Add kernel patch to expose omap3 die id via sysfs

SVN-Revision: 25112

target/linux/omap35xx/patches-2.6.36/001-expose_omap3_die_id.patch

@@ -0,0 +1,48 @@
+diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
+index 9a879f9..9cefef4 100644
+--- a/arch/arm/mach-omap2/id.c
++++ b/arch/arm/mach-omap2/id.c
+@@ -85,6 +85,9 @@ EXPORT_SYMBOL(omap_type);
+ 
+ #define read_tap_reg(reg)	__raw_readl(tap_base  + (reg))
+ 
++static ssize_t die_id_show(struct kobject *, struct kobj_attribute *, char *);
++static struct kobj_attribute die_id_attr = __ATTR(die_id, 0444, die_id_show, NULL);
++
+ struct omap_id {
+ 	u16	hawkeye;	/* Silicon type (Hawkeye id) */
+ 	u8	dev;		/* Device type from production_id reg */
+@@ -104,6 +107,17 @@ static struct omap_id omap_ids[] __initdata = {
+ static void __iomem *tap_base;
+ static u16 tap_prod_id;
+ 
++static ssize_t die_id_show(struct kobject *kobj, struct kobj_attribute *attr,
++				char *buf)
++{
++	return sprintf(buf, "Die ID: %08x%08x%08x%08x\n",
++			read_tap_reg(OMAP_TAP_DIE_ID_0),
++			read_tap_reg(OMAP_TAP_DIE_ID_1),
++			read_tap_reg(OMAP_TAP_DIE_ID_2),
++			read_tap_reg(OMAP_TAP_DIE_ID_3));
++
++}
++
+ void omap_get_die_id(struct omap_die_id *odi)
+ {
+ 	odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_0);
+@@ -457,3 +471,15 @@ void __init omap2_set_globals_tap(struct omap_globals *omap2_globals)
+ 	else
+ 		tap_prod_id = 0x0208;
+ }
++
++int __init export_omap_die_id(void)
++{
++	int error;
++
++	error = sysfs_create_file(power_kobj, &die_id_attr.attr);
++	if (error)
++		printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
++	return error;
++}
++
++late_initcall(export_omap_die_id);