linux-kernel - Re: [RFC PATCH 7/8] dts: coresight: Define new bindings for direction of data flow

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Message-ID: <20180601203928.GD9838@xps15>
Date:   Fri, 1 Jun 2018 14:39:28 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, sudeep.holla@....com,
        robh@...nel.org, mark.rutland@....com, frowand.list@...il.com,
        matt.sealey@....com, charles.garcia-tobin@....com,
        john.horley@....com, mike.leach@...aro.org,
        coresight@...ts.linaro.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 7/8] dts: coresight: Define new bindings for
 direction of data flow

On Fri, Jun 01, 2018 at 02:16:06PM +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: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/hwtracing/coresight/of_coresight.c | 20 ++++++++++++++++----

You haven't documented the binding in bindings/arm/coresight.txt the same way
you did with "coresight,hwid".  I'm guessing you simply forgot to do a "git add"
on the file when preparing the patchset.

>  1 file changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index 99d7a9c..63c1668 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -52,7 +52,19 @@ 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_ep_is_input(struct device *dev, struct device_node *ep_node)

I suggested of_coresight_endpoint_get_port_id() in my review of 6/8.  I'm good
with either "ep" or "endpoint", as long as the names are consistent.

> +{
> +	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;
> @@ -63,7 +75,7 @@ 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_ep_is_input(dev, ep))
>  			in++;
>  		else
>  			out++;
> @@ -149,7 +161,7 @@ of_get_coresight_platform_data(struct device *dev,
>  	pdata->name = dev_name(dev);
>  
>  	/* 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 (pdata->nr_outport) {
>  		ret = of_coresight_alloc_memory(dev, pdata);
> @@ -168,7 +180,7 @@ of_get_coresight_platform_data(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_ep_is_input(dev, ep))
>  				continue;
>  
>  			outport = of_graph_ep_coresight_get_port_id(dev, ep);
> -- 
> 2.7.4
>