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Date: Mon, 31 Aug 2015 15:56:53 +0200
From: Andrew Lunn <andrew@...n.ch>
To: netdev <netdev@...r.kernel.org>, Stas Sergeev <stsp@...t.ru>
Cc: Andrew Lunn <andrew@...n.ch>
Subject: [Patch v2 RFT net-next 8/9] phy: fixed_phy: Add gpio to determine link up/down.
An SFP module may have a link up/down status pin which can be
connection to a GPIO line of the host. Add support for reading such an
GPIO in the fixed_phy driver.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
.../devicetree/bindings/net/fixed-link.txt | 14 +++++++++++-
Documentation/networking/stmmac.txt | 2 +-
arch/m68k/coldfire/m5272.c | 2 +-
arch/mips/ar7/platform.c | 5 +++--
arch/mips/bcm47xx/setup.c | 2 +-
drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 +-
drivers/net/phy/fixed_phy.c | 26 +++++++++++++++++++---
drivers/of/of_mdio.c | 13 ++++++++---
include/linux/phy_fixed.h | 8 +++++--
9 files changed, 59 insertions(+), 15 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/fixed-link.txt b/Documentation/devicetree/bindings/net/fixed-link.txt
index 82bf7e0f47b6..ec5d889fe3d8 100644
--- a/Documentation/devicetree/bindings/net/fixed-link.txt
+++ b/Documentation/devicetree/bindings/net/fixed-link.txt
@@ -17,6 +17,8 @@ properties:
enabled.
* 'asym-pause' (boolean, optional), to indicate that asym_pause should
be enabled.
+* 'link-gpios' ('gpio-list', optional), to indicate if a gpio can be read
+ to determine if the link is up.
Old, deprecated 'fixed-link' binding:
@@ -30,7 +32,7 @@ Old, deprecated 'fixed-link' binding:
- e: asymmetric pause configuration: 0 for no asymmetric pause, 1 for
asymmetric pause
-Example:
+Examples:
ethernet@0 {
...
@@ -40,3 +42,13 @@ ethernet@0 {
};
...
};
+
+ethernet@1 {
+ ...
+ fixed-link {
+ speed = <1000>;
+ pause;
+ link-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+ };
+ ...
+};
diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
index 2903b1cf4d70..d64a14714236 100644
--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt
@@ -254,7 +254,7 @@ static struct fixed_phy_status stmmac0_fixed_phy_status = {
During the board's device_init we can configure the first
MAC for fixed_link by calling:
- fixed_phy_add(PHY_POLL, 1, &stmmac0_fixed_phy_status));)
+ fixed_phy_add(PHY_POLL, 1, &stmmac0_fixed_phy_status, -1);
and the second one, with a real PHY device attached to the bus,
by using the stmmac_mdio_bus_data structure (to provide the id, the
reset procedure etc).
diff --git a/arch/m68k/coldfire/m5272.c b/arch/m68k/coldfire/m5272.c
index b15219ed22bf..c525e4c08f84 100644
--- a/arch/m68k/coldfire/m5272.c
+++ b/arch/m68k/coldfire/m5272.c
@@ -126,7 +126,7 @@ static struct fixed_phy_status nettel_fixed_phy_status __initdata = {
static int __init init_BSP(void)
{
m5272_uarts_init();
- fixed_phy_add(PHY_POLL, 0, &nettel_fixed_phy_status);
+ fixed_phy_add(PHY_POLL, 0, &nettel_fixed_phy_status, -1);
return 0;
}
diff --git a/arch/mips/ar7/platform.c b/arch/mips/ar7/platform.c
index be9ff1673ded..298b97715d5f 100644
--- a/arch/mips/ar7/platform.c
+++ b/arch/mips/ar7/platform.c
@@ -679,7 +679,8 @@ static int __init ar7_register_devices(void)
}
if (ar7_has_high_cpmac()) {
- res = fixed_phy_add(PHY_POLL, cpmac_high.id, &fixed_phy_status);
+ res = fixed_phy_add(PHY_POLL, cpmac_high.id,
+ &fixed_phy_status, -1);
if (!res) {
cpmac_get_mac(1, cpmac_high_data.dev_addr);
@@ -692,7 +693,7 @@ static int __init ar7_register_devices(void)
} else
cpmac_low_data.phy_mask = 0xffffffff;
- res = fixed_phy_add(PHY_POLL, cpmac_low.id, &fixed_phy_status);
+ res = fixed_phy_add(PHY_POLL, cpmac_low.id, &fixed_phy_status, -1);
if (!res) {
cpmac_get_mac(0, cpmac_low_data.dev_addr);
res = platform_device_register(&cpmac_low);
diff --git a/arch/mips/bcm47xx/setup.c b/arch/mips/bcm47xx/setup.c
index 98c075f81795..17503a05938e 100644
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -263,7 +263,7 @@ static int __init bcm47xx_register_bus_complete(void)
bcm47xx_leds_register();
bcm47xx_workarounds();
- fixed_phy_add(PHY_POLL, 0, &bcm47xx_fixed_phy_status);
+ fixed_phy_add(PHY_POLL, 0, &bcm47xx_fixed_phy_status, -1);
return 0;
}
device_initcall(bcm47xx_register_bus_complete);
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index b3679ad1c1c7..c8affad76f36 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -585,7 +585,7 @@ static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
.asym_pause = 0,
};
- phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
+ phydev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
if (!phydev || IS_ERR(phydev)) {
dev_err(kdev, "failed to register fixed PHY device\n");
return -ENODEV;
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 2f9457f05a2e..1bb70e3cc03e 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -22,6 +22,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/gpio.h>
#define MII_REGS_NUM 29
@@ -38,6 +39,7 @@ struct fixed_phy {
