qca8k_port_to_phy() and
at times we introduced the mdio thing to describe the port - 1 directly
in DT. If needed I can drop the additional fwnode and use this function
but I would love to use what is defined in DT thatn a simple - 1.

-- 
	Ansuel