1 files changed, 101 insertions, 0 deletions
diff --git a/includes/dt_util.h b/includes/dt_util.h
new file mode 100644
index 00000000..bec9af1c
--- /dev/null
+++ b/includes/dt_util.h
@@ -0,0 +1,101 @@
+
+#ifndef _DT_UTIL_H_
+#define _DT_UTIL_H_
+
+#include <stdint.h>
+
+/* some not-quite-complete stuff that can be disabled */
+#define DTEX_PHREFS 1
+
+#ifndef DTR_ROOT
+#define DTR_ROOT dtr_find_device_tree_root()
+#endif
+
+enum {
+    DT_TYPE_ERR,
+
+    DT_NODE,
+    DTP_UNK,     /* arbitrary-length byte sequence */
+    DTP_EMPTY,   /* empty property */
+    DTP_STR,     /* null-delimited list of strings */
+    DTP_HEX,     /* list of 32-bit values displayed in hex */
+    DTP_UINT,    /* unsigned int list */
+    DTP_UINT64,  /* unsigned int64 list */
+    DTP_INTRUPT, /* interrupt-specifier list */
+    DTP_INTRUPT_EX, /* extended interrupt-specifier list */
+    DTP_OVR,     /* all in /__overrides__ */
+    DTP_PH,      /* phandle */
+    DTP_PH_REF,  /* reference to phandle */
+    DTP_REG,     /* <#address-cells, #size-cells> */
+    DTP_CLOCKS,  /* <phref, #clock-cells> */
+    DTP_GPIOS,   /* <phref, #gpio-cells> */
+    DTP_DMAS,    /* dma-specifier list */
+    DTP_OPP1,    /* list of operating points, pairs of (kHz,uV) */
+    DTP_PH_REF_OPP2,  /* phandle reference to opp-v2 table */
+};
+
+/* simplest, no aliases, doesn't require an existing dt.
+ * use dtr_get_prop_str() for complete. */
+char* dtr_get_string(const char *p, int decode);
+
+typedef uint32_t dt_uint; /* big-endian */
+typedef uint64_t dt_uint64; /* big-endian */
+
+typedef struct _dtr dtr;
+typedef struct _dtr_obj dtr_obj;
+
+dtr *dtr_new(const char *base_path); /* NULL for DTR_ROOT */
+void dtr_free(dtr *);
+int dtr_was_found(dtr *);
+const char *dtr_base_path(dtr *);
+char *dtr_messages(dtr *); /* returns a message log */
+
+dtr_obj *dtr_obj_read(dtr *, const char *dtp);
+void dtr_obj_free(dtr_obj *);
+int dtr_obj_type(dtr_obj *);
+char *dtr_obj_alias(dtr_obj *);
+char *dtr_obj_symbol(dtr_obj *);
+char *dtr_obj_path(dtr_obj *);        /* device tree path */
+char *dtr_obj_full_path(dtr_obj *);   /* system path */
+dtr_obj *dtr_get_parent_obj(dtr_obj *);
+
+/* find property/node 'name' relative to node
+ * if node is NULL, then from root */
+dtr_obj *dtr_get_prop_obj(dtr *, dtr_obj *node, const char *name);
+char *dtr_get_prop_str(dtr *, dtr_obj *node, const char *name);
+uint32_t dtr_get_prop_u32(dtr *, dtr_obj *node, const char *name);
+uint64_t dtr_get_prop_u64(dtr *, dtr_obj *node, const char *name);
+
+/* attempts to render the object as a string */
+char* dtr_str(dtr_obj *obj);
+
+int dtr_guess_type(dtr_obj *obj);
+char *dtr_elem_phref(dtr *, dt_uint e, int show_path, const char *extra);
+char *dtr_elem_hex(dt_uint e);
+char *dtr_elem_byte(uint8_t e);
+char *dtr_elem_uint(dt_uint e);
+char *dtr_list_byte(uint8_t *bytes, unsigned long count);
+char *dtr_list_hex(dt_uint *list, unsigned long count);
+
+int dtr_cellv_find(dtr_obj *obj, char *qprop, int limit);
+
+char *dtr_maps_info(dtr *); /* returns hardinfo shell section */
+
+const char *dtr_find_device_tree_root(void);
+
+/* write to the message log */
+void dtr_msg(dtr *s, char *fmt, ...);
+
+/* operating-points v0,v1,v2 */
+typedef struct {
+    uint32_t version; /* opp version, 0 = clock-frequency only */
+    uint32_t phandle; /* v2 only */
+    uint32_t khz_min;
+    uint32_t khz_max;
+    uint32_t clock_latency_ns;
+} dt_opp_range;
+
+/* free result with g_free() */
+dt_opp_range *dtr_get_opp_range(dtr *, const char *name);
+
+#endif