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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-06-30 19:47:59 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-07-09 20:54:14 +0100
commitbdb08cb2d3491d441dd403dfb88d90ba90fb7232 (patch)
tree390117716c0f4f30a50636a5a0ef1e828e48d1fa
parent5e329d1c7f5fe6adfee99c783fa98bda7dae8ac5 (diff)
[ARM] pxa: allow clk aliases
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>
-rw-r--r--arch/arm/mach-pxa/clock.c3
-rw-r--r--arch/arm/mach-pxa/clock.h12
-rw-r--r--arch/arm/mach-pxa/pxa25x.c8
3 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/clock.c b/arch/arm/mach-pxa/clock.c
index e97dc59813c..68afc396b4a 100644
--- a/arch/arm/mach-pxa/clock.c
+++ b/arch/arm/mach-pxa/clock.c
@@ -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);
diff --git a/arch/arm/mach-pxa/clock.h b/arch/arm/mach-pxa/clock.h
index bc6b77e1592..83cbfaba485 100644
--- a/arch/arm/mach-pxa/clock.h
+++ b/arch/arm/mach-pxa/clock.h
@@ -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);
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index e5b417d14bb..09ee131d24a 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -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;
}