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Date:	Thu, 10 Jul 2014 14:37:38 +0200
From:	Gerlando Falauto <gerlando.falauto@...mile.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>,
	netdev@...r.kernel.org
CC:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	kishon@...com, Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH V3] net/dt: Add support for overriding phy configuration
 from device tree

Hi Matthew,

On 01/17/2014 11:57 PM, Matthew Garrett wrote:
> Some hardware may be broken in interesting and board-specific ways, such
> that various bits of functionality don't work. This patch provides a
> mechanism for overriding mii registers during init based on the contents of
> the device tree data, allowing board-specific fixups without having to
> pollute generic code.

[six months later]
I assume nothing ever came out of this patch... is that right?

Thank you,
Gerlando

>
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> ---
>
> V3: Break the main function out into some helper functions and store the
> values in some structs.
>
>   Documentation/devicetree/bindings/net/phy.txt | 21 +++++++
>   drivers/net/phy/phy_device.c                  | 29 ++++++++-
>   drivers/of/of_net.c                           | 87 +++++++++++++++++++++++++++
>   include/linux/of_net.h                        | 12 ++++
>   4 files changed, 148 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
> index 7cd18fb..fc50f02 100644
> --- a/Documentation/devicetree/bindings/net/phy.txt
> +++ b/Documentation/devicetree/bindings/net/phy.txt
> @@ -23,6 +23,21 @@ Optional Properties:
>     assume clause 22. The compatible list may also contain other
>     elements.
>
> +The following properties may be added to either the phy node or the parent
> +ethernet device. If not present, the hardware defaults will be used.
> +
> +- phy-mii-advertise-10half: 1 to advertise half-duplex 10MBit, 0 to disable
> +- phy-mii-advertise-10full: 1 to advertise full-duplex 10MBit, 0 to disable
> +- phy-mii-advertise-100half: 1 to advertise half-duplex 100MBit, 0 to disable
> +- phy-mii-advertise-100full: 1 to advertise full-duplex 100MBit, 0 to disable
> +- phy-mii-advertise-100base4: 1 to advertise 100base4, 0 to disable
> +- phy-mii-advertise-1000half: 1 to advertise half-duplex 1000MBit, 0 to disable
> +- phy-mii-advertise-1000full: 1 to advertise full-duplex 1000MBit, 0 to disable
> +- phy-mii-manual-master: 1 to enable manual master/slave configuration, 0
> +  to disable manual master/slave configuration
> +- phy-mii-as-master: 1 to configure phy to act as master, 0 to configure phy
> +  to act as slave. Ignored if manual master/slave configuration is not enabled.
> +
>   Example:
>
>   ethernet-phy@0 {
> @@ -32,4 +47,10 @@ ethernet-phy@0 {
>   	interrupts = <35 1>;
>   	reg = <0>;
>   	device_type = "ethernet-phy";
> +	// Disable advertising of full duplex 1000MBit
> +	phy-mii-advertise-1000full = <0>;
> +	// Force manual phy master/slave configuration
> +	phy-mii-manual-master = <1>;
> +	// Forcibly configure phy as slave
> +	phy-mii-as-master = <0>;
>   };
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index d6447b3..91793bc 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -33,6 +33,7 @@
>   #include <linux/mii.h>
>   #include <linux/ethtool.h>
>   #include <linux/phy.h>
> +#include <linux/of_net.h>
>
>   #include <asm/io.h>
>   #include <asm/irq.h>
> @@ -497,6 +498,28 @@ void phy_disconnect(struct phy_device *phydev)
>   }
>   EXPORT_SYMBOL(phy_disconnect);
>
> +int phy_override_from_of(struct phy_device *phydev)
> +{
> +	int reg, regval;
> +	u16 val, mask;
> +
> +	/* Check for phy register overrides from OF */
> +	for (reg = 0; reg < 16; reg++) {
> +		if (!of_get_mii_register(phydev, reg, &val, &mask)) {
> +			if (!mask)
> +				continue;
> +			regval = phy_read(phydev, reg);
> +			if (regval < 0)
> +				continue;
> +			regval &= ~mask;
> +			regval |= val;
> +			phy_write(phydev, reg, regval);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>   int phy_init_hw(struct phy_device *phydev)
