linux-kernel - Re: [PATCH V2 1/7] coresight: replicator: Move ACPI support from AMBA driver to platform driver

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Date:   Mon, 4 Dec 2023 17:07:30 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     James Clark <james.clark@....com>,
        Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 1/7] coresight: replicator: Move ACPI support from AMBA
 driver to platform driver



On 12/4/23 15:27, James Clark wrote:
> 
> On 04/12/2023 04:48, Anshuman Khandual wrote:
>>
>> On 12/4/23 09:56, Anshuman Khandual wrote:
>>>
>>> On 12/1/23 18:05, Sudeep Holla wrote:
>>>> On Fri, Dec 01, 2023 at 11:50:47AM +0530, Anshuman Khandual wrote:
>>>>> Add support for the dynamic replicator device in the platform driver, which
>>>>> can then be used on ACPI based platforms. This change would now allow
>>>>> runtime power management for repliacator devices on ACPI based systems.
>>>>>
>>>>> The driver would try to enable the APB clock if available. Also, rename the
>>>>> code to reflect the fact that it now handles both static and dynamic
>>>>> replicators.
>>>>>
>>>>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>>>>> Cc: Sudeep Holla <sudeep.holla@....com>
>>>> Except the minor nit below which may apply also for few other patches
>>>> in the series
>>>>
>>>> Acked-by: Sudeep Holla <sudeep.holla@....com> # For ACPI related changes
>>>> Tested-by: Sudeep Holla <sudeep.holla@....com> # Boot and driver probe only
>>>>
>>>> [...]
>>>>
>>>>> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
>>>>> index b6be73034996..64de0bee02ec 100644
>>>>> --- a/drivers/hwtracing/coresight/coresight-replicator.c
>>>>> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
>>>>> @@ -38,6 +38,7 @@ DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
>>>>>  struct replicator_drvdata {
>>>>>  	void __iomem		*base;
>>>>>  	struct clk		*atclk;
>>>>> +	struct clk		*pclk;
>>>> [minor nit] Perhaps can be documented as well ?
>>> Sure, will add the following comment above the structure.
>>>
>>> @pclk:    optional clock for the core parts of the replicator.
>> My bad, this will be the following instead.
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
>> index 64de0bee02ec..44b9a77ec8aa 100644
>> --- a/drivers/hwtracing/coresight/coresight-replicator.c
>> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
>> @@ -31,6 +31,7 @@ DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
>>   * @base:      memory mapped base address for this component. Also indicates
>>   *             whether this one is programmable or not.
>>   * @atclk:     optional clock for the core parts of the replicator.
>> + * @pclk:      APB clock if present, otherwise NULL
>>   * @csdev:     component vitals needed by the framework
>>   * @spinlock:  serialize enable/disable operations.
>>   * @check_idfilter_val: check if the context is lost upon clock removal.
>>
>> I will update replicator, tpiu, tmc, and stm devices.
>>
> funnel is missing it as well. If you build with W=1 it shows up.

Updated, done.