[PATCH 09/20] coresight: dts: Define new bindings for direction of data flow
From: Suzuki K Poulose
Date: Tue Jun 05 2018 - 17:47:49 EST
So far we have relied on an undocumented property "slave-mode",
to indicate if the given port is input or not. Since we are
redefining the coresight bindings, define new property for the
"direction" of data flow for a given connection endpoint in the
device.
Each endpoint must define the following property.
- "direction" : 0 => Port is input
1 => Port is output
Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
.../devicetree/bindings/arm/coresight.txt | 24 ++++++++++++++--------
drivers/hwtracing/coresight/of_coresight.c | 22 ++++++++++++++++----
2 files changed, 34 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index bf75ab3..ff382bc 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -103,9 +103,11 @@ with a specific direction of data flow, each connection must define the
following properties to uniquely identify the connection details.
* Direction of the data flow w.r.t the component :
- Each input port must have the following property defined at the "endpoint"
+ Each hardware port must have the following property defined at the "endpoint"
for the port.
- "slave-mode"
+ "direction" - 32bit integer, whose values are defined as follows :
+ 0 => the endpoint is an Input port
+ 1 => the endpoint is an Output port.
* Hardware Port number at the component:
- Each "endpoint" must define the hardware port of the local end of the
@@ -129,7 +131,7 @@ Example:
clock-names = "apb_pclk";
port {
etb_in_port: endpoint@0 {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&replicator_out_port0>;
coresight,hwid = <0>;
};
@@ -144,7 +146,7 @@ Example:
clock-names = "apb_pclk";
port {
tpiu_in_port: endpoint@0 {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&replicator_out_port1>;
coresight,hwid = <0>;
};
@@ -166,6 +168,7 @@ Example:
port@0 {
reg = <0>;
replicator_out_port0: endpoint {
+ direction = <1>;
remote-endpoint = <&etb_in_port>;
coresight,hwid = <0>;
};
@@ -174,6 +177,7 @@ Example:
port@1 {
reg = <1>;
replicator_out_port1: endpoint {
+ direction = <1>;
remote-endpoint = <&tpiu_in_port>;
coresight,hwid = <1>;
};
@@ -183,7 +187,7 @@ Example:
port@2 {
reg = <1>;
replicator_in_port0: endpoint {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&funnel_out_port0>;
coresight,hwid = <0>;
};
@@ -205,6 +209,7 @@ Example:
port@0 {
reg = <0>;
funnel_out_port0: endpoint {
+ direction = <1>;
remote-endpoint =
<&replicator_in_port0>;
coresight,hwid = <0>;
@@ -215,7 +220,7 @@ Example:
port@1 {
reg = <1>;
funnel_in_port0: endpoint {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&ptm0_out_port>;
coresight,hwid = <0>;
};
@@ -224,7 +229,7 @@ Example:
port@2 {
reg = <2>;
funnel_in_port1: endpoint {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&ptm1_out_port>;
coresight,hwid = <1>;
};
@@ -233,7 +238,7 @@ Example:
port@3 {
reg = <3>;
funnel_in_port2: endpoint {
- slave-mode;
+ direction = <0>;
remote-endpoint = <&etm0_out_port>;
coresight,hwid = <2>;
};
@@ -252,6 +257,7 @@ Example:
clock-names = "apb_pclk";
port {
ptm0_out_port: endpoint {
+ direction = <1>;
remote-endpoint = <&funnel_in_port0>;
coresight,hwid = <0>;
};
@@ -267,6 +273,7 @@ Example:
clock-names = "apb_pclk";
port {
ptm1_out_port: endpoint {
+ direction = <1>;
remote-endpoint = <&funnel_in_port1>;
coresight,hwid = <0>;
};
@@ -284,6 +291,7 @@ Example:
clock-names = "apb_pclk";
port {
stm_out_port: endpoint {
+ direction = <1>;
remote-endpoint = <&main_funnel_in_port2>;
coresight,hwid = <0>;
};
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index d23d7dd..0d6e6a9 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -45,7 +45,20 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
endpoint, of_dev_node_match);
}
-static void of_coresight_get_ports(const struct device_node *node,
+static bool of_coresight_endpoint_is_input(struct device *dev,
+ struct device_node *ep_node)
+{
+ u32 dir;
+
+ if (!of_property_read_u32(ep_node, "direction", &dir))
+ return dir == 0;
+
+ dev_warn_once(dev, "Missing mandatory \"direction\" property!\n");
+ return of_property_read_bool(ep_node, "slave-mode");
+}
+
+static void of_coresight_get_ports(struct device *dev,
+ const struct device_node *node,
int *nr_inport, int *nr_outport)
{
struct device_node *ep = NULL;
@@ -56,7 +69,7 @@ static void of_coresight_get_ports(const struct device_node *node,
if (!ep)
break;
- if (of_property_read_bool(ep, "slave-mode"))
+ if (of_coresight_endpoint_is_input(dev, ep))
in++;
else
out++;
@@ -149,7 +162,7 @@ static int of_coresight_parse_endpoint(struct device *dev,
* No need to deal with input ports, processing for as
* processing for output ports will deal with them.
*/
- if (of_find_property(ep, "slave-mode", NULL))
+ if (of_coresight_endpoint_is_input(dev, ep))
break;
/* Parse the local port details */
@@ -212,7 +225,8 @@ of_get_coresight_platform_data(struct device *dev,
pdata->cpu = of_coresight_get_cpu(node);
/* Get the number of input and output port for this component */
- of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
+ of_coresight_get_ports(dev, node,
+ &pdata->nr_inport, &pdata->nr_outport);
/* If there are not output connections, we are done */
if (!pdata->nr_outport)
--
2.7.4