struct fixed_phy_status status;
int (*link_update)(struct net_device *, struct fixed_phy_status *);
struct list_head node;
+ int link_gpio;
};
static struct platform_device *pdev;
@@ -52,6 +54,9 @@ static int fixed_phy_update_regs(struct fixed_phy *fp)
u16 lpagb = 0;
u16 lpa = 0;
+ if (gpio_is_valid(fp->link_gpio))
+ fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
+
if (!fp->status.link)
goto done;
bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
@@ -215,7 +220,8 @@ int fixed_phy_update_state(struct phy_device *phydev,
EXPORT_SYMBOL(fixed_phy_update_state);
int fixed_phy_add(unsigned int irq, int phy_addr,
- struct fixed_phy_status *status)
+ struct fixed_phy_status *status,
+ int link_gpio)
{
int ret;
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -231,15 +237,26 @@ int fixed_phy_add(unsigned int irq, int phy_addr,
fp->addr = phy_addr;
fp->status = *status;
+ fp->link_gpio = link_gpio;
+
+ if (gpio_is_valid(fp->link_gpio)) {
+ ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
+ "fixed-link-gpio-link");
+ if (ret)
+ goto err_regs;
+ }
ret = fixed_phy_update_regs(fp);
if (ret)
- goto err_regs;
+ goto err_gpio;
list_add_tail(&fp->node, &fmb->phys);
return 0;
+err_gpio:
+ if (gpio_is_valid(fp->link_gpio))
+ gpio_free(fp->link_gpio);
err_regs:
kfree(fp);
return ret;
@@ -254,6 +271,8 @@ void fixed_phy_del(int phy_addr)
list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
if (fp->addr == phy_addr) {
list_del(&fp->node);
+ if (gpio_is_valid(fp->link_gpio))
+ gpio_free(fp->link_gpio);
kfree(fp);
return;
}
@@ -266,6 +285,7 @@ static DEFINE_SPINLOCK(phy_fixed_addr_lock);
struct phy_device *fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
+ int link_gpio,
struct device_node *np)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -282,7 +302,7 @@ struct phy_device *fixed_phy_register(unsigned int irq,
phy_addr = phy_fixed_addr++;
spin_unlock(&phy_fixed_addr_lock);
- ret = fixed_phy_add(PHY_POLL, phy_addr, status);
+ ret = fixed_phy_add(PHY_POLL, phy_addr, status, link_gpio);
if (ret < 0)
return ERR_PTR(ret);
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 7c8c23cc6896..1350fa25cdb0 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -16,6 +16,7 @@
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/module.h>
@@ -294,6 +295,7 @@ int of_phy_register_fixed_link(struct device_node *np)
struct fixed_phy_status status = {};
struct device_node *fixed_link_node;
const __be32 *fixed_link_prop;
+ int link_gpio;
int len, err;
struct phy_device *phy;
const char *managed;
@@ -302,7 +304,7 @@ int of_phy_register_fixed_link(struct device_node *np)
if (err == 0) {
if (strcmp(managed, "in-band-status") == 0) {
/* status is zeroed, namely its .link member */
- phy = fixed_phy_register(PHY_POLL, &status, np);
+ phy = fixed_phy_register(PHY_POLL, &status, -1, np);
return IS_ERR(phy) ? PTR_ERR(phy) : 0;
}
}
@@ -318,8 +320,13 @@ int of_phy_register_fixed_link(struct device_node *np)
status.pause = of_property_read_bool(fixed_link_node, "pause");
status.asym_pause = of_property_read_bool(fixed_link_node,
"asym-pause");
+ link_gpio = of_get_named_gpio_flags(fixed_link_node,
+ "link-gpios", 0, NULL);
of_node_put(fixed_link_node);
- phy = fixed_phy_register(PHY_POLL, &status, np);
+ if (link_gpio == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np);
return IS_ERR(phy) ? PTR_ERR(phy) : 0;
}
@@ -331,7 +338,7 @@ int of_phy_register_fixed_link(struct device_node *np)
status.speed = be32_to_cpu(fixed_link_prop[2]);
status.pause = be32_to_cpu(fixed_link_prop[3]);
status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
- phy = fixed_phy_register(PHY_POLL, &status, np);
+ phy = fixed_phy_register(PHY_POLL, &status, -1, np);
return IS_ERR(phy) ? PTR_ERR(phy) : 0;
}
diff --git a/include/linux/phy_fixed.h b/include/linux/phy_fixed.h
index fe5732d53eda..2400d2ea4f34 100644
--- a/include/linux/phy_fixed.h
+++ b/include/linux/phy_fixed.h
@@ -13,9 +13,11 @@ struct device_node;
#if IS_ENABLED(CONFIG_FIXED_PHY)
extern int fixed_phy_add(unsigned int irq, int phy_id,
- struct fixed_phy_status *status);
+ struct fixed_phy_status *status,
+ int link_gpio);
extern struct phy_device *fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
+ int link_gpio,
struct device_node *np);
extern void fixed_phy_del(int phy_addr);
extern int fixed_phy_set_link_update(struct phy_device *phydev,
@@ -26,12 +28,14 @@ extern int fixed_phy_update_state(struct phy_device *phydev,
const struct fixed_phy_status *changed);
#else
static inline int fixed_phy_add(unsigned int irq, int phy_id,
- struct fixed_phy_status *status)
+ struct fixed_phy_status *status,
+ int link_gpio)
{
return -ENODEV;
}
static inline struct phy_device *fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
+ int gpio_link,
struct device_node *np)
{
return ERR_PTR(-ENODEV);
--
2.5.0
--
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