>   {
>   	int ret;
> @@ -508,7 +531,11 @@ int phy_init_hw(struct phy_device *phydev)
>   	if (ret < 0)
>   		return ret;
>
> -	return phydev->drv->config_init(phydev);
> +	ret = phydev->drv->config_init(phydev);
> +	if (ret < 0)
> +		return ret;
> +
> +	return phy_override_from_of(phydev);
>   }
>
>   /**
> diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
> index 8f9be2e..75751b7 100644
> --- a/drivers/of/of_net.c
> +++ b/drivers/of/of_net.c
> @@ -93,3 +93,90 @@ const void *of_get_mac_address(struct device_node *np)
>   	return NULL;
>   }
>   EXPORT_SYMBOL(of_get_mac_address);
> +
> +struct mii_override {
> +	char *prop;
> +	u32 supported;
> +	u16 value;
> +};
> +
> +static struct mii_override mii_advertise_override[] = {
> +	{ "phy-mii-advertise-10half", SUPPORTED_10baseT_Half,
> +	  ADVERTISE_10HALF },
> +	{ "phy-mii-advertise-10full", SUPPORTED_10baseT_Full,
> +	  ADVERTISE_10FULL },
> +	{ "phy-mii-advertise-100half", SUPPORTED_100baseT_Half,
> +	  ADVERTISE_100HALF },
> +	{ "phy-mii-advertise-100full", SUPPORTED_100baseT_Full,
> +	  ADVERTISE_100FULL },
> +	{ "phy-mii-advertise-100base4", 0, ADVERTISE_100BASE4 },
> +	{ NULL },
> +};
> +
> +static struct mii_override mii_gigabit_override[] = {
> +	{ "phy-mii-advertise-1000half", SUPPORTED_1000baseT_Half,
> +	  ADVERTISE_1000HALF },
> +	{ "phy-mii-advertise-1000full", SUPPORTED_1000baseT_Full,
> +	  ADVERTISE_1000FULL },
> +	{ "phy-mii-as-master", 0, CTL1000_AS_MASTER },
> +	{ "phy-mii-manual-master", 0, CTL1000_ENABLE_MASTER },
> +	{ NULL },
> +};
> +
> +static void mii_handle_override(struct mii_override *override_list,
> +				struct phy_device *phydev, u16 *val, u16 *mask)
> +{
> +	struct device *dev = &phydev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct mii_override *override;
> +	u32 tmp;
> +
> +	if (!np && dev->parent->of_node)
> +		np = dev->parent->of_node;
> +
> +	if (!np)
> +		return;
> +
> +	for (override = &override_list[0]; override->prop != NULL; override++) {
> +		if (!of_property_read_u32(np, override->prop, &tmp)) {
> +			if (tmp) {
> +				*val |= override->value;
> +				phydev->advertising |= override->supported;
> +			} else {
> +				phydev->advertising &= ~(override->supported);
> +			}
> +
> +			*mask |= override->value;
> +		}
> +	}
> +
> +	return;
> +}
> +
> +/**
> + * Provide phy register overrides from the device tree. Some hardware may
> + * be broken in interesting and board-specific ways, so we want a mechanism
> + * for the board data to provide overrides for default values. This should be
> + * called during phy init.
> + */
> +int of_get_mii_register(struct phy_device *phydev, int reg, u16 *val,
> +			u16 *mask)
> +{
> +	*val = 0;
> +	*mask = 0;
> +
> +	switch (reg) {
> +	case MII_ADVERTISE:
> +		mii_handle_override(mii_advertise_override, phydev, val, mask);
> +		break;
> +
> +	case MII_CTRL1000:
> +		mii_handle_override(mii_gigabit_override, phydev, val, mask);
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +	return 0;
> +}
> +EXPORT_SYMBOL(of_get_mii_register);
> diff --git a/include/linux/of_net.h b/include/linux/of_net.h
> index 34597c8..2e478bc 100644
> --- a/include/linux/of_net.h
> +++ b/include/linux/of_net.h
> @@ -7,10 +7,14 @@
>   #ifndef __LINUX_OF_NET_H
>   #define __LINUX_OF_NET_H
>
> +#include <linux/phy.h>
> +
>   #ifdef CONFIG_OF_NET
>   #include <linux/of.h>
>   extern int of_get_phy_mode(struct device_node *np);
>   extern const void *of_get_mac_address(struct device_node *np);
> +extern int of_get_mii_register(struct phy_device *np, int reg, u16 *val,
> +			       u16 *mask);
>   #else
>   static inline int of_get_phy_mode(struct device_node *np)
>   {
> @@ -21,6 +25,14 @@ static inline const void *of_get_mac_address(struct device_node *np)
>   {
>   	return NULL;
>   }
> +static inline int of_get_mii_register(struct phy_device *np, int reg, u16 *val,
> +				      u16 *mask)
> +{
> +	*val = 0;
> +	*mask = 0;
> +
> +	return -EINVAL;
> +}
>   #endif
>
>   #endif /* __LINUX_OF_NET_H */
>

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