ARM: dts: omap3-beagle-xm: Add fixed 26MHz clock as fck for twl

The board uses 26MHz oscillator for the twl4030 HFCLK.
This way we will not depend on the bootloader to configure the
CFG_BOOT:HFCLK_FREQ
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-beagle-xm.dts

@@ -30,6 +30,13 @@ aliases {
 		ethernet = &ethernet;
 	};
 
+	/* fixed 26MHz oscillator */
+	hfclk_26m: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <26000000>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -274,6 +281,9 @@ twl: twl@48 {
 		interrupts = <7>; /* SYS_NIRQ cascaded to intc */
 		interrupt-parent = <&intc>;
 
+		clocks = <&hfclk_26m>;
+		clock-names = "fck";
+
 		twl_audio: audio {
 			compatible = "ti,twl4030-audio";
 			codec {