Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c8c1b39a authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller
Browse files

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: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cc30c163

drivers/net/dsa/mv88e6xxx.c

+10 −0
Original line number Diff line number Diff line
@@ -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.