linux-kernel - [PATCH v4 18/25] coresight: etm4x: Expose trcdevarch via trcidr

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Date:   Thu, 19 Nov 2020 16:45:40 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     mathieu.poirier@...aro.org, mike.leach@...aro.org,
        linux-kernel@...r.kernel.org, anshuman.khandual@....com,
        jonathan.zhouwen@...wei.com, coresight@...ts.linaro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v4 18/25] coresight: etm4x: Expose trcdevarch via trcidr

Expose the TRCDEVARCH register via the sysfs for component
detection. Given that the TRCIDR1 may not completely identify
the ETM component and instead need to use TRCDEVARCH, expose
this via sysfs for tools to use it for identification.

Cc: Mike Leach <mike.leach@...aro.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index 009818675928..277fd5bff811 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -2395,6 +2395,7 @@ coresight_etm4x_cross_read(trcidr10, TRCIDR10);
 coresight_etm4x_cross_read(trcidr11, TRCIDR11);
 coresight_etm4x_cross_read(trcidr12, TRCIDR12);
 coresight_etm4x_cross_read(trcidr13, TRCIDR13);
+coresight_etm4x_cross_read(trcdevarch, TRCDEVARCH);
 
 static struct attribute *coresight_etmv4_trcidr_attrs[] = {
 	&dev_attr_trcidr0.attr,
@@ -2410,6 +2411,7 @@ static struct attribute *coresight_etmv4_trcidr_attrs[] = {
 	&dev_attr_trcidr11.attr,
 	&dev_attr_trcidr12.attr,
 	&dev_attr_trcidr13.attr,
+	&dev_attr_trcdevarch.attr,
 	NULL,
 };
 
-- 
2.24.1