netdev - Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver

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Date:   Thu, 14 Apr 2022 19:55:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Clément Léger <clement.leger@...tlin.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>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        Laurent Gonzales <laurent.gonzales@....se.com>,
        Jean-Pierre Geslin <jean-pierre.geslin@....se.com>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1
 advanced 5 port switch driver

 +static int a5psw_mdio_reset(struct mii_bus *bus)
> +{
> +	struct a5psw *a5psw = bus->priv;
> +	unsigned long rate;
> +	unsigned long div;
> +	u32 cfgstatus;
> +
> +	rate = clk_get_rate(a5psw->hclk);
> +	div = ((rate / a5psw->mdio_freq) / 2);
> +	if (div >= 511 || div <= 5) {
> +		dev_err(a5psw->dev, "MDIO clock div %ld out of range\n", div);
> +		return -ERANGE;
> +	}
> +
> +	cfgstatus = FIELD_PREP(A5PSW_MDIO_CFG_STATUS_CLKDIV, div);
> +
> +	a5psw_reg_writel(a5psw, A5PSW_MDIO_CFG_STATUS, cfgstatus);

I don't see anything here which does an actual reset. So i think this
function has the wrong name. Please also pass the frequency as a
parameter, because at a quick glance it was not easy to see where it
was used. There does not seem to be any need to store it in a5psw.

> +static int a5psw_probe_mdio(struct a5psw *a5psw)
> +{
> +	struct device *dev = a5psw->dev;
> +	struct device_node *mdio_node;
> +	struct mii_bus *bus;
> +	int err;
> +
> +	if (of_property_read_u32(dev->of_node, "clock-frequency",
> +				 &a5psw->mdio_freq))
> +		a5psw->mdio_freq = A5PSW_MDIO_DEF_FREQ;
> +
> +	bus = devm_mdiobus_alloc(dev);
> +	if (!bus)
> +		return -ENOMEM;
> +
> +	bus->name = "a5psw_mdio";
> +	bus->read = a5psw_mdio_read;
> +	bus->write = a5psw_mdio_write;
> +	bus->reset = a5psw_mdio_reset;

As far as i can see, the read and write functions don't support
C45. Please return -EOPNOTSUPP if they are passed C45 addresses.

     Andrew