linux-kernel - Re: [net-next PATCH 12/13] drivers: net: dsa: qca8k: add support for pws config reg

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Date:   Thu, 7 Oct 2021 02:41:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 12/13] drivers: net: dsa: qca8k: add support for
 pws config reg

> +static int
> +qca8k_setup_of_pws_reg(struct qca8k_priv *priv)
> +{
> +	struct device_node *node = priv->dev->of_node;
> +	u32 val = 0;
> +
> +	if (priv->switch_id == QCA8K_ID_QCA8327)
> +		if (of_property_read_bool(node, "qca,package48"))
> +			val |= QCA8327_PWS_PACKAGE48_EN;

What does this actually do? How is PACKAGE48 different to normal mode?

> +
> +	if (of_property_read_bool(node, "qca,power-on-sel"))
> +		val |= QCA8K_PWS_POWER_ON_SEL;

What happens if you unconditionally do this? Why is a DT property
required?

> +
> +	if (of_property_read_bool(node, "qca,led-open-drain"))
> +		/* POWER_ON_SEL needs to be set when configuring led to open drain */
> +		val |= QCA8K_PWS_LED_OPEN_EN_CSR | QCA8K_PWS_POWER_ON_SEL;

This is getting into territory of adding LED support for PHYs, which
we want to do via the LED subsystem.

   Andrew