linux-kernel - Re: [PATCH V5 6/6] coresight: etm4x: Add ACPI support in platform driver

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Message-ID: <0327c5b6-9b6b-460a-dc7e-3a891485a9bd@arm.com>
Date:   Wed, 21 Jun 2023 18:54:29 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, rafael.j.wysocki@...el.com
Cc:     scclevenger@...amperecomputing.com,
        Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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,
        linux-arm-kernel@...ts.infradead.org,
        "anshuman.khandual@....com" <anshuman.khandual@....com>
Subject: Re: [PATCH V5 6/6] coresight: etm4x: Add ACPI support in platform
 driver

On 14/06/2023 14:52, Suzuki K Poulose wrote:
> On 06/06/2023 10:36, Suzuki K Poulose wrote:
>> Hi Rafael,
>>
>> Gentle ping.
> 
> Gentle ping..
> 

Gentle reminder, Rafael.

Suzuki

>>
>> On 30/05/2023 10:57, Suzuki K Poulose wrote:
>>> Hi Rafael
>>>
>>> On 29/05/2023 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>
>>>> ---
>>>>   drivers/acpi/acpi_amba.c                           |  1 -
>>>
>>> We would like to push this via the coresight tree. Please could you 
>>> Ack this change if you are happy with the proposal and the change ?
>>>
>>
>>
>> Suzuki
>>
> 
> Suzuki
> 
> 
>>
>>> Suzuki
>>>
>>>
>>>>   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 e10f6676dd9b..fd6f9dff5881 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>
>>>> @@ -2344,12 +2345,21 @@ 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,
>>>>       },
>>>
>>
>