mac80211/rt2x00: allow disabling bands through dts

Add dts property ralink,2ghz and ralink,5ghz
e.g. disable 2ghz band:
wmac@10180000 {
  status = "okay";
  ralink,2ghz = <0>;
}

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

SVN-Revision: 42281

package/kernel/mac80211/patches/609-rt2x00-allow_disabling_bands_through_dts.patch

@@ -0,0 +1,27 @@
+--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
++++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
+@@ -26,6 +26,7 @@
+ #include <linux/module.h>
+ #include <linux/slab.h>
+ #include <linux/log2.h>
++#include <linux/of.h>
+ 
+ #include "rt2x00.h"
+ #include "rt2x00lib.h"
+@@ -951,6 +952,16 @@ static int rt2x00lib_probe_hw_modes(stru
+ 	struct ieee80211_rate *rates;
+ 	unsigned int num_rates;
+ 	unsigned int i;
++#ifdef CONFIG_OF
++	struct device_node *np = rt2x00dev->dev->of_node;
++	unsigned int enabled;
++	if (!of_property_read_u32(np, "ralink,2ghz",
++                                          &enabled) && !enabled)
++		spec->supported_bands &= ~SUPPORT_BAND_2GHZ;
++	if (!of_property_read_u32(np, "ralink,5ghz",
++                                          &enabled) && !enabled)
++		spec->supported_bands &= ~SUPPORT_BAND_5GHZ;
++#endif /* CONFIG_OF */
+ 
+ 	if (rt2x00dev->dev->platform_data) {
+ 		struct rt2x00_platform_data *pdata;