linux-kernel - Re: [PATCH 1/7] net: dsa: add new driver for ar8xxx family

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Date:	Fri, 29 May 2015 04:08:54 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Mathieu Olivari <mathieu@...eaurora.org>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	davem@...emloft.net, f.fainelli@...il.com, linux@...ck-us.net,
	gang.chen.5i5j@...il.com, jiri@...nulli.us, leitec@...ticky.com,
	fabf@...net.be, alexander.h.duyck@...el.com,
	pavel.nakonechny@...tlab.ru, joe@...ches.com, sfeldma@...il.com,
	nbd@...nwrt.org, juhosg@...nwrt.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] net: dsa: add new driver for ar8xxx family

> +static int ar8xxx_set_pad_ctrl(struct dsa_switch *ds, int port, int mode)
> +{
> +	int reg;
> +
> +	switch (port) {
> +	case 0:
> +		reg = AR8327_REG_PORT0_PAD_CTRL;
> +		break;
> +	case 6:
> +		reg = AR8327_REG_PORT6_PAD_CTRL;
> +		break;
> +	default:
> +		pr_err("Can't set PAD_CTRL on port %d\n", port);
> +		return -EINVAL;
> +	}
> +
> +	/* DSA only supports 1 CPU port for now, so we'll take the assumption
> +	 * that P0 is connected to the CPU master_dev.
> +	 */

I don't like this assumption. Hardware i have with Marvell switches
has the CPU connected to ports 5, or 6, or 0.

Calling dsa_upstream_port() will tell you which is the CPU port.

	Andrew
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