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[ARM] pxa: allow clk aliases

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We need to support more than one name+device for a struct clk for a
small number of peripherals.  We do this by re-using struct clk alias
to another struct clk - IOW, if we find that the entry we're using is
an alias, we return the aliased entry not the one we found.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2008-06-30 19:47:59 +01:00 committed by Russell King
parent 5e329d1c7f
commit bdb08cb2d3
3 changed files with 23 additions and 0 deletions
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3
arch/arm/mach-pxa/clock.c
View File

@ -47,6 +47,9 @@ struct clk *clk_get(struct device *dev, const char *id)
clk = p;
mutex_unlock(&clocks_mutex);
if (!IS_ERR(clk) && clk->ops == NULL)
clk = clk->other;
return clk;
}
EXPORT_SYMBOL(clk_get);

12
arch/arm/mach-pxa/clock.h
View File

@ -15,6 +15,7 @@ struct clk {
unsigned int cken;
unsigned int delay;
unsigned int enabled;
struct clk *other;
};
#define INIT_CKEN(_name, _cken, _rate, _delay, _dev) \
@ -35,6 +36,17 @@ struct clk {
.cken = CKEN_##_cken, \
}
/*
* This is a placeholder to alias one clock device+name pair
* to another struct clk.
*/
#define INIT_CKOTHER(_name, _other, _dev) \
{ \
.name = _name, \
.dev = _dev, \
.other = _other, \
}
extern const struct clkops clk_cken_ops;
void clk_cken_enable(struct clk *clk);

8
arch/arm/mach-pxa/pxa25x.c
View File

@ -117,6 +117,10 @@ static struct clk pxa25x_hwuart_clk =
INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev)
;
/*
* PXA 2xx clock declarations. Order is important (see aliases below)
* Please be careful not to disrupt the ordering.
*/
static struct clk pxa25x_clks[] = {
INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
@ -140,6 +144,8 @@ static struct clk pxa25x_clks[] = {
INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
};
static struct clk gpio7_clk = INIT_CKOTHER("GPIO7_CK", &pxa25x_clks[4], NULL);
#ifdef CONFIG_PM
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
@ -311,6 +317,8 @@ static int __init pxa25x_init(void)
if (cpu_is_pxa25x())
ret = platform_device_register(&pxa_device_hwuart);
clks_register(&gpio7_clk, 1);
return ret;
}