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net: dsa: mv88e6xxx: add helper to hardware reset

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Add an helper to toggle the eventual GPIO connected to the reset pin.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2016-12-05 17:30:26 -05:00 committed by David S. Miller
parent 4ac4b5a623
commit 309eca6db9
1 changed files with 14 additions and 8 deletions
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22
drivers/net/dsa/mv88e6xxx/chip.c
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@ -2356,6 +2356,19 @@ static void mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port)
mutex_unlock(&chip->reg_lock);
}
static void mv88e6xxx_hardware_reset(struct mv88e6xxx_chip *chip)
{
struct gpio_desc *gpiod = chip->reset;
/* 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);
}
}
static int mv88e6xxx_disable_ports(struct mv88e6xxx_chip *chip)
{
int i, err;
@ -2380,7 +2393,6 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)
{
bool ppu_active = mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU_ACTIVE);
u16 is_reset = (ppu_active ? 0x8800 : 0xc800);
struct gpio_desc *gpiod = chip->reset;
unsigned long timeout;
u16 reg;
int err;
@ -2389,13 +2401,7 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)
if (err)
return err;
/* 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);
}
mv88e6xxx_hardware_reset(chip);
/* Reset the switch. Keep the PPU active if requested. The PPU
* needs to be active to support indirect phy register access