ARM: pxa: add rtc dummy clock

sa1100-rtc driver could be shared among sa1100/pxa/mmp series silicon.
Since clk is used in mmp series silicon, add dummy clock support in
pxa also.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>

arch/arm/mach-pxa/pxa25x.c

@@ -209,6 +209,7 @@ static struct clk_lookup pxa25x_clkregs[] = {
 	INIT_CLKREG(&clk_pxa25x_gpio11, NULL, "GPIO11_CLK"),
 	INIT_CLKREG(&clk_pxa25x_gpio12, NULL, "GPIO12_CLK"),
 	INIT_CLKREG(&clk_pxa25x_mem, "pxa2xx-pcmcia", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 };
 
 static struct clk_lookup pxa25x_hwuart_clkreg =

arch/arm/mach-pxa/pxa27x.c

@@ -230,6 +230,7 @@ static struct clk_lookup pxa27x_clkregs[] = {
 	INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
 	INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
 	INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 };
 
 #ifdef CONFIG_PM

arch/arm/mach-pxa/pxa3xx.c

@@ -89,6 +89,7 @@ static struct clk_lookup pxa3xx_clkregs[] = {
 	INIT_CLKREG(&clk_pxa3xx_mmc2, "pxa2xx-mci.1", NULL),
 	INIT_CLKREG(&clk_pxa3xx_smemc, "pxa2xx-pcmcia", NULL),
 	INIT_CLKREG(&clk_pxa3xx_gpio, "pxa-gpio", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 };
 
 #ifdef CONFIG_PM

arch/arm/mach-pxa/pxa95x.c

@@ -231,6 +231,7 @@ static struct clk_lookup pxa95x_clkregs[] = {
 	INIT_CLKREG(&clk_pxa95x_pwm0, "pxa27x-pwm.0", NULL),
 	INIT_CLKREG(&clk_pxa95x_pwm1, "pxa27x-pwm.1", NULL),
 	INIT_CLKREG(&clk_pxa95x_gpio, "pxa-gpio", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 };
 
 void __init pxa95x_init_irq(void)