The device tree binding now allows a gpio to be specified which is
attached to the switch chips reset line. If it is defined, perform
a hardware reset on the switch during setup.
Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
drivers/net/dsa/mv88e6xxx.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index b06dba05594a..c0bbbe7713c5 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -19,6 +19,7 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
+#include <linux/gpio/consumer.h>
#include <linux/phy.h>
#include <net/dsa.h>
#include <net/switchdev.h>
@@ -2323,7 +2324,10 @@ int mv88e6xxx_switch_reset(struct dsa_switch *ds, bool
ppu_active)
{
struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
u16 is_reset = (ppu_active ? 0x8800 : 0xc800);
+ int gpio = ds->pd->reset;
+ int flags = ds->pd->reset_flags;
unsigned long timeout;
+ int on = 1;
int ret;
int i;
@@ -2336,6 +2340,16 @@ int mv88e6xxx_switch_reset(struct dsa_switch *ds, bool
ppu_active)
/* Wait for transmit queues to drain. */
usleep_range(2000, 4000);
+ /* If there is a gpio connected to the reset pin, toggle it */
+ if (gpio_is_valid(gpio)) {
+ if (flags && OF_GPIO_ACTIVE_LOW)
+ on = !on;
+ gpio_set_value_cansleep(gpio, on);
+ usleep_range(10000, 20000);
+ gpio_set_value_cansleep(gpio, !on);
+ usleep_range(10000, 20000);
+ }
+
/* Reset the switch. Keep the PPU active if requested. The PPU
* needs to be active to support indirect phy register access
* through global registers 0x18 and 0x19.
--
2.6.2
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