[PATCH] drivers: clk: Update clock driver to handle clock attribute

[Jolly Shah]

From: Rajan Vaja <rajan.vaja@xxxxxxxxxx>

Versal EEMI APIs uses clock device ID which is combination of class,
subclass, type and clock index (e.g. 0x8104006 in which 0-13 bits are
for index(6 in given example), 14-19 bits are for clock type (i.e pll,
out or ref, 1 in given example), 20-25 bits are for subclass which is
nothing but clock type only), 26-32 bits are for device class, which
is clock(0x2) for all clocks) while zynqmp firmware uses clock ID
which is index only (e.g 0, 1, to n, where n is max_clock id).

To use zynqmp clock driver for versal platform also, extend use
of QueryAttribute API to fetch device class, subclass and clock type
to create clock device ID. In case of zynqmp this attributes would be
0 only, so there won't be any effect on clock id as it would use
clock index only.

Signed-off-by: Tejas Patel <tejas.patel@xxxxxxxxxx>
Signed-off-by: Rajan Vaja <rajan.vaja@xxxxxxxxxx>
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
Signed-off-by: Jolly Shah <jollys@xxxxxxxxxx>
---
 drivers/clk/zynqmp/clkc.c | 42 +++++++++++++++++++++++++++++-------------
 1 file changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
index f65cc0f..c13b014 100644
--- a/drivers/clk/zynqmp/clkc.c
+++ b/drivers/clk/zynqmp/clkc.c
@@ -53,6 +53,10 @@
 #define RESERVED_CLK_NAME		""
 
 #define CLK_VALID_MASK			0x1
+#define NODE_CLASS_SHIFT		26U
+#define NODE_SUBCLASS_SHIFT		20U
+#define NODE_TYPE_SHIFT			14U
+#define NODE_INDEX_SHIFT		0U
 
 enum clk_type {
 	CLK_TYPE_OUTPUT,
@@ -80,6 +84,7 @@ struct clock_parent {
  * @num_nodes:		Number of nodes present in topology
  * @parent:		Parent of clock
  * @num_parents:	Number of parents of clock
+ * @clk_id:		Clock id
  */
 struct zynqmp_clock {
 	char clk_name[MAX_NAME_LEN];
@@ -89,6 +94,7 @@ struct zynqmp_clock {
 	u32 num_nodes;
 	struct clock_parent parent[MAX_PARENT];
 	u32 num_parents;
+	u32 clk_id;
 };
 
 static const char clk_type_postfix[][10] = {
@@ -396,7 +402,8 @@ static int zynqmp_clock_get_topology(u32 clk_id,
 
 	*num_nodes = 0;
 	for (j = 0; j <= MAX_NODES; j += 3) {
-		ret = zynqmp_pm_clock_get_topology(clk_id, j, pm_resp);
+		ret = zynqmp_pm_clock_get_topology(clock[clk_id].clk_id, j,
+						   pm_resp);
 		if (ret)
 			return ret;
 		ret = __zynqmp_clock_get_topology(topology, pm_resp, num_nodes);
@@ -459,7 +466,8 @@ static int zynqmp_clock_get_parents(u32 clk_id, struct clock_parent *parents,
 	*num_parents = 0;
 	do {
 		/* Get parents from firmware */
-		ret = zynqmp_pm_clock_get_parents(clk_id, j, pm_resp);
+		ret = zynqmp_pm_clock_get_parents(clock[clk_id].clk_id, j,
+						  pm_resp);
 		if (ret)
 			return ret;
 
@@ -528,13 +536,14 @@ static struct clk_hw *zynqmp_register_clk_topology(int clk_id, char *clk_name,
 						   const char **parent_names)
 {
 	int j;
-	u32 num_nodes;
+	u32 num_nodes, clk_dev_id;
 	char *clk_out = NULL;
 	struct clock_topology *nodes;
 	struct clk_hw *hw = NULL;
 
 	nodes = clock[clk_id].node;
 	num_nodes = clock[clk_id].num_nodes;
+	clk_dev_id = clock[clk_id].clk_id;
 
 	for (j = 0; j < num_nodes; j++) {
 		/*
@@ -551,13 +560,14 @@ static struct clk_hw *zynqmp_register_clk_topology(int clk_id, char *clk_name,
 		if (!clk_topology[nodes[j].type])
 			continue;
 
-		hw = (*clk_topology[nodes[j].type])(clk_out, clk_id,
+		hw = (*clk_topology[nodes[j].type])(clk_out, clk_dev_id,
 						    parent_names,
 						    num_parents,
 						    &nodes[j]);
 		if (IS_ERR(hw))
-			pr_warn_once("%s() %s register fail with %ld\n",
-				     __func__, clk_name, PTR_ERR(hw));
+			pr_warn_once("%s() 0x%x: %s register fail with %ld\n",
+				     __func__,  clk_dev_id, clk_name,
+				     PTR_ERR(hw));
 
 		parent_names[0] = clk_out;
 	}
@@ -621,20 +631,26 @@ static int zynqmp_register_clocks(struct device_node *np)
 static void zynqmp_get_clock_info(void)
 {
 	int i, ret;
-	u32 attr, type = 0;
+	u32 attr, type = 0, nodetype, subclass, class;
 
 	for (i = 0; i < clock_max_idx; i++) {
-		zynqmp_pm_clock_get_name(i, clock[i].clk_name);
-		if (!strcmp(clock[i].clk_name, RESERVED_CLK_NAME))
-			continue;
-
 		ret = zynqmp_pm_clock_get_attributes(i, &attr);
 		if (ret)
 			continue;
 
 		clock[i].valid = attr & CLK_VALID_MASK;
-		clock[i].type = attr >> CLK_TYPE_SHIFT ? CLK_TYPE_EXTERNAL :
-							CLK_TYPE_OUTPUT;
+		clock[i].type = ((attr >> CLK_TYPE_SHIFT) & 0x1) ?
+				CLK_TYPE_EXTERNAL : CLK_TYPE_OUTPUT;
+		nodetype = (attr >> NODE_TYPE_SHIFT) & 0x3F;
+		subclass = (attr >> NODE_SUBCLASS_SHIFT) & 0x3F;
+		class = (attr >> NODE_CLASS_SHIFT) & 0x3F;
+
+		clock[i].clk_id = (class << NODE_CLASS_SHIFT) |
+				  (subclass << NODE_SUBCLASS_SHIFT) |
+				  (nodetype << NODE_TYPE_SHIFT) |
+				  (i << NODE_INDEX_SHIFT);
+
+		zynqmp_pm_clock_get_name(clock[i].clk_id, clock[i].clk_name);
 	}
 
 	/* Get topology of all clock */
-- 
2.7.4