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ARM: SAMSUNG: Add a workaround for get_clock() for serial driver 

Serial drivers call get_clock() very early, before platform bus
has been set up, this requires a special check to let them get
a proper clock. Without this patch, a serial console is broken
on S5PV310 and S5PC210 boards.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[kgene.kim@samsung.com: fix coding-style]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
hifive-unleashed-5.1
Marek Szyprowski 2010-10-07 17:19:10 +09:00 committed by Kukjin Kim
parent 4341f9b38f
commit 7cf4b482f0
1 changed files with 26 additions and 1 deletions
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27
arch/arm/plat-samsung/clock.c
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@ -48,6 +48,9 @@
#include <plat/clock.h>
#include <plat/cpu.h>
#include <linux/serial_core.h>
#include <plat/regs-serial.h> /* for s3c24xx_uart_devs */
/* clock information */
static LIST_HEAD(clocks);
@ -65,6 +68,28 @@ static int clk_null_enable(struct clk *clk, int enable)
return 0;
}
static int dev_is_s3c_uart(struct device *dev)
{
struct platform_device **pdev = s3c24xx_uart_devs;
int i;
for (i = 0; i < ARRAY_SIZE(s3c24xx_uart_devs); i++, pdev++)
if (*pdev && dev == &(*pdev)->dev)
return 1;
return 0;
}
/*
* Serial drivers call get_clock() very early, before platform bus
* has been set up, this requires a special check to let them get
* a proper clock
*/
static int dev_is_platform_device(struct device *dev)
{
return dev->bus == &platform_bus_type ||
(dev->bus == NULL && dev_is_s3c_uart(dev));
}
/* Clock API calls */
struct clk *clk_get(struct device *dev, const char *id)
@ -73,7 +98,7 @@ struct clk *clk_get(struct device *dev, const char *id)
struct clk *clk = ERR_PTR(-ENOENT);
int idno;
if (dev == NULL || dev->bus != &platform_bus_type)
if (dev == NULL || !dev_is_platform_device(dev))
idno = -1;
else
idno = to_platform_device(dev)->id;