netdev - Re: [PATCH v2] drivers: phy: Add Cortina CS4340 driver

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Date:   Wed, 24 May 2017 14:58:30 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Bogdan Purcareata <bogdan.purcareata@....com>
Cc:     f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers: phy: Add Cortina CS4340 driver

On Wed, May 24, 2017 at 09:25:48AM +0000, Bogdan Purcareata wrote:
> Add basic support for Cortina PHY drivers. Support only CS4340 for now.
> The phys are not compatible with IEEE 802.3 clause 45 registers. Implement
> proper read_status support, so that phy polling does not cause bus
> register access errors.
> 
> The driver should be described using the "ethernet-phy-id" device tree
> compatible.

Hi Bogdan

Thanks for testing that ethernet-phy-id works.

I suggest you write a
Documentation/devicetree/binding/net/phy/cortina.txt giving an example
device tree node.

> 
> Signed-off-by: Bogdan Purcareata <bogdan.purcareata@....com>
> ---
> v1 -> v2:
> - Rename "mdio-cortina.c" to "cortina.c" since it's a phy driver.
> - Test probing based on the "ethernet-phy-id" compatible. In the previous
>   version, getting the phy_id via get_phy_c45_ids() involved an additional
>   hack. Drop that approach and document probing in the commit message.
> 
>  drivers/net/phy/Kconfig   |  5 +++
>  drivers/net/phy/Makefile  |  1 +
>  drivers/net/phy/cortina.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 96 insertions(+)
>  create mode 100644 drivers/net/phy/cortina.c
> 
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 22dea7f..ad09e2d 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -240,6 +240,11 @@ config CICADA_PHY
>  	---help---
>  	  Currently supports the cis8204
>  
> +config CORTINA_PHY
> +	tristate "Cortina quad-10G Ethernet PHY"
> +	---help---
> +	  Currently supports the CS4340 phy.
> +
>  config DAVICOM_PHY
>  	tristate "Davicom PHYs"
>  	---help---
> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index 79365be..0de3e20 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -47,6 +47,7 @@ obj-$(CONFIG_BCM_CYGNUS_PHY)	+= bcm-cygnus.o
>  obj-$(CONFIG_BCM_NET_PHYLIB)	+= bcm-phy-lib.o
>  obj-$(CONFIG_BROADCOM_PHY)	+= broadcom.o
>  obj-$(CONFIG_CICADA_PHY)	+= cicada.o
> +obj-$(CONFIG_CORTINA_PHY)	+= cortina.o
>  obj-$(CONFIG_DAVICOM_PHY)	+= davicom.o
>  obj-$(CONFIG_DP83640_PHY)	+= dp83640.o
>  obj-$(CONFIG_DP83848_PHY)	+= dp83848.o
> diff --git a/drivers/net/phy/cortina.c b/drivers/net/phy/cortina.c
> new file mode 100644
> index 0000000..6f054ed
> --- /dev/null
> +++ b/drivers/net/phy/cortina.c
> @@ -0,0 +1,90 @@
> +/*
> + *    Based on code from Cortina Systems, Inc.
> + *
> + *    Copyright 2011 Cortina Systems, Inc.
> + *    Copyright 2017 NXP
> + *
> + *    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.
> + *
> + *    This program is distributed in the hope that it will be useful,
> + *    but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *    GNU General Public License for more details.
> + *
> + */
> +#include <linux/module.h>
> +#include <linux/phy.h>
> +
> +#define PHY_ID_CS4340	0x13e51002
> +
> +#define CORTINA_GPIO_GPIO_INTS				0x16D
> +
> +static int cortina_read_x(struct phy_device *phydev, int off, u16 regnum)
> +{
> +	return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr + off,
> +			    MII_ADDR_C45 | regnum);
> +}
> +
> +static int cortina_read(struct phy_device *phydev, u16 regnum)
> +{
> +	return cortina_read_x(phydev, 0, regnum);
> +}
> +
> +static int cortina_config_aneg(struct phy_device *phydev)
> +{
> +	phydev->supported = SUPPORTED_10000baseT_Full;
> +	phydev->advertising = SUPPORTED_10000baseT_Full;
> +
> +	return 0;
> +}
> +
> +static int cortina_read_status(struct phy_device *phydev)
> +{
> +	int gpio_int_status;
> +	int ret = 0;

I think there needs to be some explanation here. What exactly are you
using to indicate link up? What does CORTINA_GPIO_GPIO_INTS mean?

> +	gpio_int_status = cortina_read(phydev, CORTINA_GPIO_GPIO_INTS);
> +	if (gpio_int_status < 0) {
> +		ret = gpio_int_status;
> +		goto err;
> +	}
> +
> +	if (gpio_int_status & 0x8) {
> +		phydev->speed = SPEED_10000;
> +		phydev->duplex = DUPLEX_FULL;
> +		phydev->link = 1;
> +	} else {
> +		phydev->link = 0;
> +	}
> +
> +err:
> +	return ret;
> +}
> +
> +static int cortina_soft_reset(struct phy_device *phydev)
> +{
> +	return 0;
> +}
> +
> +static struct phy_driver cortina_driver[] = {
> +{
> +	.phy_id         = PHY_ID_CS4340,
> +	.phy_id_mask    = 0xffffffff,
> +	.name           = "Cortina CS4340",
> +	.config_aneg    = cortina_config_aneg,
> +	.read_status    = cortina_read_status,
> +	.soft_reset     = cortina_soft_reset,
> +},
> +};

Having two } at the same indentation level seems odd. Please can you
fix this.

Thanks
	Andrew

> +
> +module_phy_driver(cortina_driver);
> +
> +static struct mdio_device_id __maybe_unused cortina_tbl[] = {
> +	{ PHY_ID_CS4340, 0xffffffff},
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(mdio, cortina_tbl);
> -- 
> 1.9.1
>