From bb92ea5e352db0674dec77491ad44d81d7d9b2e2 Mon Sep 17 00:00:00 2001 From: Vivien Didelot Date: Fri, 23 Jan 2015 16:10:36 -0500 Subject: net: dsa/mv88e6xxx: add reg read and write debug This commit adds debug messages for the generic mv88e6xxx read and write routines. The output is similar to this: mdio-gpio mdio-gpio.0: <- addr: 0x1b reg: 0x05 val: 0x4000 mdio-gpio mdio-gpio.0: -> addr: 0x1b reg: 0x07 val: 0x3113 mdio-gpio mdio-gpio.0: -> addr: 0x1b reg: 0x08 val: 0x0330 mdio-gpio mdio-gpio.0: -> addr: 0x1b reg: 0x09 val: 0x0000 This is convenient to dynamically debug operations through debugfs with: echo file mv88e6xxx.c +p > /dynamic_debug/control Signed-off-by: Vivien Didelot Signed-off-by: David S. Miller --- drivers/net/dsa/mv88e6xxx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c index cd6807c6b4ed..3e7e31a6abb7 100644 --- a/drivers/net/dsa/mv88e6xxx.c +++ b/drivers/net/dsa/mv88e6xxx.c @@ -85,6 +85,12 @@ int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg) ret = __mv88e6xxx_reg_read(bus, ds->pd->sw_addr, addr, reg); mutex_unlock(&ps->smi_mutex); + if (ret < 0) + return ret; + + dev_dbg(ds->master_dev, "<- addr: 0x%.2x reg: 0x%.2x val: 0x%.4x\n", + addr, reg, ret); + return ret; } @@ -128,6 +134,9 @@ int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val) if (bus == NULL) return -EINVAL; + dev_dbg(ds->master_dev, "-> addr: 0x%.2x reg: 0x%.2x val: 0x%.4x\n", + addr, reg, val); + mutex_lock(&ps->smi_mutex); ret = __mv88e6xxx_reg_write(bus, ds->pd->sw_addr, addr, reg, val); mutex_unlock(&ps->smi_mutex); -- cgit v1.2.3