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[ARM] 4777/1: S3C24XX: Ensure clk_set_rate() checks the set_rate method for the clk

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Add checks for clk_set_rate() and ensure that we do not allow set_rate
to be called for a clock that does not have it defined. Add default
methods for fclk, hclk, pclk and mpll.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ben Dooks 2008-01-28 13:01:17 +01:00 committed by Russell King
parent f7275dac55
commit 57c1b0f8db
1 changed files with 19 additions and 0 deletions
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19
arch/arm/plat-s3c24xx/clock.c
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@ -172,6 +172,15 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
if (IS_ERR(clk))
return -EINVAL;
/* We do not default just do a clk->rate = rate as
* the clock may have been made this way by choice.
*/
WARN_ON(clk->set_rate == NULL);
if (clk->set_rate == NULL)
return -EINVAL;
mutex_lock(&clocks_mutex);
ret = (clk->set_rate)(clk, rate);
mutex_unlock(&clocks_mutex);
@ -213,6 +222,12 @@ EXPORT_SYMBOL(clk_set_parent);
/* base clocks */
static int clk_default_setrate(struct clk *clk, unsigned long rate)
{
clk->rate = rate;
return 0;
}
struct clk clk_xtal = {
.name = "xtal",
.id = -1,
@ -224,6 +239,7 @@ struct clk clk_xtal = {
struct clk clk_mpll = {
.name = "mpll",
.id = -1,
.set_rate = clk_default_setrate,
};
struct clk clk_upll = {
@ -239,6 +255,7 @@ struct clk clk_f = {
.rate = 0,
.parent = &clk_mpll,
.ctrlbit = 0,
.set_rate = clk_default_setrate,
};
struct clk clk_h = {
@ -247,6 +264,7 @@ struct clk clk_h = {
.rate = 0,
.parent = NULL,
.ctrlbit = 0,
.set_rate = clk_default_setrate,
};
struct clk clk_p = {
@ -255,6 +273,7 @@ struct clk clk_p = {
.rate = 0,
.parent = NULL,
.ctrlbit = 0,
.set_rate = clk_default_setrate,
};
struct clk clk_usb_bus = {