From 90aabaafa55a7a3d48bf27db160b8f058298015d Mon Sep 17 00:00:00 2001
From: Emmanuel Vadot <manu@FreeBSD.org>
Date: Fri, 4 Nov 2016 17:04:45 +0000
Subject: [PATCH] Add clk_set_assigned

assigned-clock-parents are DT properties used to configure
some default parent clocks on one node.

Reviewed by:	mmel
MFC after:	2 weeks
---
 sys/dev/extres/clk/clk.c | 50 ++++++++++++++++++++++++++++++++++++++--
 sys/dev/extres/clk/clk.h |  2 ++
 2 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/sys/dev/extres/clk/clk.c b/sys/dev/extres/clk/clk.c
index bcb0a263027..9c189fa8669 100644
--- a/sys/dev/extres/clk/clk.c
+++ b/sys/dev/extres/clk/clk.c
@@ -1196,7 +1196,47 @@ clk_get_by_id(device_t dev, struct clkdom *clkdom, intptr_t id, clk_t *clk)
 #ifdef FDT
 
 int
-clk_get_by_ofw_index(device_t dev, phandle_t cnode, int idx, clk_t *clk)
+clk_set_assigned(device_t dev, phandle_t node)
+{
+	clk_t clk, clk_parent;
+	int error, nclocks, i;
+
+	error = ofw_bus_parse_xref_list_get_length(node,
+	    "assigned-clock-parents", "#clock-cells", &nclocks);
+
+	if (error != 0) {
+		device_printf(dev, "cannot parse assigned-clock-parents property\n");
+		return (error);
+	}
+
+	for (i = 0; i < nclocks; i++) {
+		error = clk_get_by_ofw_index_prop(dev, 0,
+		    "assigned-clock-parents", i, &clk_parent);
+		if (error != 0) {
+			device_printf(dev, "cannot get parent %d\n", i);
+			return (error);
+		}
+
+		error = clk_get_by_ofw_index_prop(dev, 0, "assigned-clocks",
+		    i, &clk);
+		if (error != 0) {
+			device_printf(dev, "cannot get assigned clock %d\n", i);
+			clk_release(clk_parent);
+			return (error);
+		}
+
+		error = clk_set_parent_by_clk(clk, clk_parent);
+		clk_release(clk_parent);
+		clk_release(clk);
+		if (error != 0)
+			return (error);
+	}
+
+	return (0);
+}
+
+int
+clk_get_by_ofw_index_prop(device_t dev, phandle_t cnode, const char *prop, int idx, clk_t *clk)
 {
 	phandle_t parent, *cells;
 	device_t clockdev;
@@ -1214,7 +1254,7 @@ clk_get_by_ofw_index(device_t dev, phandle_t cnode, int idx, clk_t *clk)
 	}
 
 
-	rv = ofw_bus_parse_xref_list_alloc(cnode, "clocks", "#clock-cells", idx,
+	rv = ofw_bus_parse_xref_list_alloc(cnode, prop, "#clock-cells", idx,
 	    &parent, &ncells, &cells);
 	if (rv != 0) {
 		return (rv);
@@ -1246,6 +1286,12 @@ done:
 	return (rv);
 }
 
+int
+clk_get_by_ofw_index(device_t dev, phandle_t cnode, int idx, clk_t *clk)
+{
+	return (clk_get_by_ofw_index_prop(dev, cnode, "clocks", idx, clk));
+}
+
 int
 clk_get_by_ofw_name(device_t dev, phandle_t cnode, const char *name, clk_t *clk)
 {
diff --git a/sys/dev/extres/clk/clk.h b/sys/dev/extres/clk/clk.h
index 60b8d2b77b7..9bd25999797 100644
--- a/sys/dev/extres/clk/clk.h
+++ b/sys/dev/extres/clk/clk.h
@@ -129,7 +129,9 @@ int clk_set_parent_by_clk(clk_t clk, clk_t parent);
 const char *clk_get_name(clk_t clk);
 
 #ifdef FDT
+int clk_set_assigned(device_t dev, phandle_t node);
 int clk_get_by_ofw_index(device_t dev, phandle_t node, int idx, clk_t *clk);
+int clk_get_by_ofw_index_prop(device_t dev, phandle_t cnode, const char *prop, int idx, clk_t *clk);
 int clk_get_by_ofw_name(device_t dev, phandle_t node, const char *name,
      clk_t *clk);
 int clk_parse_ofw_out_names(device_t dev, phandle_t node,