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Date: Fri, 8 Jun 2018 15:39:25 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org, robh@...nel.org,
frowand.list@...il.com, mark.rutland@....com, sudeep.holla@....com,
arm@...nel.org, linux-kernel@...r.kernel.org, matt.sealey@....com,
john.horley@....com, charles.garcia-tobin@....com,
coresight@...ts.linaro.org, devicetree@...r.kernel.org,
mike.leach@...aro.org
Subject: Re: [PATCH 09/20] coresight: dts: Define new bindings for direction
of data flow
On Tue, Jun 05, 2018 at 10:43:20PM +0100, Suzuki K Poulose wrote:
> 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@....com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
> .../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)
For both the binding and the code:
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> --
> 2.7.4
>
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