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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2010-10-07 17:19:10 +0900 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2010-10-08 13:50:18 +0900 |
| commit | 7cf4b482f06df0b590a9bc1561a5a81d67e0fe4c (patch) | |
| tree | 694533686d5343b47e5bc0c4658080fcfbcc2a1c /arch | |
| parent | 4341f9b38fe33aab51439ae59593e149a6f61d9f (diff) | |
| download | linux-7cf4b482f06df0b590a9bc1561a5a81d67e0fe4c.tar.gz linux-7cf4b482f06df0b590a9bc1561a5a81d67e0fe4c.tar.bz2 linux-7cf4b482f06df0b590a9bc1561a5a81d67e0fe4c.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-samsung/clock.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/arch/arm/plat-samsung/clock.c b/arch/arm/plat-samsung/clock.c index 90a20512d68d..e8d20b0bc50e 100644 --- a/arch/arm/plat-samsung/clock.c +++ b/arch/arm/plat-samsung/clock.c @@ -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; |