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serial: pxa: fine-tune clk useage 

1) add clk_enable/disable in serial_pxa_console_write()
2) add clk_prepare() to follow common clock driver

Signed-off-by: Yi Zhang <yizhang@marvell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yi Zhang 2013-01-23 09:52:25 +08:00 committed by Greg Kroah-Hartman
parent e8c5b56fdc
commit 9429ccbf38
1 changed files with 11 additions and 1 deletions
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12
drivers/tty/serial/pxa.c
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@ -672,7 +672,7 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
unsigned long flags;
int locked = 1;
clk_enable(up->clk);
local_irq_save(flags);
if (up->port.sysrq)
locked = 0;
@ -699,6 +699,7 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
clk_disable(up->clk);
}
@ -896,6 +897,12 @@ static int serial_pxa_probe(struct platform_device *dev)
goto err_free;
}
ret = clk_prepare(sport->clk);
if (ret) {
clk_put(sport->clk);
goto err_free;
}
sport->port.type = PORT_PXA;
sport->port.iotype = UPIO_MEM;
sport->port.mapbase = mmres->start;
@ -927,6 +934,7 @@ static int serial_pxa_probe(struct platform_device *dev)
return 0;
err_clk:
clk_unprepare(sport->clk);
clk_put(sport->clk);
err_free:
kfree(sport);
@ -940,6 +948,8 @@ static int serial_pxa_remove(struct platform_device *dev)
platform_set_drvdata(dev, NULL);
uart_remove_one_port(&serial_pxa_reg, &sport->port);
clk_unprepare(sport->clk);
clk_put(sport->clk);
kfree(sport);