netdev - Re: [PATCH v8 2/3] net: hisilicon: new hip04 MDIO driver

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Date:	Mon, 21 Apr 2014 21:58:00 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Zhangfei Gao <zhangfei.gao@...aro.org>, davem@...emloft.net,
	linux@....linux.org.uk, arnd@...db.de, f.fainelli@...il.com,
	mark.rutland@....com, David.Laight@...LAB.COM,
	eric.dumazet@...il.com, xuwei5@...ilicon.com
CC:	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v8 2/3] net: hisilicon: new hip04 MDIO driver

Hello.

On 04/19/2014 05:12 AM, Zhangfei Gao wrote:

> Hisilicon hip04 platform mdio driver
> Reuse Marvell phy drivers/net/phy/marvell.c

> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
[...]

> diff --git a/drivers/net/ethernet/hisilicon/hip04_mdio.c b/drivers/net/ethernet/hisilicon/hip04_mdio.c
> new file mode 100644
> index 0000000..19826a3
> --- /dev/null
> +++ b/drivers/net/ethernet/hisilicon/hip04_mdio.c
> @@ -0,0 +1,185 @@
> +

    Empty line not needed here.

> +/* Copyright (c) 2014 Linaro Ltd.
> + * Copyright (c) 2014 Hisilicon Limited.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */

[...]

> +static int hip04_mdio_reset(struct mii_bus *bus)
> +{
> +	int temp, err, i;
> +
> +	for (i = 0; i < PHY_MAX_ADDR; i++) {
> +		hip04_mdio_write(bus, i, 22, 0);

    Why? What kind of a register this is? <uapi/linux/mii.h> tells me it's 
MII_SREVISION...

> +		temp = hip04_mdio_read(bus, i, MII_BMCR);

    You're not checking for error...

> +		temp |= BMCR_RESET;
> +		err = hip04_mdio_write(bus, i, MII_BMCR, temp);

    Hmm, why you're open coding BMCR reset? There's phy_init_hw() doing this 
correctly...

> +		if (err < 0)
> +			return err;
> +	}
> +
> +	mdelay(500);
> +	return 0;
> +}
> +
> +static int hip04_mdio_probe(struct platform_device *pdev)
> +{
> +	struct resource *r;
> +	struct mii_bus *bus;
> +	struct hip04_mdio_priv *priv;
> +	int ret;
> +
> +	bus = mdiobus_alloc_size(sizeof(struct hip04_mdio_priv));
> +	if (!bus) {
> +		dev_err(&pdev->dev, "Cannot allocate MDIO bus\n");
> +		return -ENOMEM;
> +	}
> +
> +	bus->name = "hip04_mdio_bus";
> +	bus->read = hip04_mdio_read;
> +	bus->write = hip04_mdio_write;
> +	bus->reset = hip04_mdio_reset;

    Ah... However I don't think it a good implementation of that bus method...

[...]

WBR, Sergei

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