[PATCH v2] [POWERPC] Enable correct operation of serial ports with nonzero regshift.

[Pavel Kiryukhin]

Add regshift reading to serial drivers.
This enables correct operation of serial ports with 
nonzero regshift such as Xilinx opb 16550 uart.

Signed-off-by: Pavel Kiryukhin <[EMAIL PROTECTED]>

 arch/powerpc/kernel/legacy_serial.c |    6 +++++-
 drivers/serial/of_serial.c          |    6 ++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/legacy_serial.c 
b/arch/powerpc/kernel/legacy_serial.c
index 61dd174..949e41c 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -50,7 +50,7 @@ static int __init add_legacy_port(struct device_node *np, int 
want_index,
                                  phys_addr_t taddr, unsigned long irq,
                                  upf_t flags, int irq_check_parent)
 {
-       const u32 *clk, *spd;
+       const u32 *clk, *spd, *regshift;
        u32 clock = BASE_BAUD * 16;
        int index;
 
@@ -62,6 +62,9 @@ static int __init add_legacy_port(struct device_node *np, int 
want_index,
        /* get default speed if present */
        spd = of_get_property(np, "current-speed", NULL);
 
+       /* get regshift if present*/
+       regshift = of_get_property(np, "reg-shift", NULL);
+
        /* If we have a location index, then try to use it */
        if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
                index = want_index;
@@ -104,6 +107,7 @@ static int __init add_legacy_port(struct device_node *np, 
int want_index,
        legacy_serial_ports[index].uartclk = clock;
        legacy_serial_ports[index].irq = irq;
        legacy_serial_ports[index].flags = flags;
+       legacy_serial_ports[index].regshift = regshift ? (u8)*regshift : 0;
        legacy_serial_infos[index].taddr = taddr;
        legacy_serial_infos[index].np = of_node_get(np);
        legacy_serial_infos[index].clock = clock;
diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c
index a64d858..3f09c5a 100644
--- a/drivers/serial/of_serial.c
+++ b/drivers/serial/of_serial.c
@@ -30,7 +30,7 @@ static int __devinit of_platform_serial_setup(struct 
of_device *ofdev,
 {
        struct resource resource;
        struct device_node *np = ofdev->node;
-       const unsigned int *clk, *spd;
+       const unsigned int *clk, *spd, *regshift;
        int ret;
 
        memset(port, 0, sizeof *port);
@@ -40,7 +40,7 @@ static int __devinit of_platform_serial_setup(struct 
of_device *ofdev,
                dev_warn(&ofdev->dev, "no clock-frequency property set\n");
                return -ENODEV;
        }
-
+       regshift = of_get_property(np, "reg-shift", NULL);
        ret = of_address_to_resource(np, 0, &resource);
        if (ret) {
                dev_warn(&ofdev->dev, "invalid address\n");
@@ -57,6 +57,8 @@ static int __devinit of_platform_serial_setup(struct 
of_device *ofdev,
                | UPF_FIXED_PORT;
        port->dev = &ofdev->dev;
        port->custom_divisor = *clk / (16 * (*spd));
+       if (regshift)
+               port->regshift = *regshift;
 
        return 0;
 }
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