clk: mxs: add clkdev lookup for pwm

Add pwm clock lookup for imx23 and imx28 booting from device tree.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

drivers/clk/mxs/clk-imx23.c

@@ -189,6 +189,7 @@ int __init mx23_clocks_init(void)
 		}
 
 	clk_register_clkdev(clks[clk32k], NULL, "timrot");
+	clk_register_clkdev(clks[pwm], NULL, "80064000.pwm");
 	clk_register_clkdevs(clks[hbus], hbus_lookups, ARRAY_SIZE(hbus_lookups));
 	clk_register_clkdevs(clks[xbus], xbus_lookups, ARRAY_SIZE(xbus_lookups));
 	clk_register_clkdevs(clks[uart], uart_lookups, ARRAY_SIZE(uart_lookups));

drivers/clk/mxs/clk-imx28.c

@@ -314,6 +314,7 @@ int __init mx28_clocks_init(void)
 
 	clk_register_clkdev(clks[clk32k], NULL, "timrot");
 	clk_register_clkdev(clks[enet_out], NULL, "enet_out");
+	clk_register_clkdev(clks[pwm], NULL, "80064000.pwm");
 	clk_register_clkdevs(clks[hbus], hbus_lookups, ARRAY_SIZE(hbus_lookups));
 	clk_register_clkdevs(clks[xbus], xbus_lookups, ARRAY_SIZE(xbus_lookups));
 	clk_register_clkdevs(clks[uart], uart_lookups, ARRAY_SIZE(uart_lookups));