From: Sam Ravnborg <sam@ravnborg.org>
To: Barebox List <barebox@lists.infradead.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Subject: [PATCH v2 2/3] phylib: add support for reset-gpios
Date: Wed, 8 Aug 2018 21:17:00 +0200 [thread overview]
Message-ID: <20180808191701.27586-2-sam@ravnborg.org> (raw)
In-Reply-To: <20180808191505.GA27531@ravnborg.org>
Add minimal support for reset-gpios.
Example DT that uses this:
mdio {
#address-cells = <1>;
#size-cells = <0>;
reset-gpios = <&pioE 17 GPIO_ACTIVE_LOW>;
reset-delay-us = <1000>;
ethphy0: ethernet-phy@1 {
reg = <3>;
};
};
This was required to get the Davicom PHY operational on
my proprietary board.
I added the minimal mdio_reset() calls.
Another options was to use a bus reset, but then
the net/ driver used should have dedicated reset support.
The reset-gpios solution is general and matches the
binding specification in net/mdio.txt
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
drivers/net/phy/mdio_bus.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
include/linux/phy.h | 5 ++++
2 files changed, 67 insertions(+), 2 deletions(-)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index d209716a1..ad358192d 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -17,6 +17,8 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <common.h>
+#include <of_gpio.h>
+#include <gpio.h>
#include <driver.h>
#include <init.h>
#include <clock.h>
@@ -25,6 +27,8 @@
#include <linux/phy.h>
#include <linux/err.h>
+#define DEFAULT_GPIO_RESET_DELAY 10 /* us */
+
LIST_HEAD(mii_bus_list);
int mdiobus_detect(struct device_d *dev)
@@ -83,6 +87,45 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
}
/**
+ * of_mdioibus_register_reset - register optional reset-gpios
+ * @mdio: pointer to mii_bus structure
+ * @np: pointer to device_node of MDIO bus.
+ *
+ * Read optional reset-gpios from mido node in DT
+ */
+static void of_mdiobus_register_reset(struct mii_bus *mdio,
+ struct device_node *np)
+{
+ enum of_gpio_flags of_flags;
+ u32 reset_delay;
+ int gpio;
+
+ if (!np)
+ return;
+
+ reset_delay = DEFAULT_GPIO_RESET_DELAY;
+ of_property_read_u32(np, "reset-delay-us", &reset_delay);
+
+ gpio = of_get_named_gpio_flags(np, "reset-gpios", 0, &of_flags);
+ if (gpio_is_valid(gpio)) {
+ unsigned long flags;
+ char *name;
+
+ name = basprintf("%s-reset", dev_name(&mdio->dev));
+ flags = GPIOF_OUT_INIT_INACTIVE;
+
+ if (of_flags & OF_GPIO_ACTIVE_LOW)
+ flags |= GPIOF_ACTIVE_LOW;
+
+ if (gpio_request_one(gpio, flags, name) >= 0) {
+ mdio->reset_gpio = gpio;
+ mdio->reset_delay = reset_delay;
+ }
+ }
+
+}
+
+/**
* of_mdiobus_register - Register mii_bus and create PHYs from the device tree
* @mdio: pointer to mii_bus structure
* @np: pointer to device_node of MDIO bus.
@@ -96,6 +139,9 @@ static int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
u32 addr;
int ret;
+ if (!np)
+ return -ENODEV;
+
/* Loop over the child nodes and register a phy_device for each one */
for_each_available_child_of_node(np, child) {
ret = of_property_read_u32(child, "reg", &addr);
@@ -128,6 +174,7 @@ static int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
*/
int mdiobus_register(struct mii_bus *bus)
{
+ struct device_node *np;
int err;
if (NULL == bus ||
@@ -147,6 +194,11 @@ int mdiobus_register(struct mii_bus *bus)
return -EINVAL;
}
+ np = bus->dev.device_node;
+
+ of_mdiobus_register_reset(bus, np);
+
+ mdio_reset(bus);
if (bus->reset)
bus->reset(bus);
@@ -154,8 +206,7 @@ int mdiobus_register(struct mii_bus *bus)
pr_info("%s: probed\n", dev_name(&bus->dev));
- if (bus->dev.device_node)
- of_mdiobus_register(bus, bus->dev.device_node);
+ of_mdiobus_register(bus, np);
return 0;
}
@@ -190,6 +241,15 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
}
EXPORT_SYMBOL(mdiobus_scan);
+void mdio_reset(const struct mii_bus *bus)
+{
+ if (gpio_is_valid(bus->reset_gpio)) {
+ gpio_set_active(bus->reset_gpio, 1);
+ udelay(bus->reset_delay);
+ gpio_set_active(bus->reset_gpio, 0);
+ }
+}
+EXPORT_SYMBOL(mdio_reset);
/**
*
diff --git a/include/linux/phy.h b/include/linux/phy.h
index ac750f5c3..a34f5b20f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -99,6 +99,10 @@ struct mii_bus {
/* PHY addresses to be ignored when probing */
u32 phy_mask;
+ /* Optional reset of all PHY's on the bus */
+ int reset_gpio;
+ int reset_delay;
+
struct list_head list;
bool is_multiplexed;
@@ -108,6 +112,7 @@ struct mii_bus {
int mdiobus_register(struct mii_bus *bus);
void mdiobus_unregister(struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
+void mdio_reset(const struct mii_bus *bus);
extern struct list_head mii_bus_list;
--
2.12.0
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next prev parent reply other threads:[~2018-08-08 19:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-08 19:15 [PATCH v2 0/3] Add Davicom phy + reset-gpios Sam Ravnborg
2018-08-08 19:16 ` [PATCH v2 1/3] phylib: add Davicom PHY support Sam Ravnborg
2018-08-08 19:17 ` Sam Ravnborg [this message]
2018-08-10 6:40 ` [PATCH v2 2/3] phylib: add support for reset-gpios Sascha Hauer
2018-08-10 7:43 ` Sam Ravnborg
2018-08-08 19:17 ` [PATCH v2 3/3] at91sam9263ek: add PHY, miitool etc. to config Sam Ravnborg
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