linux-kernel - Re: [PATCH V6 6/6] coresight: etm4x: Add ACPI support in platform driver

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Date:   Wed, 19 Jul 2023 11:11:31 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     rafael@...nel.org, Len Brown <lenb@...nel.org>
Cc:     Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
        Steve Clevenger <scclevenger@...amperecomputing.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, devicetree@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH V6 6/6] coresight: etm4x: Add ACPI support in platform
 driver

Rafael, Len

Ping (packets 6, lost 100%).


On 10/07/2023 17:40, Suzuki K Poulose wrote:
> Rafael, Len
> 
> On 10/07/2023 07:25, Anshuman Khandual wrote:
>> From: Suzuki K Poulose <suzuki.poulose@....com>
>>
>> Drop ETM4X ACPI ID from the AMBA ACPI device list, and instead just 
>> move it
>> inside the new ACPI devices list detected and used via platform driver.
>>
>> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
>> Cc: Len Brown <lenb@...nel.org>
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: Mike Leach <mike.leach@...aro.org>
>> Cc: Leo Yan <leo.yan@...aro.org>
>> Cc: Sudeep Holla <sudeep.holla@....com>
>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>> Cc: linux-acpi@...r.kernel.org
>> Cc: coresight@...ts.linaro.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-kernel@...r.kernel.org
>> Reviewed-by: Sudeep Holla <sudeep.holla@....com> (for ACPI specific 
>> changes)
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> 
> We would like to queue this via coresight tree. The acpi_amba bits have
> been reviewed by Sudeep. Please could you give us an Ack, if you are
> happy with the proposal ?
> 

Kind regards
Suzuki

> Kind regards
> Suzuki
> 
> 
>> ---
>>   drivers/acpi/acpi_amba.c                           |  1 -
>>   drivers/hwtracing/coresight/coresight-etm4x-core.c | 10 ++++++++++
>>   2 files changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
>> index f5b443ab01c2..099966cbac5a 100644
>> --- a/drivers/acpi/acpi_amba.c
>> +++ b/drivers/acpi/acpi_amba.c
>> @@ -22,7 +22,6 @@
>>   static const struct acpi_device_id amba_id_list[] = {
>>       {"ARMH0061", 0}, /* PL061 GPIO Device */
>>       {"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
>> -    {"ARMHC500", 0}, /* ARM CoreSight ETM4x */
>>       {"ARMHC501", 0}, /* ARM CoreSight ETR */
>>       {"ARMHC502", 0}, /* ARM CoreSight STM */
>>       {"ARMHC503", 0}, /* ARM CoreSight Debug */
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c 
>> b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> index 43f583987250..703b6fcbb6a5 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> @@ -3,6 +3,7 @@
>>    * Copyright (c) 2014, The Linux Foundation. All rights reserved.
>>    */
>> +#include <linux/acpi.h>
>>   #include <linux/bitops.h>
>>   #include <linux/kernel.h>
>>   #include <linux/moduleparam.h>
>> @@ -2347,12 +2348,21 @@ static const struct of_device_id 
>> etm4_sysreg_match[] = {
>>       {}
>>   };
>> +#ifdef CONFIG_ACPI
>> +static const struct acpi_device_id etm4x_acpi_ids[] = {
>> +    {"ARMHC500", 0}, /* ARM CoreSight ETM4x */
>> +    {}
>> +};
>> +MODULE_DEVICE_TABLE(acpi, etm4x_acpi_ids);
>> +#endif
>> +
>>   static struct platform_driver etm4_platform_driver = {
>>       .probe        = etm4_probe_platform_dev,
>>       .remove        = etm4_remove_platform_dev,
>>       .driver            = {
>>           .name            = "coresight-etm4x",
>>           .of_match_table        = etm4_sysreg_match,
>> +        .acpi_match_table    = ACPI_PTR(etm4x_acpi_ids),
>>           .suppress_bind_attrs    = true,
>>           .pm            = &etm4_dev_pm_ops,
>>       },
>