netdev - [PATCH v2 net-next v2 2/4] net: dsa: mv88e6xxx: add helper to hardware reset

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Message-Id: <20161205162703.22567-3-vivien.didelot@savoirfairelinux.com>
Date:   Mon,  5 Dec 2016 11:27:01 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Stefan Eichenberger <eichest@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: [PATCH v2 net-next v2 2/4] net: dsa: mv88e6xxx: add helper to hardware reset

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

Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 1d4d3be..27dfb5d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -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
-- 
2.10.2