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dsa: mv88e6xxx.c: Hardware reset the chip if available 

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 <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2015-11-20 03:56:24 +01:00 committed by David S. Miller
parent cc30c16344
commit c8c1b39a86
1 changed files with 10 additions and 0 deletions
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10
drivers/net/dsa/mv88e6xxx.c
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@ -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>
@ -2323,6 +2324,7 @@ 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);
struct gpio_desc *gpiod = ds->pd->reset;
unsigned long timeout;
int ret;
int i;
@ -2336,6 +2338,14 @@ 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 (gpiod) {
gpiod_set_value_cansleep(gpiod, 1);
usleep_range(10000, 20000);
gpiod_set_value_cansleep(gpiod, 0);
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.